- New N2O2- and N2O3-macrocycle ligands incorporating p-xylyl groups
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The synthesis and characterization of four dibenzo-substituted macrocycles incorporating mixed nitrogen and oxygen heteroatoms as well as one or two xylyl groups are reported. The X-ray structure of one product containing two xylyl functions is presented.
- Kim, Jeong,Lindoy, Leonard F.,Ahn, Tae-Ho,Choi, Gyu-Sung
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- Stereoselective synthesis of bis-β-lactam grafted macrocycles
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The synthesis of a series of macrocyclic bis-β-lactam derivatives via a highly stereoselective (2+2) cycloaddition is described.
- Arumugam, Natarajan,Raghunathan, Raghavachary
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- A comparative molecular structure – NLO activity study of ortho-bridged dibenzaldehydes: Synthesis, crystal structure, SHG, and DFT studies
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Structural and second order nonlinear optical characteristics of four ortho-bridged dibenzaldehydes with alkyloxy- and xylenyloxy linkers are compared from the XRD, UV-Vis-NIR spectroscopic, SHG, and DFT studies. Interruption of electron polarization by π
- Jothi, A. Irudaya,Paul, M. Wilson Bosco,Alexander
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- Green synthesis of novel bis(hexahydro-1H-xanthene-1,8(2H)-diones) employing p-toluenesulfonic acid (p-TSA) as a solid acid catalyst
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Green synthesis of novel bis(hexahydro-1H-xanthene-1,8(2H)-diones) which are linked to aliphatic or aromatic spacers via ether or ester linkages were performed in good to excellent yields by the reaction of 5,5-dimethyl-1,3-cyclohexanedione with the appropriate bis-aldehydes using p-TSA as an organic acid solid catalyst. The reaction of the bis-aldehydes with barbituric acid or 1,3-dimethylbarbituric acid instead of 5,5-dimethyl-1,3-cyclohexanedione afforded the corresponding Knoevenagel condensation adducts in good yield.
- Darweesh, Ahmed F.,Salama, Soad K.,Abdelhamid, Ismail A.,Elwahy, Ahmed H. M.
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p. 471 - 484
(2020/10/30)
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- Microwave assisted multi-component synthesis of novel bis(1,4-dihydropyridines) based arenes or heteroarenes
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A synthesis of novel bis-1,4-DHPs was reported. Two possible synthetic approaches for these compounds were investigated. In the first approach the monopodal 1,4-DHPs were used as building blocks for the construction of the target molecules via a simple al
- Sanad, Sherif M. H.,Kassab, Refaie M.,Abdelhamid, Ismail A.,Elwahy, Ahmed H. M.
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p. 910 - 924
(2016/07/06)
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- Ring-closing metathesis reaction-based synthesis of new classes of polyether macrocyclic systems
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Ring closing metathesis (RCM) reactions of suitable substrates having terminal olefins, which are assembled from various linkers and hydroxy benzaldehydes and syntheses of a wide range of 16-30 membered, new crown ether-type polyether, aza-polyether, bis aza-polyether macrocycles and dilactone moiety embedded polyether macrocycles (macrolides) are reported. After the ring-closure reaction, installation of different functional groups and functional group modification on the periphery of the synthesized polyether/crown ether macrocycles obtained in the RCM reactions are accomplished using the epoxidation, oxidation and catalytic hydrogenation-based synthetic transformations. Along this line, the syntheses of a variety of polyether macrocycles possessing epoxide or α-hydroxy ketone or 1,2-diol functionalities at the periphery have been shown. Furthermore, the synthesized α-hydroxy ketone functionality installed polyether macrocycles were subjected to the allylation and Reformatsky type reactions to obtain homoallyl alcohol moiety-based and lactone ring-appended polyether macrocycles.
- Naveen,Babu, Srinivasarao Arulananda
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supporting information
p. 7758 - 7781
(2015/09/08)
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- Synthesis and antimicrobial studies of new N,N'-[5,5'-{2,2'-(bis-alkoxy) bis(2,1-phenylene)]bis(4-acetyl-4,5-dihydro-1,3,4-thiadiazole-5, 2-diyl)]diacetamide
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The bisthiadiazolines 4a(a'-f ') and 4b(a'-f ') built around the various rigid chains have been synthesized in good yields by refluxing bisthiosemicarbazones 3a(a'-f ') and 3b(a'-f ') in acetic anhydride medium. The reaction of bisaldehydes 2a(a'-f ') and
- Yusuf, Mohamad,Solanki, Indu,Jain, Payal
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experimental part
p. 703 - 715
(2012/09/07)
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- Synthesis of novel amide-crownophanes and Schiff base-crownophanes based on p-phenylene, 2,6-naphthalene, and 9,10-anthracene
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(Chemical Equation Presented) The novel macrocyclic diamides 11-13, 16-18 are obtained in 45-66% yields by the reaction of dipotassium salts 10a-c and 15 with each of 1,4-di(bromomethyl)benzene 4, 2,6-di(bromomethyl)naphthalene 6 and 9,10-di(bromomethyl)anthracene 8, repectively, in boiling DMF. On the other hand, the new macrocyclic Schiff bases 28 and 29 are obtained in 44% and 42% yields by heating the appropriate bis-amines 25b, 26b with the corresponding bis-aldehydes 21, 22, respectively, in refluxing acetic acid under high-dilution conditions.
- Muathen, Hussni A.,Aloweiny, Nour A. M.,Elwahy, Ahmed H. M.
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experimental part
p. 656 - 663
(2009/12/01)
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- Short-chain Basket Handle Porphyrins: Synthesis and Characterisation
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Basket handle porphyrins containing short p- or m-phenylenedimethylenedioxy chains covalently linked at the ortho position of phenyl groups of 5,10,15,20-tetraphenylporphyrin have been synthesised.Isomer I of the para derivative (H2LIa) and iso
- Reddy, Damodar,Chandrashekar, Tavarekere K.
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p. 619 - 626
(2007/10/02)
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