Asymmetric Acid-Catalyzed Meerwein−Ponndorf−Verley−Aldol Reactions of Enolizable Aldehydes
摘要:
A highly, stereo- and regioselective Meerwein - Ponndorf - Verley - Aldol etherification process of enolizable aldehydes is described. This new transformation is catalyzed by trifluoroacetic acid. The method also allows cross-aldol reactions with alpha-branched enolizable aldehydes and thus provides access to defined configured quaternary stereogenic centers.
Acid-catalyzed aldol-Meerwein–Ponndorf–Verley-etherification reactions—access to defined configured quaternary stereogenic centers
摘要:
A novel asymmetric aldol-reduction-etherification process of aliphatic enolizable aldehydes is described. The intermediately formed aldol adducts-beta-hydroxyaldehydes-were reduced and transformed into the corresponding 1,3-diol ethers by external secondary alcohols at the same time. Thus, with the help of chiral secondary alcohols an access to optically active 1,3-diol ether is given. Furthermore, asymmetric cross-aldol-Meerwein-Ponndorf reactions of enolizable aldehydes can also be realized under these reaction conditions. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
[EN] HETEREOCYCLIC AGENT AS CATALYTIC STABILIZING AGENT IN A HYDROFORMYLATION PROCESS<br/>[FR] AGENT HÉTÉROCYCLIQUE COMME AGENT DE STABILISATION CATALYTIQUE DANS UN PROCÉDÉ D'HYDROFORMYLATION
申请人:DOW TECHNOLOGY INVESTMENTS LLC
公开号:WO2014149915A1
公开(公告)日:2014-09-25
A heterocyclic nitrogen stabilizing agent is employed to reduce the rate of catalyst deactivation in a hydroformylation process.
在氢甲酰化过程中,使用杂环氮稳定剂来降低催化剂失活的速率。
LINEAR CYCLODEXTRIN COPOLYMERS
申请人:Davis Mark E.
公开号:US20130184453A1
公开(公告)日:2013-07-18
Linear cyclodextrin copolymers and linear oxidized cyclodextrin copolymers containing an unoxidized and/or an oxidized cyclodextrin moiety integrated into the polymer backbone are described. Methods of preparing such copolymers are also described. The linear cyclodextrin copolymer and linear oxidized cyclodextrin copolymer of the invention may be used as a delivery vehicle of various therapeutic agents.
ORGANOSILICON COMPOUND, THIN FILM FORMING COMPOSITION USING SAME, AND ORGANIC THIN FILM
申请人:NIPPON SODA CO., LTD.
公开号:US20150148483A1
公开(公告)日:2015-05-28
The present invention is intended to provide an organosilicon compound for forming a novel organic thin film having improved physical properties. An organosilicon compound of the present invention is an organosilicon compound represented by formula (I) R—(CH
2
)
n
—SiX
3
(I) (wherein R represents an alkoxy group having 1 to carbon atoms or a phenyl group that optionally has a substituent, X represents a hydroxyl group or a hydrolyzable group, and n represents any integer from 17 to 24). An organic thin film can be formed by mixing the aforementioned organosilicon compound, a compound that can interact with the organosilicon compound, and water in an organic solvent to prepare an organic thin film forming solution, and bringing the organic thin film forming solution into contact with a substrate.
Coating composition and process for manufacturing the same
申请人:JAPAN SYNTHETIC RUBBER CO., LTD.
公开号:EP0555879A1
公开(公告)日:1993-08-18
A coating composition prepared by adding 0 to 150 parts by weight, in terms of diorganosilane, of a hydrolyzate and/or a partial condensate of an diorganosilane (b), 2 to 300 parts by weight of a vinyl resin containing a silyl group (c), 0.01 to 50 parts by weight of a metal chelate compound (d), and an organic solvent (e), to 100 parts by weight in terms of organosilane of a hydrolyzate and/or a partial condensate of an organosilane (a), to which are added two or more mols of a type of β-diketone and/or β-ketoester (f) for one mol of the metal chelate compound (d).
Hydroformylation process for producing 1,6-hexanedials
申请人:UNION CARBIDE COATINGS
SERVICE TECHNOLOGY CORP.
公开号:EP0577042A1
公开(公告)日:1994-01-05
This invention relates to a hydroformylation process for producing a 1,6- hexanedial which comprises reacting a butadiene with hydrogen and carbon monoxide in the presence of a catalytic amount of rhodium complexed with certain poly-phosphite ligands to achieve high conversions of the butadiene to the 1,6-hexanedial.