- Trichloroisocyanuric acid as a mild and efficient catalyst for thioacetalization and transthio-acetalization reactions
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Trichloroisocyanuric acid (1), a cheap industrial chemical, catalyzes mild and efficient thioacetalization and transthioacetalization reactions. In addition, this catalyst is very selective for this purpose.
- Firouzabadi,Iranpoor,Hazarkhani
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p. 1641 - 1643
(2007/10/03)
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- Selective Transdithioacetalization of Acetals, Ketals, Oxathioacetals and Oxathioketals Catalyzed by Envirocat EPZ10 R
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Envirocat EPZ10R has been found to be a remarkable reusable heterogeneous catalyst for selective transdithioacetalization of acetals, ketals, oxathioacetals and oxathioketals with HSCH2CH2SH and HSCH2CH2/s
- Gajare,Shingare,Bandgar
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p. 452 - 453
(2007/10/03)
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- Ecofriendly fast batch synthesis of dioxolanes, dithiolanes, and oxathiolanes without solvent under microwave irradiation
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2,2-Dimethoxypropane and 3,3-dimethoxypentane react with 1,2-ethanediol, thio, and oxathio analogues to give the corresponding protected carbonyls in high yield under mild solvent-free conditions. These environmentally benign conditions under microwave irradiation are applied to a large-scale synthesis.
- Perio, Bertrand,Dozias, Marie-Joelle,Hamelin, Jack
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p. 428 - 430
(2013/09/08)
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- Chemoselective Protection of Aldehydes as Dithioacetals in Lithium Perchlorate-Diethyl Ether Medium. Evidence for the Formation of Oxocarbenium Ion Intermediate from Acetals
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Aldehydes and acetals were very efficiently converted to acyclic and cyclic dithioacetals in 5 M lithium perchlorate/diethyl ether (LPDE) medium at ambient temperature in high yields.Spectroscopic and other experimental evidences strongly suggest the formation of oxocarbenium ion intermediates from acetals in 5 M LPDE which subsequently reacted with thiols to give the dithioacetals.Under the same conditions ketones and their acetals also reacted, albeit very slowly compared to aldehydes and acetals, to yield dithioacetals.The difference in their reactivity was successfully employed in the chemoselective dithioacetalization of aldehydes and acetals in the presence of ketones and their acetals.The chemoselective dithioacetalization of keto aldehydes has been realized with the keto group remaining intact.The present method offers a convenient, efficient, and neutral medium for the deprotection of acetals to aldehydes and also the chemoselective protection of aldehydes to dithioacetals.
- Saraswathy, V. Geetha,Sankararaman, S.
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p. 4665 - 4670
(2007/10/02)
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- ENANTIOSELECTIVE OXIDATION OF CYCLIC DITHIOACETALS AND DITHIOKETALS
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The asymmetric oxidation of a series of dithio acetals and dithio ketals to their corresponding monosulphoxides by the procedure developed in our laboratory has been carried out.Simple 1,3-dithiolanes pr
- Furia, Fulvio Di,Licini, Giulia,Modena, Giorgio
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p. 165 - 170
(2007/10/02)
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- Comparative radioprotective activity of various pentagonal compounds with two heteroatomes
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Various heterocyclic compounds with two heteroatomes were synthesized and their potential radioprotective activity was tested. This study shows the interest of phenylthiazolidines derivatives in chemical radioprotection.
- Robbe,Fernandez,Dubief,et al.
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p. 235 - 243
(2007/10/02)
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- The Reaction of 2-Ethoxy-1,3-dithiolane with Carbonyl Compounds
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The reaction of 2-ethoxy-1,3-dithiolane with carbonyl compounds such as aldehydes and ketones was investigated.The reaction proceeded smoothly in the presence of the HgCl2-catalyst to afford 2-substituted and 2,2-disubstituted 1,3-dithiolanes.The reaction
- Jo, Shigeo,Tanimoto, Shigeo,Oida, Tatsuo,Okano, Masaya
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p. 1434 - 1436
(2007/10/02)
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