Investigations Towards the Chemoselective Thioacetaliztion of Carbonyl Compounds by Using Ionic Liquid[bmim]Br as a Recyclable Catalytic Medium
作者:Ahmed Kamal、Gagan Chouhan
DOI:10.1002/adsc.200303171
日期:2004.4
The ionicliquid based on the 1-n-butyl-3-methylimidazolium cation has been prepared and used as an efficient catalytic medum for the chemoselective thioacetalization of carbonylcompounds. Furthermore, recycling and reuse of this ionicliquidmedium has been demonstrated. Moreover, the use of this catalyticmedium not only avoids the generation of waste but also provides a green process with minimal
Chemoselective thioacetalization and transthioacetalization of carbonyl compounds catalyzed by immobilized scandium(III) triflate in ionic liquids
作者:Ahmed Kamal、Gagan Chouhan
DOI:10.1016/s0040-4039(03)00580-x
日期:2003.4
Immobilized scandium triflate [Sc(OTf)(3)] in ionic liquids has been found to be an extremely efficient and recyclable catalyst for the thioacetalization and transthioacetalization of both aromatic and aliphatic aldehydes. Significant rate acceleration and chemoselectivity was achieved by employing this catalytic system. (C) 2003 Elsevier Science Ltd. All rights reserved.
A Mild and Chemoselective Dithioacetalization of Aldehydes in the Presence of Anhydrous Copper (II) Sulfate
Various aldehydes have been protected with different thiols as dithioacetals with excellent yields using anhydrouscoppersulfate as a mild and chemoselective catalyst. The reaction is carried out in a solvent and/or under solvent-free conditions. The transthioacetalization of oxyacetals into dithioacetals was also achieved in an excellent yield.
[EN] NOVEL DITHIOKETAL<br/>[FR] NOUVEAU DITHIOCETAL
申请人:BIOCON LTD
公开号:WO2004103957A1
公开(公告)日:2004-12-02
A novel compound of formula (I) and a process for the preparation of compounds of formula (I): by reacting a compound of formula (II): Formula (III): with a compound of formula (III) where R1 and R2 are any suitable alkyl group, preferably C2H5 or R1 and R2 can join together to form any cyclic structure, preferably -CH2-Ch2-CH2-.