| 摘要 |
PURPOSE: To obtain a pentenoic acid ester useful as a synthetic intermediate for medicines, agrochemicals, etc., in high selectivity and yield under mild conditions by reacting a conjugated diene with carbon monoxide and an alcohol in the presence of a specific metallic salt. CONSTITUTION: This method for producing an alkenecarboxylic acid ester (e.g. methyl pentenoate) is to react a conjugated diene with CO and an alcohol in the presence of (1) a Pd compound, (2) a bidentate ligand of formula I (Z is a group VA atom of the periodic table; R is a 2-6C bivalent organic residue; R<1> to R<4> are each a 1-8C alkyl or an aryl), a tridentate ligand of formula II (R<5> to R<9> are each a 1-8C alkyl or an aryl) or a unidentate ligand of formula III (R<10> to R<12> are each a 1-8C alkyl or an aryl), (3) a protonic acid having >3 value of the pKa measured in an aqueous solution at 18 deg.C and (4) at least one kind of metallic salt selected from Li, Na, K, Rb, Cs and Zn, preferably at 80-180 deg.C temperature under 40-120kg/cm<2> G pressure. |
