Dichotomous Reactivity in the Reaction of Triethyl- and Triphenylphosphane HBr Salts with Dimethyl Acetals: A Novel Entry to α-Alkoxy-Functionalized Ylides and General Synthesis of Vinyl Ethers and Alkoxy Dienes
作者:Priyabrata Das、James McNulty
DOI:10.1002/ejoc.201000601
日期:2010.7
discovery of dichotomousreactivity in the reaction of trialkyl- vs. triphenylphosphaneHBrsalts with acetals allows entry to functionalized α-methoxy phosphonium salts and a novel process for tertiary phosphane methylation. The new protocol opens a generalentry to the synthesis of vinylethers and differentially substituted 1,3-dienes via Wittig reactions of the functionalized ylides derived from
(α-Methoxybenzyl)trimethylsilane is deprotonated with butyllithium and then allowed to react with a variety of carbonyl compounds giving vinylethers which are convertible into methyl ketones under mild conditions.
NON-VISUALIZED PERMANENT INFORMATION RECORDING SUBSTRATE FOR USE AS SECURITY LABEL FOR AUTHENTICATION
申请人:COUNCIL OF SCIENTIFIC ANDINDUSTRIAL RESEARCH
公开号:EP1487936A1
公开(公告)日:2004-12-22
US6951692B1
申请人:——
公开号:US6951692B1
公开(公告)日:2005-10-04
[EN] NON-VISUALIZED PERMANENT INFORMATION RECORDING SUBSTRATE FOR USE AS SECURITY LABEL FOR AUTHENTICATION<br/>[FR] SUBSTRAT PORTEUR D'INFORMATIONS PERMANENTES NON VISIBLES DESTINE A ETRE UTILISE COMME ETIQUETTE DE SECURITE A DES FINS D'AUTHENTIFICATION
申请人:COUNCIL SCIENT IND RES
公开号:WO2003080759A1
公开(公告)日:2003-10-02
The present invention relates to an information carrying substrate capable of being applied to a surface for authenticating said surface, and more particularly, the present invention relates to a an information carrying substrate capable of being affixed to a document or a product for authenticating the document or the productand also relates to method for writing an authenticating information on said substrate and further provides a method for authenticating a surface using said substrate.