Patent ID: 7446218
Filing Date: 2008-11-04
Classification: C07C

Abstract:
1. A method for producing a carbonic ester of a formula RO(CO)OR, wherein R represents an unsaturated or saturated hydrocarbon group, comprising the steps of: (1) performing a reaction between a first organometal compound mixture and carbon dioxide, said first organometal compound mixture comprising a mixture of a reactive organometal compound having in its molecule at least two metal-oxygen-carbon linkages and an unregenerable unreactive compound which is derived from said reactive organometal compound and which has in its molecule at least three metal-carbon linkages, wherein said reactive organometal compound comprises at least one compound selected from the group consisting of: an organometal compound represented by the formula (1): wherein: M each of R R each of a and b is an integer of from 0 to 2, a+b=0 to 2, each of c and d is an integer of from 0 to 4, and a+b+c+d=4; and an organometal compound represented by the formula (2): wherein: each of M each of R R each of e, f, g and h is an integer of from 0 to 2, e+f=0 to 2, g+h=0to 2, each of i and j is an integer of from 1 to 3, e+f+i=3, and g+h+j=3, to thereby obtain a reaction mixture containing a carbonic ester formed by the reaction, said unregenerable unreactive compound, and a regenerable metamorphic organometal compound derived from said reactive organometal compound, (2) separating said reaction mixture into a first portion containing said carbonic ester and said unregenerable unreactive compound, and a second portion containing said regenerable metamorphic organometal compound, and (3) reacting said second portion of said reaction mixture with a first alcohol to form a second organometal compound mixture and water and removing said water from said second organometal compound mixture, said second organometal compound mixture comprising a mixture of a reactive organometal compound having in its molecule at least two metal-oxygen-carbon linkages and an unregenerable unreactive compound which is derived from said reactive organometal compound and which has in its molecule at least three metal-carbon linkages.