Samarium diiodide-promoted intramolecular ketone–ester coupling reaction: novel cyclization and ring expansion pathway
作者:Kazuki Iwaya、Momoe Nakamura、Eietsu Hasegawa
DOI:10.1016/s0040-4039(02)01007-9
日期:2002.7
2-substituted-1-indanone-2-carboxylates were treated with samarium diiodide (SmI2), ring expansion products such as 3-substituted-1,2-naphthoquinones were isolated. Alcohols were also obtained as the mixture of cis- and trans-isomers of hydroxy and ester substituents. A reaction mechanism involving intramolecular addition of samarium ketyl radicals to ester substituents followed by ring expansion was proposed
[EN] CYCLOPENTANE CARBOXYLATE COMPOUNDS, PROCESS AND INTERMEDIATES FOR PREPARING THE SAME AND USE THEREOF<br/>[FR] COMPOSES DE CARBOXYLATE DE CYCLOPENTANE, PROCEDE ET INTERMEDIAIRES DE PREPARATION DE CEUX-CI ET LEUR UTILISATION
申请人:CHINA PETROLEUM & CHEMICAL
公开号:WO2006045246A1
公开(公告)日:2006-05-04
[EN] The present invention discloses cyclopentane carboxylate compounds. The I-hydrocarbyl-2-acyloxy-cyclopentane carboxylates according to the invention have a general formula (I): wherein groups R1, R2 and R3, which are identical or different, are independently selected from the group consisting of linear or branched C1-C20alkyl, C3-C20cycloalkyl, C6-C20aryl, C7-C20alkaryl and C7-C20aralkyl. The present invention also discloses a process as well as intermediate compounds for preparing the compounds of formula (I), and use of the compounds (I) as electron donor in the preparation of catalysts for propylene polymerization. [FR] Composés de carboxylate de cyclopentane, les carboxylates de 1-hydrocarbyl-2-acyloxy-cyclopentane de cette invention ayant une formule générale (I) dans laquelle R1, R2 et R3, identiques ou différents, sont sélectionnés indépendamment dans le groupe constitué d'un alkyle C1-C20, cycloalkyle C3-C20, aryle C6-C20, alkaryle C7-C20 et aralykyle C7-C20 linéaire ou ramifié. Procédé et composés intermédiaires de préparation des composés de formule (I), et utilisation des composés (I) comme donneurs d'électrons dans la préparation de catalyseurs en vue de la polymérisation du propylène.