- Facile protection of carbonyl compounds as oxathiolanes and thioacetals promoted by PEG1000-based dicationic acidic ionic liquid as chemoselective and recyclable catalyst
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Efficient oxathioacetalization and thioacetalization of carbonyl compounds have been achieved in high yields employing PEG1000-based dicationic acidic ionic liquid as a catalyst. The PEG ionic liquid and toluene have the advantages of both homo
- Ren, Yi-Ming,Shao, Juan-Juan,Wu, Zhi-Chuan,Zhang, Shuai,Tao, Ting-Xian
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p. 392 - 394
(2014/06/09)
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- Nickel(II) chloride hexahydrate catalyzed reaction of aromatic aldehydes with 2-mercaptoethanol: Formation of supramolecular helical assemblage of the product
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Various aromatic aldehydes on reaction with 2-mercaptoethanol provided an unanticipated product, bis(2-hydroxyethyl)dithioacetals (3) as the major product along with the expected product 1,3-oxathiolanes (4) in the presence of 0.05 equiv amount of nickel(
- Laskar, Rajibul A.,Begum, Naznin A.,Mir, Mohammad Hedayetullah,Rohman, Md. Rumum,Khan, Abu T.
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p. 5839 - 5844
(2013/10/21)
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- Efficient procedure for oxathioacetalization using the novel ionic liquid
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The novel ionic liquid with multi-SO3H groups has been synthesized through the simple procedure and its catalytic activity for the oxathioacetalization was investigated carefully at room temperature under solvent-free condition. The results sho
- Bao, Shaohua,Chen, Lu,Ji, Yongjun,Yang, Jianguo
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experimental part
p. 2119 - 2122
(2011/10/03)
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- An efficient and chemoselective method for conversion of carbonyl compounds to 1,3-oxathiolanes with 2-mercaptoethanol catalyzed by TiCl 4-montmorillonite
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Formation of 1,3-oxathiolanes from aldehydes and ketones using 2-mercaptoethanol in the presence of TiCl4-montmorillonite under mild reaction conditions in excellent yields is described. Chemoselective monothioacetalization of aldehyde in the p
- Jin, Tong-Shou,Zhao, Rui-Qiao,Ma, Yan-Ran,Yang, Mi-Na,Guo, Jun-Jie,Li, Tong-Shuang
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p. 503 - 505
(2007/10/03)
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- Tantalum(V) chloride-silica gel: An efficient catalyst for conversion of carbonyl compounds to 1,3-oxathiolanes
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A variety of carbonyl compounds can be easily converted to the corresponding 1,3-oxathiolanes in the presence of a catalytic amount of tantalum(V) chloride [TaCl5] on silica gel in dichloromethane. Mild reaction conditions, efficiency, high yie
- Chandrasekhar,Prakash, S. Jaya,Shyamsunder,Ramachandar
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p. 3127 - 3131
(2007/10/03)
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- Organic reactions in aqueous media: I2-in-water-catalysed rapid and chemoselective oxathioacetalisation of aldehydes under mild conditions
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I2 in water is found to be an efficient catalyst for the chemoselective protection of both aliphatic and aromatic aldehydes as 1,3-oxathioacetals under mild conditions. Fast reactions and excellent yields of pure products using an inexpensive a
- Bandgar,Bettigeri, Sampada V.
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p. 389 - 391
(2007/10/03)
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- Deprotection of 1,3-oxathiolanes to carbonyl compounds with montmorillonite K10
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Montmorillonite K10 has been used in the deprotection of different aromatic and aliphatic 1,3-oxathiolanes to the corresponding carbonyl compounds in 73 to 97% yields under mild and environmentally compatible conditions.
- Chauhan,Kumar, Anil,Sahoo
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p. 2635 - 2637
(2007/10/03)
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- Scandium(III) Triflate as an Efficient and Recyclable Catalyst for Chemoselective Conversion of Carbonyl Compounds to 1,3-Oxathiolanes
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A variety of carbonyl compounds can be easily and rapidly converted to the corresponding 1,3-oxathiolanes in the presence of a catalytic amount of scandium(III) triflate [Sc(OTf)3] in CH2Cl2. After completion of the reacti
- Karimi, Babak,Ma'mani, Leila
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p. 2503 - 2506
(2007/10/03)
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- Zirconium tetrachloride (ZrCl4) as an efficient and chemoselective catalyst for conversion of carbonyl compounds to 1,3-oxathiolanes
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Different types of aldehydes and ketones can be efficiently converted into their corresponding 1,3-oxathiolanes using 2-mercaptoethanol (1.5-3.2 equiv.) in the presence of catalytic amount (0.04-0.15 equiv.) of ZrCl4 in CH2Cl2/
- Karimi, Babak,Seradj, Hassan
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p. 805 - 806
(2007/10/03)
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- ACTIVITY OF 1-OXA-3-THIACYCLOALKANES AND 2-ALKYLTHIOOXACYCLANES IN FREE-RADICAL ISOMERIZATION
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It was established that radical isomerization to alkyl esters of thiocarboxylic acids, initiated by tert-butyl peroxide at 130-150 deg C, is a common reaction for five-, six- and seven-membered 1-oxa-3-thiacycloalkanes and 2-alkylthiooxacycloalkanes.Under analogous conditions 2-diethylaminotetrahydropyran isomerizes to N,N-diethylvaleramide.The relation between the structure and the reactivity of 1-oxa-3-thiacycloalkanes and 2-alkylthiooxacycloalkanes in free-radical isomerisation was studied by the method of competing reactions.Depending on the ring size, the activity of the 1-oxa-3-thiacycloalkanes increases in the order : 1,3-oxathianes 1,3-oxathiolanes 1,3-oxathiepanes.
- Zorin, V. V.,Batyrbaev, N. A.,Zlot-skii, S. S.,Rakhmankulov, D. L.
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p. 347 - 352
(2007/10/02)
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- The Reaction of 2-Ethoxy-1,3-oxathiolane with Carbonyl Compounds in the Presence of ZnCl2 or HgCl2
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In the reaction of 2-ethoxy-1,3-oxathiolane with carbonyl compounds in the presence of ZnCl2 or HgCl2, it has been found that only the breaking of the endocyclic bond (C-O or C-S bond) occurs, while the breaking of the exocyclic C-O bond to give the 1,3-o
- Tanimoto, Shigeo,Jo, Shigeo,Sugimoto, Toyonari,Okano, Masaya
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p. 3237 - 3238
(2007/10/02)
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