[2+2] Cycloaddition of 1,3-Dienes by Visible Light Photocatalysis
作者:Anna E. Hurtley、Zhan Lu、Tehshik P. Yoon
DOI:10.1002/anie.201405359
日期:2014.8.18
[2+2] Photocycloadditions of 1,3‐dienes represent a powerful yet synthetically underutilized class of reactions. We report that visiblelight absorbing transition metal complexes enable the [2+2] cycloaddition of a diverse range of 1,3‐dienes. The ability to use long‐wavelength visiblelight is attractive because these reaction conditions tolerate the presence of sensitive functional groups that might
A New Synthetic Approach to Phenol Derivatives: Use of Ring-Closing Olefin Metathesis
作者:Kazuhiro Yoshida、Tsuneo Imamoto
DOI:10.1021/ja050853x
日期:2005.8.1
Phenol derivatives, which are one of the most important classes of aromatic compounds in organic chemistry, were synthesized by ruthenium-catalyzed ring-closing olefin metathesis (RCM) of 1,4,7-trien-3-ones with versatile substitution patterns. The RCM reaction for producing phenol derivatives was also successful with 1,5,7-trien-3-one as another precursor. Most of the phenols prepared here could not
Allylicalcohols were selectively oxidized into aldehydes or ketones using a Pd(OAc) 2 -Et 3 N-O 2 system. Diols with one -allylic function were selectively oxidized, with one of the hydroxyl groups remaining untouched.
使用 Pd(OAc) 2 -Et 3 NO 2 系统将烯丙醇选择性氧化成醛或酮。具有单烯丙基官能团的二醇被选择性氧化,其中一个羟基保持不变。
[EN] PROCESS FOR THE PREPARATION OF 3-METHYLENE-?-BUTYROLACTONE<br/>[FR] PROCÉDÉ POUR LA PRÉPARATION DE 3-MÉTHYLÈNE-G-BUTYROLACTONE
申请人:DSM IP ASSETS BV
公开号:WO2012116977A1
公开(公告)日:2012-09-07
The invention relates to a process for the preparation of 3-methylene-γ-butyrolactone (Z), the process comprising a hydroformylation step wherein 1,4-butene-diol (X) or its ester derivative cis-1,4-diacetoxy butene (Y) is subjected to H2 gas and CO gas in the presence of a hydroformylation catalyst, thereby forming an intermediate product comprising a mixture of compounds containing an aldehyde group or a hemiacetal, and an oxidation step wherein the intermediate product or hydrolyzed derivative thereof is oxidized by an oxidation agent thereby forming Z.