PROCESS FOR PREPARING ALKYLADAMANTYL ESTERS AND COMPOSITIONS

摘要

A process is provided, by which high-purity alkyladamantyl esters can be efficiently obtained by simple operation from alkyladamantyl ester compositions containing significant amounts of alkyladamantyl halides, the compositions being each prepared by alkylating 2-adamantanone obtained by oxidation of adamantane with an organometallic reagent and then reacting the resulting alkylate with an acid halide. Specifically, an alkyladamantyl ester (such as 2-methyl-2-adamantyl methacrylate) having a high purity can be obtained by adding, e.g., a mixed solution consisting of methanol and an aqueous sodium hydroxide solution to an alkyladamantyl ester composition containing an alkyladamantyl halide (such as 2-chloro-2-methyladamantane) in an amount exceeding 0.5 part by weight per 100 parts by weight of the alkyladmantyl ester, bringing the alkali compound into contact with the alkyladamantyl halide in a homogeneous system to convert the halide into a compound not generating an acid even in heating and thereby lower the alkyladamantyl halide content of the composition to 0.5 part by weight or below per 100 parts by weight of the alkyladamantyl ester, and then distilling the resulting composition.