Ketone di- SEC-alkyl acetals are obtainedin good to excellent yields by treatment of ketones with tri- SEC-alkyl orthoformate and the correspondingalcohol in the presence of a catalytic amount of cerium(III) trifluoromethanesulfonate.
2-Aza-1,3-butadienes bearing alkoxyl substituent were obtained easily by the reaction of ketimines with orthoesters. The reaction proceeded smoothly by the addition of small amount of p-toluenesulfonic acid. When acetals were used in place of orthoesters, the corresponding 2-aza-1,3-butadienes were similarly prepared.
[EN] PROCESS FOR PRODUCING TRIFLUOROMETHYL-SUBSTITUTED 2-ALKOXYACETOPHENONE DERIVATIVES<br/>[FR] PROCEDE DE PRODUCTION DE DERIVES DE 2-ALCOXYACETOPHENONE TRIFLUOROMETHYLE-SUBSTITUEE
申请人:CENTRAL GLASS CO LTD
公开号:WO2004014887A1
公开(公告)日:2004-02-19
A process for producing a brominated acetal (represented by the formula 3) includes (a) brominating a trifluoromethyl-substituted acetophenone by Br2 in the presence of an alkylene diol. It is optional to produce a trifluoromethyl-substituted 2-alkoxyacetophenone derivative (represented by the formula 9) by (b) reacting the brominated acetal with a metal alkoxide, thereby converting the brominated acetal into an ether; and (c) hydrolyzing the ether in the presence of an acid catalyst to remove an acetal group from the ether, thereby producing the 2-alkoxyacetophenone derivative. Alternatively, the 2-alkoxyacetophenone can be produced by (a) reacting a trifluoromethyl-substituted phenacyl halide with an acetalization agent, thereby converting the phenacyl halide into an acetal; (b) reacting the acetal with a metal alkoxide, thereby converting the acetal into an ether; and (c) hydrolyzing the ether in the presence of an acid catalyst to remove the acetal group from the ether.
The present invention relates to a general synthesis for producing secondaryalkoxy-1-alkenes in commercial quantities in good yields by reacting cyclic and acyclic ketones and the corresponding alcohol with a secondary alkyl orthoformate ester in the presence of an acid catalyst, a Lewis acid, ferric chloride being preferred, and recovering the produce as a liquid of high purity.
Process for the production of secondary alkoxy-1-alkenes
申请人:Creanova Inc.
公开号:EP1022266A1
公开(公告)日:2000-07-26
The present invention relates to a general synthesis for producing secondaryalkoxy-1-alkenes in commercial quantities in good yields by reacting cyclic and acyclic ketones and the corresponding alcohol with a secondary alkyl orthoformate ester in the presence of an acid catalyst, Lewis acids, and recovering the product as a liquid of high purity.