Isomerization of Allyl Ethers Initiated by Lithium Diisopropylamide
摘要:
Lithium diisopropylamide (LDA) promotes virtually quantitative conversion of allylic ethers to (Z)-propenyl ethers. It was discovered that allylic ethers can be isomerized efficiently with very high stereoselectivity to (Z)-propenyl ethers by LDA in THF at room temperature. The reaction time for the conversion increases with more sterically hindered allylic ethers. Different amides were also compared with LDA for their ability to effect this isomerization.
Aldehyde compositions and methods for providing fragrance containing the same
申请人:International Flavors & Fragrances Inc.
公开号:US07932293B2
公开(公告)日:2011-04-26
The present invention is directed to the novel aldehyde compounds, represented by the general structure of Formula I set forth below:
wherein R is a straight, branched hydrocarbon moiety consisting of 3 to 10 carbon atoms and may contain one or more oxygen heteroatom.
Reaction products of 2-methyl-1, 3-dichloropropane and alcohols
申请人:DOW CHEMICAL CO
公开号:US02148437A1
公开(公告)日:1939-02-28
Controlled Radical Polymerization-Derived Block Copolymer Compositions for Medical Device Coatings
申请人:Chen Mingfei
公开号:US20080305143A1
公开(公告)日:2008-12-11
Controlled radical polymerization-derived biocompatible block copolymer coatings for medical devices are disclosed. Specifically, block copolymer coatings designed to control the release of bioactive agents from medical devices in vivo are disclosed. The present application also discloses providing vascular stents with drug-eluting controlled release block copolymer coatings and related methods for making these medical devices and coatings.
US7932293B2
申请人:——
公开号:US7932293B2
公开(公告)日:2011-04-26
[EN] AMINOALCOHOL LIPIDOIDS AND USES THEREOF<br/>[FR] LIPIDOÏDES AMINOALCOOL ET LEURS UTILISATIONS
申请人:MASSACHUSETTS INST TECHNOLOGY
公开号:WO2010053572A2
公开(公告)日:2010-05-14
Aminoalcohol lipidoids are prepared by reacting an amine with an epoxide-terminated compound are described. Methods of preparing aminoalcohol lipidoids from commercially available starting materials are also provided. Aminoalcohol lipidoids may be prepared from racemic or stereochemically pure epoxides. Aminoalcohol lipidoids or salts forms thereof are preferably biodegradable and biocompatible and may be used in a variety of drug delivery systems. Given the amino moiety of these aminoalcohol lipidoid compounds, they are particularly suited for the delivery of polynucleotides. Complexes, micelles, liposomes or particles containing the inventive lipidoids and polynucleotide have been prepared. The inventive lipidoids may also be used in preparing microparticles for drug delivery. They are particularly useful in delivering labile agents given their ability to buffer the pH of their surroundings.