methyl arachate methyl behenate methyl dimethyloctanoate methyl butylheptylnonanoate methyl hexenoate methyl octenoate methyl decenoate methyl dodecenoate methyl tetradecenoate methyl hexadecenoate methyl octadecenoate methyl eicosenoate methyl docosenoate dimethyl adipate dimethyl azelate dimethyl sebacate dimethyl deca methylenedicarboxylate dimethyl hexadecamethylene dicarboxylate and dimethyl octadecamethylenedi carboxylate the aliphatic glycerides to be used in the present invention may preferably include a glycerin ester of a linear or branched c 6 c 22 saturated or unsaturated aliphatic monocarboxylic acid among the glycerin esters in particular natural oils and fats of animals or plants are effective the aliphatic glyceride may be used alone or in a mixture of different glycerin esters examples of these aliphatic glycerides may be beef tallow pork tallow soybean oil cotton seed oil rapeseed oil coconut oil palm oil palm kernel oil and tall oil the catalyst to be used in the present invention is a composite oxide catalyst comprising titanium oxide as the main component preferably one composed essentially of titanium oxide and at least one member selected from the group consisting of oxides of silicon niobium zirconium tantalum gallium and germanium particularly preferably one composed essentially of titanium oxide and one oxide selected from among silica niobium oxide and zirconium oxide it is preferable from catalytic activity that the content of oxides other than titanium oxide in the composite oxide catalyst is 1 to 25 by weight still preferably 1 to 15 by weight further the titanium oxide content of the composite oxide catalyst according to the present invention in terms of titanium at metallic state is preferably 44 to 75 by weight still preferably 50 to 75 by weight while that in terms of the titanium oxide is preferably 75 to 99 by weight still preferably 85 to 99 by.