Ring-closing metathesis of α-ester-substituted enol ethers: application to the shortest synthesis of KDO
摘要:
Ring-closing metathesis reactions of alpha-ester-substituted enol ethers are described. In the case of unsubstituted terminal olefins, isomerization prior to cyclization was observed as an undesired side reaction, which could not be completely inhibited. Furthermore, this methodology was applied to a formal synthesis of KDO, which now represents the shortest synthetic pathway to KDO and its deoxy analogue. Interestingly, in this route olefin isomerization was not observed, presumably due to the increased steric environment of the double bond. Finally, an efficient two-step conversion to transform an alcohol into an alpha-alkoxy acrylate is also described. (C) 2003 Elsevier Ltd. All rights reserved.
ORGANIC SILANE COMPOUND FOR FORMING SI-CONTAINING FILM BY PLASMA CVD AND METHOD FOR FORMING SI-CONTAINING FILM
申请人:Hamada Yoshitaka
公开号:US20100137626A1
公开(公告)日:2010-06-03
An organic silane compound for forming a Si-containing film by plasma CVD is provided. The silane compound contains 2 or more silicon atoms bonded by an intervening straight chain or branched oxygen-containing hydrocarbon chain having 4 to 8 carbon atoms containing a bond represented by C
p
—O—C
q
wherein p and q independently represent number of carbon atoms with the proviso that 2≦p≦6 and 2≦q≦6 and the carbon chains do not contain an unsaturated bond which conjugates with the oxygen atom, wherein all of the 2 or more silicon atoms has 1 or more hydrogen atom or an alkoxy group having 1 to 4 carbon atoms.
[EN] REDUCTION OF ALDEHYDES AND KETONES TO ALCOHOLS<br/>[FR] RÉDUCTION D'ALDÉHYDES ET DE CÉTONES EN ALCOOLS
申请人:AMERICAN PACIFIC CORP
公开号:WO2011060302A1
公开(公告)日:2011-05-19
The embodiments described herein provide a reduction of an aldehyde or a ketone, such as a Meerwein-Ponnorf-Verley (MPV) reaction of an aldehyde or ketone. In some embodiments, the reaction occurs in the presence of A1[OC(CH3)3]. In some embodiments, the reaction occurs in the presence of an aprotic solvent. In some embodiments, the aldehyde or ketone is an amino aldehyde or an amino ketone wherein the amine is group is protected such that the nitrogen of the amine has no proton. Other embodiments related to compositions and compounds related to the reduction reaction, or to the preparation or use of the aldehyde, the ketone, or the resulting alcohol.
Synthesis of substituted aromatic compounds by Diels–Alder reactions of alkoxycyclobutenes produced via photocycloadditions between vinyl ethers and 1,3-dione enol esters
作者:Andrew J. Barker、Michael J. Begley、Alan M. Birch、Gerald Pattenden
DOI:10.1039/p19830001919
日期:——
The adduct (5) obtained from [2 + 2] photocycloaddition of ethyl vinyl ether to the 1,3-dione enol acetate (4) rapidly loses acetic acid producing the ethoxycyclobutene (7). On being warmed in the presence of a dienophile, the ethoxycyclobutene (7) undergoes electrocyclic ring-opening to give the ethoxydienone (8) followed by [4 + 2] cycloaddition to produce Diels–Alder adducts [e.g.(10) with dimethyl
MONOMERS AND POLYMERS CARRYING IMIDAZOLE AND BENZIMIDAZOLE GROUPINGS, AND PROTON EXCHANGE MEMBRANE CONTAINING THE SAME FOR THE PRODUCTION OF A FUEL CELL
申请人:Glipa Xavier
公开号:US20100151351A1
公开(公告)日:2010-06-17
The invention relates to a monomer (
6, 14
) carrying an imidazole-type heterocycle (
3
). According to the invention, the chemical structure of said monomer (
6, 14
) comprises at least one unit of formula (I) wherein R1 comprises an alkenyl grouping and R2 comprises a grouping for protecting one of the nitrogen atoms of the heterocycle. The invention also relates to a monomer carrying a benzimidazole-type heterocycle, and to protected polymers obtained from said monomers, deprotected polymers produced by the protected polymers, a proton exchange membrane based on deprotected polymers, and a fuel cell provided with said membrane. Furthermore, the invention relates to methods for producing the above-mentioned monomers and polymers.
Synthesis of Allyl and Alkyl Vinyl Ethers Using an in Situ Prepared Air-Stable Palladium Catalyst. Efficient Transfer Vinylation of Primary, Secondary, and Tertiary Alcohols
作者:Martin Bosch、Marcel Schlaf
DOI:10.1021/jo034376h
日期:2003.6.1
An air-stable palladium catalyst formed in situ from commercially available components efficiently catalyzed the transfer vinylation between butyl vinyl ether and various allyl and alkyl alcohols to give the corresponding allyl and alkyl vinyl ethers in 61-98% yield in a single step.