PROBLEM TO BE SOLVED: To obtain a highly active catalyst for de-carbonylation reaction capable of producing a carboxylic acid ester with high selectivity at a high yield even at a low temp. by forming a catalyst from an organic phosphorous compound composed of 3-valent or 5-valent phosphorous atom and having carbon- phosphorous bond. ;SOLUTION: This catalyst is constituted of the organic phosphorus compound composed of 3-valent or 5-valent phosphorous atom and having at least one carbon-phosphorous bond. Particularly, an organic phosphorus compound composed of 3-valent or 5-valent phosphorus atom and having ≥3 carbon- phosphorous bonds is preferable and as the organic phosphorous compound, for example, a phosphonium salt, phosphine, phosphine dihalide and phosphine oxide are cited. The catalyst is remarkably useful for the catalyst for de- carbonylating an α-carbonyl carboxylic acid ester, particularly a haloglyoxylic acid aryl ester, an aryl glyoxylic acid aryl ester, a heterocyclic glyoxylic aryl ester, an oxalic diaryl ester or the like.;COPYRIGHT: (C)1998,JPO
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