Chemoselective (Trans)thioacetalization of Carbonyl Compounds with a Reusable Lewis Acid-Surfactant-Combined Copper Bis(dodecyl sulfate) Catalyst in Water
Novel (thio) (meth) acrylate monomers, intermediate compounds for the synthesis of these monomers polymerizable compositions and polymers obtained, and their optical and ophthalmic uses
申请人:Essilor Compagnie Generale D'Optique
公开号:US20020049289A1
公开(公告)日:2002-04-25
The novel monomers correspond to the formula:
1
in which:
Z represents H or CH
3
and X represents O or S, and
Y is a 5- to 8-membered heterocycle consisting of hydrogen, carbon and sulphur atoms and at least two endocyclic sulphur atoms.
Application: to the manufacture of waveguides, optical fibers and spectacle lenses.
这些新型单体的化学式为
1
其中
Z 代表 H 或 CH
3
X 代表 O 或 S,以及
Y 是由氢、碳和硫原子以及至少两个内环硫原子组成的 5 至 8 元杂环。
应用:用于制造波导、光纤和眼镜片。
Catalytic carbon–sulfur bond formation by amphoteric vanadyl triflate: exploring with thia-Michael addition, thioacetalization, and transthioacetalization reactions
作者:Chien-Tien Chen、Yow-Dzer Lin、Cheng-Yuan Liu
DOI:10.1016/j.tet.2009.10.012
日期:2009.12
A series of thiols have been examined as protic nucleophiles for Michael-type additions to alpha,beta-unsaturated carbonyls as well as double nucleophilic condensations with aldehydes, ketones, and acetals catalyzed by amphoteric, water-tolerant vanadyl triflate under mild and neutral conditions. The newly developed C-S bond formation protocols were carried out smoothly in good to high yields in a highly chemoselective manner. (C) 2009 Elsevier Ltd. All rights reserved.
Chemoselective (Trans)thioacetalization of Carbonyl Compounds with a Reusable Lewis Acid-Surfactant-Combined Copper Bis(dodecyl sulfate) Catalyst in Water
A Lewis acid-surfactant-combined copper bis(dodecyl sulfate) [Cu(DS)2] catalyst served as an efficient and reusable catalyst for the thioacetalization and transthioacetalization of carbonyl compounds and O,O-acetals in water at room temperature. Some of the major advantages of this procedure are high chemoselectivity, ease of operation and purification without any organic solvent, and high yields.
A CONVENIENT HIGH YIELD SYNTHESIS OF FUNCTIONAL METHACRYLATES <i>VIA</i> DETHIOACETALIZATION. SYNTHESIS OF METHACRYLATE S,S-ACETAL DERIVATIVES AS INTERMEDIATES
Abstract We describe a selective and efficient synthesis of a whole new class of functional methacrylates starting from S,S-acetals. Carbonyl compounds were regenerated from corresponding S,S-acetals using mercury (11) salts. According to this method, methacrylic sensitive group (possible polymerization), is not affected.