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Syntheses of σ-cyclobut-1-en-3-onyl complexes by cycloaddition of ketenes to some transition metal alkynyl complexes
Authors:Pangbu Hong  Kenkichi Sonogashira  Nobue Hagihara
Institution:The Institute of Physical and Chemical Research, Wako-shi, Saitama 351 Japan;The Institute of Scientific and Industrial Research, Osaka University, Suita, Osaka 565 Japan
Abstract:Reactions of ketenes (R1R2CCO) with (η5-C5H5)Ni(PPh3)CCR (I) and (η5-C5H5)Fe(CO)(L)CCR (III, L = CO and PPh3) give σ-cyclobut-1-en-3-onyl complexes, {(η5-C5H5)Ni(PPh3)CC(R)COC}R1R2 (VI) and (η5-C5H5)Fe(CO)(L)CC(R)COCR1R2 (IX)}, (2 + 2) cycloaddition products, in good yields. The σ-cyclobutenonyl complexes also can be prepared by the reaction of I and III with acyl chlorides in the presence of triethylamine.
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