炭酸ガス共存下におけるパラジウム錯体触媒によるイソプレンの二量化反応
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概要
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It has been found that the dimerization of isoprene catalyzed by palladium-tertiary phosphine complexes occurs in the presence of carbon dioxide to give 2, 7-dimethy 1-1, 3, 7, -octatriene, a tail-to-tail dimer, as the main product. In the adsence of carbon dioxide the palladium complexes catalyze the dimerization of isoprene only to low conversions. In addition to the isoprene dimers, there are also the incorporation of small amount of carbon dioxide in the reaction products. The carbon dioxide-incorporated products identified have the structures of five-membered lactone. The proposed mechanism for isoprene-carbon dioxide reaction involves the intermediate having a σ-allyl, π-allyl form.
- 社団法人 有機合成化学協会の論文