Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Cis-configurational unsaturated ester, process for producing the same, and fragrance composition containing the same
 The present invention provides a cis-configurational unsaturated ester represented by the formula (1) ##STR1## (where R is a methyl group or a phenyl group, and n is 1 or 2) and also provides a fragrance composition containing the cis-configurational unsaturated ester in an effective amount. The cis-configurational unsaturated ester represented by the formula (1) can be produced by reacting a cyclic vinyl ether represented by the formula (2a) ##STR2## (where n is defined as above) with a Grignard reagent represented by the formula (3a) EQU RMgX (3a) (where R is defined as above, and X is a chlorine atom, a bromine atom or an iodine atom) in the presence of a triarylphosphine and not more than 0.05 mol of a nickel compound per one mole of the cyclic vinyl ether represented by the formula (2a) to give a cis-configurational unsaturated alcohol represented by the formula (4a) ##STR3## (where n and R are defined as above); and subjecting this cis-configurational unsaturated alcohol to acylation with acetic acid or a derivative thereof to give the cis-configurational unsaturated esters represented by the formula (1). 
Kuraray Co., Ltd.
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Yoshin Kunio Toshiki
Tamai Mayahara Mori