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Antihyperglycemic activity of 2-methyl-3,4,5-triaryl-1H-pyrroles in SLM and STZ models
Various 3,4,5-triarylpyrroles were synthesized and evaluated for their in vivo antihyperglycemic activity in sucrose-loaded (SLM) and/or streptozotocin-induced (STZ) diabetic rat models. Three of the test compounds, 2-methyl-4,5-diphenyl-3-substituted-phe
Goel, Atul,Agarwal, Nidhi,Singh, Fateh V.,Sharon, Ashoke,Tiwari, Priti,Dixit, Manish,Pratap, Ramendra,Srivastava, Arvind K.,Maulik, Prakas R.,Ram, Vishnu J.
p. 1089 - 1092
(2004)
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Rotation Restricted Emission and Antenna Effect in Single Metal-Organic Frameworks
Aggregation induced-emission (AIE) and antenna effects are important luminescence behaviors. Thus, investigating their emission mechanisms and revealing their behaviors have become critical but challenging. Here we design and prepare metal-organic framewo
Yin, Hua-Qing,Wang, Xin-Yao,Yin, Xue-Bo
supporting information
p. 15166 - 15173
(2019/10/19)

Experimental and computational study of metal-free Br?nsted acidic ionic liquid catalyzed benzylic C(sp3)–H bond activation and C–N, C–C cross couplings
Metal and solvent free synthesis of tetrasubstituted imidazoles and tetrasubstituted pyrazines from 1,2-diketones and aliphatic amines is studied experimentally and computationally. Various ionic liquids (ILs) are taken as a catalyst in 10 mol% for the re
Valiyev, Isa,Abdullayev, Yusif,Yagubova, Sevinj,Baybekov, Shamkhal,Salmanov, Cavanshir,Autschbach, Jochen
p. 410 - 419
(2019/03/06)

One-pot synthesis of 2,3,5-substituted 1H-pyrroles via the reaction of terminal acetylenes with nitriles and EtAlCl2 catalyzed by Сp2TiCl2
A new one pot method for the synthesis of 2,3,5-substituted 1H-pyrroles in moderate to good yields (58–77%) based on multicomponent reaction of terminal acetylenes with nitriles and EtAlCl2 in the presence of Сp2TiCl2 cata
Khafizova, Leila O.,Shaibakova, Mariya G.,Rikhter, Nikita A.,Tyumkina, Tatyana V.,Dzhemilev, Usein M.
p. 906 - 911
(2019/01/11)

Four-phenyl pyrazine small molecule derivatives, four-phenyl pyrazine polymer and aggregation induced material
The invention discloses a tetrapherylpyrazine low-molecular-weight derivate, a tetrapherylpyrazine polymer and an aggregation-induced emission material. The tetrapherylpyrazine low-molecular-weight derivate is of a structure as shown in a formula (1), whe
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Paragraph 0070-0075

(2017/08/14)

Phosphine Supported Ruthenium Nanoparticle Catalyzed Synthesis of Substituted Pyrazines and Imidazoles from α-Diketones
A new methodology has been developed for the synthesis of highly substituted nitrogen heterocycles such as pyrazines and imidazoles starting from α-diketones using phosphine supported ruthenium nanoparticles (RuNPs) as catalysts. Ruthenium nanoparticles Ru1-Ru4 supported with different phosphines such as dbdocphos, dppp, DPEphos, and Xantphos are screened, of which Ru1 and Ru4 are found to be the most active. Interestingly, aryl-substituted and alkyl-substituted α-diketones produced different products: namely, pyrazine and imidazoles, respectively. This reaction methodology has been applied to the synthesis of a key intermediate (2m) of the marine cytotoxic natural product Dragmacidin B and an estrogen receptor (2l). This work represents the first examples of pyrazines prepared by RuNPs.
Ganji, Prasad,Van Leeuwen, Piet W. N. M.
p. 1768 - 1774
(2017/02/10)

Combining photo-cleavable and hydrogen-abstracting groups in quinoxaline with thioether bond as hybrid photoinitiator
We synthesized four diphenylquinoxaline derivatives (SQs) with phenyl-thioether units, which combine photo-cleavable and hydrogen-abstracting groups in one molecule. The photochemistry and photopolymerization of SQs were investigated. SQs possess suitable
Yao, Ji-Yuan,Hou, Hong-Hao,Ma, Xiao-Dong,Xu, Hong-Jie,Shi, Zi-Xing,Yin, Jie,Jiang, Xue-Song
p. 6 - 12
(2017/01/13)

SnCl2·2H2O-Catalyzed Solvent-Free Synthesis of α-Amino Ketones and Tetrasubstituted Pyrazines
Solvent-free reaction of various anilines with α-hydroxy ketones catalyzed by SnCl2·2H2O provides α-amino ketones in excellent yields. While a similar reaction with aliphatic amines is applicable for the synthesis of substituted pyrazines, SnCl2·2H2O permits versatility in the solvent-free reaction of α-hydroxy ketones with ammonium acetate to give the corresponding substituted pyrazines in good to excellent yields.
Tamaddon, Fatemeh,Dehghani Tafti, Arefeh
p. 2217 - 2220
(2016/10/11)

An Improved Synthesis of Multi-Substituted Pyrazines under Catalyst- and Solvent-Free Conditions
A one-pot pseudo four-component reaction between a variety of 2-hydroxy-1,2-diarylethanone derivatives and ammonium acetate or amines has been developed to synthesize substituted pyrazines under catalyst-free and solvent-free conditions. This procedure provides a synthetic method to access pyrazine derivatives in excellent yields under green conditions.
Tamaddon, Fatemeh,Tafti, Arefeh Dehghani,Pooramini, Farzaneh
p. 4295 - 4299
(2016/11/26)

Cocamidopropyl betaine catalyzed benzoin condensation and pseudo-four-component reaction of the in situ formed benzoin in water
An improved synthesis of benzoins, as key synthetic building blocks, and substituted pyrroles in micelle medium using a very small amount of cocamidopropyl betaine in water is described. In this one-pot strategy, benzoin condensation of aldehydes and further pseudo-four-component reaction of the in situ formed benzoin with 1,3-dicarbonyls, and ammonium acetate gave excellent yields of the desired pyrrole products.
Tamaddon, Fatemeh,Alizadeh, Masoomeh
p. 525 - 530
(2015/04/14)

Tetraphenylpyrazine-based AIEgens: Facile preparation and tunable light emission
Research on aggregation-induced emission (AIE) has been a hot topic. Due to enthusiastic efforts by many researchers, hundreds of AIE luminogens (AIEgens) have been generated which were mainly based on archetypal silole, tetraphenylethene, distyrylanthrac
Chen, Ming,Li, Lingzhi,Nie, Han,Tong, Jiaqi,Yan, Lulin,Xu, Bin,Sun, Jing Zhi,Tian, Wenjing,Zhao, Zujin,Qin, Anjun,Tang, Ben Zhong
p. 1932 - 1937
(2015/07/01)

Synthesis of tetraaryl- and tetraalkenylpyrazines by Suzuki-Miyaura reactions of tetrachloropyrazine
The first Suzuki-Miyaura reactions of tetrachloropyrazine allowed for a new and convenient approach to synthesize a variety of tetraarylpyrazines and tetraalkenylpyrazines, which were isolated in good to excellent yields. The products show strong fluoresc
Petrosyan, Andranik,Ehlers, Peter,Reimann, Sebastian,Ghochikyan, Tariel V.,Saghyan, Ashot S.,Spannenberg, Anke,Lochbrunner, Stefan,Langer, Peter
supporting information
p. 6803 - 6812
(2015/08/24)

Metal chloride hydrates as lewis acid catalysts in multicomponent synthesis of 2,4,5-triarylimidazoles or 2,4,5-triaryloxazoles
A series of nine metal chloride hydrates (ZnCl2.2H2O, SnCl2.2H2O, CdCl2.2H2O, MnCl 2.4H2O, CoCl2.6H2O, SrCl 2.6H2O, NiCl2.6H2O, CrCl 3.6H2O and CeCl3.7H2O) was investigated as mild and inexpensive Lewis acid catalysts to promote the multicomponent synthesis of triarylimidazoles. Reactions starting from benzil showed the best results when SnCl2.2H2O was used, while for benzoin as the starting material, CeCl3.7H2O was more efficient. All reactions were performed in EtOH as solvent. These catalysts were also successfully employed in the synthesis of triaryloxazoles.
Marques, Marcelo V.,Ruthner, Marcelo M.,Fontoura, Luiz A. M.,Russowsky, Dennis
scheme or table
p. 171 - 179
(2012/03/26)

Europium triflate-catalyzed one-pot synthesis of 2,4,5-trisubstituted-1H- imidazoles via a three-component condensation
A simple, efficient, and practical procedure for synthesis of 2,4,5-trisubstituted-1H-imidazoles via the condensation of benzoin or acetoin, aromatic aldehydes, and ammonium acetate using europium triflate [Eu(OTf)3] as a novel catalyst in high yields is described. The catalyst can be recovered conveniently and reused at least four times without any loss of activity. Copyright Taylor & Francis Group, LLC.
Yu, Chuanming,Lei, Min,Su, Weike,Xie, Yuanyuan
p. 3301 - 3309
(2008/02/12)

Synthesis and investigation of mass spectra of some nitrogen heterocycles
2,3-DIPHENYL-1, 2-dihydro-quinoxaline (2), 2, 3-diphenyl-quinoxaline (3) and 2, 3-diphenyl-1, 2, 3, 4-tetrahydroquinoxaline (4) were prepared via the reaction of benzoin with o-phenylene diamine under different reaction conditions. Acylation of 2 and 4 with acetic anhydride yielded the corresponding N-acetyl (5) and N, N-1, 4-diacetyl derivative (7), respectively. Bromination of 2 with bromine gave the corresponding 6, 7-dibromo-2,3- diphenyl-quinoxaline (6). 2, 3, 5, 6-tetraphenylpyrazine (8) and 1-(benzylidene) amino-4, 5-diphenyl-1,5-dihydro-imidazoldine-2-thione (9) were synthesized by treatment of benzoin (1) with thiourea and benzaldehyde-thiosemicarbazone. The electron impact mass spectra of both of the above series of compounds have also been recorded and their fragmentation pattern is discussed.
Hasanen,Ibrahim
experimental part
p. 337 - 351
(2009/09/06)

Reactions of 3-substituted 5-arylmethylene-1,3-thiazolidin-2,4-diones with azide and cyanide ions
3-substituted-5-arylmethylene-1,3-thiazolidine-2,4-diones 3a-e react- ed with sodium azide to afford pyrazolinone derivatives 8a-d as well as 5-(4-chlorophenylmethylene)-1,3-thiazolidine-2,4-dione 7a in the case of 3d and 5-(4-methoxyphenylmethylene-1,3-t
Youssef, Ahmed Said Ahmed
p. 1335 - 1349
(2008/02/11)

Reactions of benzonitrile with diiodides of neodymium, dysprosium, and thulium
The reactions of LnI2 (Ln = Nd, Dy, Tm) with benzonitrile are accompanied by disproportionation, resulting in the formation of triiodides LnI3(PhCN)4 and an intractable mixture of monoiodine derivatives LnI(R)R". Hydrolysis of the mixture gives 2,4,6-triphenyl-1,3, 5-tiazine, 2,3,5,6-thetraphenyl-1,4-pyrazine, and 2,4,5-triphenylimidazole. The reaction of dysprosium diiodide with acrylonitrile gives a metal-containing polymer with a molecular weight of 2700. Treatment of the polymer with water results in separation of DyI2(OH)(H2O)x to give metal-free polyacrylonitrile with a molecular weight of 2400.
Balashova,Khoroshenkov,Kusyaev,Eremenko,Aleksandrov,Fukin,Bochkarev
p. 825 - 829
(2007/10/03)

2-methyl-1,4,5-triphenyl-1H-imidazole
In 2-methyl-1,4,5-triphenyl-1H-imidazole, C22H18N2, the three substituent phenyl groups are not delocalized with the imidazole moiety; the dihedral angles these phenyl groups form with the imidazole ring are in the range 2
Vazquez Garcia, Rosa A.,Bernes, Sylvain,Gutierrez Perez, Rene,Martinez Garcia, Marcos
p. o619-o620
(2007/10/03)

Novel syntheses of polysubstituted pyrroles and oxazoles by 1,3-dipolar cycloaddition reactions of benzotriazole-stabilized nitrile ylides
1,3-Dipolar cycloadditions of benzotriazole-stabilized nitrile ylides with benzyl α,β-unsaturated-carboxylates and aldehydes as dipolarophiles proceeded smoothly and efficiently to give polysubstituted pyrroles and oxazoles, respectively, in good yields.
Katritzky, Alan R.,Zhang, Suoming,Wang, Mingyi,Kolb, Hartmuth C.,Steel, Peter J.
p. 759 - 765
(2007/10/03)

Dimorphism of 2,3,5,6-tetraphenylpyrazine
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Bartnik, Romuald,Faure, Rene,Gebicki, Krzysztof
p. 1034 - 1037
(2007/10/03)

LDA-promoted decomposition of benzenesulfenamides. A route to aminyl radicals by dioxygen oxidation of lithium amides
The LDA-promoted decomposition of N-monosubstituted sulfenamides 1a-d occurs through the formation of thioaminyl anions, which undergo oxidation either at sulfur, with formation of sulfonamides, or at nitrogen, with formation of thioaminyl radicals, depending on the nature of the 4'-substituent. The reaction of N,N-disubstituted sulfenamides 1e-h proceeds through the intermediacy of a lithium complex capable of generating aminyl radicals via sulfenyl group transfer to the di-iso-propylamido anion and subsequent aerial oxidation of the resulting lithium amides 3e-h.
Barbieri, Anna,Montevecchi, Pier Carlo,Nanni, Daniele,Navacchia, Maria Luisa
p. 13255 - 13264
(2007/10/03)

Reactions of nitrile ylids with olefins gem-substituted with withdrawing groups
In this study of 1,3-dipolar cycloadditions of nitrile ylids to olefin gem-substituted with withdrawing groups we have attempted to bring out the factors governing the diastereoselectivity of the reaction.Extensive studies have been made with allylic dipoles but few with propargyl dipoles.These reactions lead to stable pyrrol-1-ines in good yields. The adducts have been epimerized and, according to the method of generation of nitrile ylids, the isomerization of the dipoles or the dipolarophiles may occur. These facts have complicated the determination of the kinetic products.Owing to these difficulties, no interpretation of the results with perturbation theory has been attempted. - Keywords: stereochemistry / cycloaddition / 1,3-dipole / nitrile ylid / 1H-azirine / pyrrol-1-ine
Perrocheau, Jacques,Danion-Bougot, Renee,Carrie, Robert
p. 973 - 985
(2007/10/02)

A CONVENIENT AND NOVEL ONE-POT SYNTHESIS OF 3-OXO-P-1,5,3-DIAZAPHOSPHEPINES AND 3-THIOXO-P-1,5,3-DIAZAPHOSPHEPINES
In a convenient one-pot sequence, treatment of benzil-dibenzylimine with sodium in dry tetrahydrofuran followed by addition of phosphorodichloridate and phosphorothiodichloridate yields 3-oxo-P-1,5,3-diazaphosphepines and 3-thioxo-P-1,5,3-diazaphosphepines, respectively. Key Words: Benzyl dibenzylimine; phosphorodichloridate; phosphorothiodichloridate; diazaphosphepines; spectral studies.
Singh, M. S.,Rao, R. J.
p. 115 - 118
(2007/10/02)

OXAZOLONES. PART VI. REACTION OF 5(4H)-OXAZOLONES WITH NITRILE IMINES: SYNTHESIS OF 1H-1,2,4-TRIAZOLES THROUGH CYCLOADDITION
5(4H)-Oxazolones (1) react as dipolarophiles in cycloadditions with nitrile imines generated from tetrazoles (2) in refluxing anisole affording two 1H-1,2,4-triazole derivatives (3) and diarylethylenes (4).
Gelmi, Maria Luisa,Pocar, Donato,Riva, Raul
p. 315 - 320
(2007/10/02)

UREAS IN ORGANIC SYNTHESIS. V. REACTIONS OF AROMATIC KETONES AND 1,2-DIKETONES WITH UREAS IN FORMIC ACID
Urea in formic acid is a general and practical reagent for the reductive aminoformylation of benzophenones and fluoren-9-one in the synthesis of N-diarylmethylformamides, which exhibit antispasmodic activity.With benzophenone in formic acid 1,3-dimethylurea gives a high yield of N-methyl-N-benzhydrylformamide.Urea reacts selectively with benzil and benzoin, forming both the bicyclic bisurea and monocyclic nitrogen-containing heterocycles, depending on the temperature.It was proposed for the first time to use arylmethylenebisureas as reagents in reaction with benzil for the production of 1,5-diphenyl-2,4,6,8-tetraazabicyclooctane-3,7-dione or 2,4,5-triphenylimidazole.
Bakibaev, A.A.,Yagovkin, A.Yu.,Filimonov, V.D.
p. 1326 - 1331
(2007/10/02)

Electron transfer reactions. Reaction of nitrogen heterocycles with potassium
The results of our studies on potassium-induced transformations of some selected nitrogen heterocycles are presented.The substrates under investigation include 2,3-diphenylindole (1a), 2,3-diphenyl-1-methylindole (1b), 1,2,3-triphenylindole (1c), 2,3,4,5-tetraphenylpyrrole (5a), 1,2,3,5-tetraphenylpyrrole (5b), 1-benzyl-2,3,5-triphenylpyrrole (5c), 2,4,5-triphenyloxazole (15a), 4,5-diphenyl-2-methyloxazole (15b), 2,4-diphenyl-5-methyloxazole (15c), and 2,4,5-triphenylimidazole (19).Treatment of 1a with potassium in THF gave 9H-dibenzocarbazole (3a), whereas 1c gave a mixture of 9-phenyl-9H-dibenzocarbazole (3c) and 2,3-diphenylindole (1a).Under identical conditions, 1b gave only the cleavage product 1a.In contrast, when the reactions of 1a,c were carried out with potassium in THF saturated with oxygen, and with potassium superoxide in benzene containing 18-crown-6, a mixture of 2-benzamidobenzophenone (4a), the carbazoles 3a,c, and 1a was formed.Although no product was isolated on treatment of 5a with potassium in THF, the reaction of 5a with potassium in THF saturated with oxygen gave a mixture of tetraphenylpyrazine (7a), the benzoylaminostilbene 8a, the lactam 12a, benzamide (11a), and benzoic acid (14).Similar results were obtained in the reaction of 5a with potassium superoxide.The reaction of N-substituted pyrroles such as 5b,c with potassium gave the NH pyrrole 9b in each case, whereas the reaction of 5b,c with potassium in THF, saturated with oxygen, gave a mixture of 9b, the butanone 10b, the 1,4-dione 13b, the lactam 12b, the amides 11a-c, and benzoic acid (14).Attempted reactions of 5b,c with potassium superoxide did not give any isolable product; most of the starting material could be recovered unchanged in each case.A mixture of N-(1,2-diphenylethyl)benzamide (18a) and benzoic acid (14) was formed in the reaction of the oxazole 15a with potassium, whereas 15b,c, under analogous conditions, gave the N-vinylamides 17b,c and benzoic acid (14).In contrast, treatment of the imidazole 19 with potassium in THF did not give any product; however, when the reaction of 19 was carried out with potassium in THF saturated with oxygen, and with potassium superoxide, dibenzamide (21) was isolated, in each case.Radical ions have been invoked as intermediates in the transformation of the different substrates to the observed products.Cyclic voltammetric studies have been carried out to measure the reduction potentials of these radical anion intermediates.These radical anions have also been generated by pulse radiolysis in methanol, and their absorption spectra recorded.
Muneer, Mohammed,Kamat, Prashant V.,George, Manapurathu V.
p. 969 - 975
(2007/10/02)

Electron transfer reactions. Reaction of Δ2-oxazoline-5-ones and related substrates with potassium
The reaction of several Δ2-oxazolin-5-ones (1a-c, 12) and bioxazolinones (17, 26) with potassium in THF has been investigated.Treatment of 1a with potassium in THF gave a mixture of dibenzamide (11a), N-benzoyl-C-phenylglycine (6a), and C-phenylglycine (10a).A higher yield of 11a was obtained, together with benzoic acid (9), when the reaction of 1a wascarried out in THF saturated with oxygen.The reaction of 1b gave a mixture of β-phenylalanine (10b) and 9, whereas 1c gave a mixture of N-benzoyl-C,C-diphenylglycine (6c) and N-benzoyl-C,C-diphenylmethylamine (5c).Similarly, the reaction of 12 gave a mixture of α-benzamidocinnamic ac id (15) and 9.The reaction of the bioxazolinone 17 with potassium gave a mixture of 11a, 6a, and 10a, along with an appreciable yield of 2,3,5,6-tetraphenylpyrazine (25), whereas 26 under analogous conditions gave a mixture of 15, 6b, and benzamide (29).Reasonable mechanisms, involving the initial formation of radical anion intermediates and their subsequent transformation to give the observed products, have been suggested.Potassium superoxide oxidation of some of these substrates gives similar product mixtures.Cyclic voltammetric studies have been carried out to measure the reduction potentials of 1a-c, 12, 17, and 26 in the generation of their radical anions.The radical anions of these substrates were also generated pulse radiolytically in methanol and their spectra showed absorption maxima in the region 295-350 nm.
Muneer, Mohammed,Tikare, Ravindra K.,Kamat, Prashant V.,George, Manapurathu V.
p. 1624 - 1630
(2007/10/02)

Electron transfer reactions. Reaction of nitrones with potassium
Treatment of nitrones (1a-d, 26a,b, 34, 49) with potassium in tetrahydrofuran (THF) gives rise to radical anion (2a-d, 27a,b, 35, 50) and dianion intermediates (3a-d, 28a,b, 36) through electron transfer reactions.These intermediates undergo further transformations to give a variety of products.Thus, the aldehydonitrones (1a-d) give the corresponding aldehydes (10a-c), carboxylic acids (25a-c), and azobenzenes (19a,d), whereas the ketonitrones (26a,b) give deoxygenation products (31a,b).The nitrone 34 gave a mixture of products consisting of benzoic acid (25a), dibenzyl (48), the dimeric product 38, and tetraphenylpyrazine (46), whereas 49 did not give any isolable product.Cyclic voltammetric studies have been employed to measure the reduction potentials for both one-electron and two-electron transfer processes, leading to the radical anions and dianions respectively.These intermediates have been characterized through their electronic spectra and they were quenched by oxygen.Pulse radiolysis of the nitrones 1a-d, 26a,b, 34, and 49 also gave the corresponding radical anions 2a-d, 27a,b, 35, and 50, characterized by their spectra.
Ashok, Konda,Scaria, Pallikkaparambil M.,Kamat, Prashant V.,George, Manapurathu V.
p. 2039 - 2049
(2007/10/02)

4,5-DIPHENYLIMIDAZOLES FROM THE CYCLIZATION OF BENZIL N-ALKYLMONOHYDRAZONES
The thermal cyclization of monodisubstituted hydrazones (1) affords the corresponding N-substituted-4,5-diphenylimidazoles in good to excellent yields; possible mechanisms for this unusual cyclization are presented.
Collibee, William L.,Anselme, Jean-Pierre
p. 655 - 662
(2007/10/02)

Hydrazidines, IV. - Reaction of Hydrazidines with 1,2-Bifunctional Compounds
Hydrazide hydrazones 1 react with 1,2-bifunctional compounds (2, 21, 23, 26, 30, 32) to give preferentially 4-amino-1,2,4-triazines (9, 13, 22, 25, 27, 31, 35).Some reactions of these substances are described.
Neunhoeffer, Hans,Koehler, Gernot,Degen, Hans-Juergen
p. 78 - 89
(2007/10/02)

Quaternary Salts of 2H-Imidazoles
Treatment of the 4,5-diphenyl-2H-imidazoles (1a-e) with alkyl iodides gives novel 1H+,2H-imidazolium salts (2) and (3).The metho-salt (2) N-methyl protons are readily exchanged for deuterium, and anions formed by the action of base give, with m
Katritzky, Alan R.,Borja, Susana Bravo,Marquet, Jorge,Sammes, Michael P.
p. 2065 - 2069
(2007/10/02)

A New Synthesis of Pyrazines
The reaction of 1,2-diaryl-N,N'-dibenzylideneethylenediamines with sodium in dry ether followed by bubbling oxygen through reaction mixture affords 2,3,5,6-tetraarylpyrazines in high yields.
Joshi, S. C.,Mehrotra, K. N.
p. 396 - 397
(2007/10/02)

Transition Metal Catalyzed Addition Reactions of 3-Phenyl-2H-azirines and Alkyl Acetylene Carboxylates
In the presence of molybdenum hexacarbonyl, the 3-phenyl-2H-azirines 1 and 7 react with alkyl acetylene carboxylates 2 via the cleavage of the C,N-double bond to give 2H-pyrroles 5 or pyrrole 9 (Table), whose structures were deduced from the spectra data,
Inada, Akira,Heimgartner, Heinz
p. 1489 - 1498
(2007/10/02)

CHLOROAZIRINES - CONVERSION TO AZACYCLOPROPENIUM CATIONS AZIDOAZIRINES AND BIAZIRINES
Chloroazirines ionise readily but the derived azacyclopropenium ions cannot be observed directly; attempted conversion to biazirines gives the pyrazine and pyrimidine and reaction with azide ion leads to alkynes and nitriles via labile azidoazirines.
Gallagher, T. C.,Storr, R. C.
p. 2905 - 2908
(2007/10/02)

New Synthetic Method for 1,3,4,5-Tetraaryl-2-thioxo-(or -oxo)-2,3-dihydroimidazoles
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Mehrotra, K. N.,Singh, Geeta
p. 1001 - 1004
(2007/10/02)

Some derivatives of benzoin
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Mendel,Lillquist
p. 617 - 619
(2007/10/04)

Manufacture of pyrazines
Pyrazines are manufactured by reaction of nitrooxiranes with ammonia. The products are starting materials for the manufacture of dyes, fungicides and pharmaceuticals.
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(2008/06/13)