Reactions of 1,1-bis(N,N-dimethylamino)-1,3-butadiene with olefins. Zwitterion formation and (4+2) cycloaddition as competing pathways.
作者:Reiner Sustmann、Monika Rogge
DOI:10.1016/0040-4039(90)80202-w
日期:1990.1
Reactions of 1,1 bis(N,N-dimethylamino)-1,3-butadiene (2) with acrylonitrile and tetracyanoethylene are described. At 80°C acrylonitrile affords a (4+2) cycloadduct (3), whereas a zwitterion (4), formed from 2 and tetracyanoethylene even at −40°C, is characterized in solution and trapped as picrate. It eliminates hydrogen cyanide at T>−20°C to give a cyanine (5). Ring closure of the zwitterion either
METHOD FOR DELIVERING BIOLOGICALLY ACTIVE SUBSTANCES
申请人:Ciba Specialty Chemicals Holding Inc.
公开号:EP1532310A1
公开(公告)日:2005-05-25
[EN] METHOD FOR DELIVERING BIOLOGICALLY ACTIVE SUBSTANCES<br/>[FR] PROCEDE D'ADMINISTRATION DE SUBSTANCES ACTIVES AU PLAN BIOLOGIQUE
申请人:CIBA SC HOLDING AG
公开号:WO2004020729A1
公开(公告)日:2004-03-11
The present application relates to a method for the controlled and/or slow release of a biologically active hydroxyl group containing substance on a substrate which comprises reacting said hydroxyl group containing substance subsequently with a halogen-substituted aliphatic carboxylic acid halide and either a diamine containing at least one tertiary amino group or a heterocyclic aromatic amine, applying the thus obtained water-soluble ester to the substrate and finally hydrolysing the ester on the substrate.