Aktivierung von CO 2 an übergangsmetallzentren: zum ablauf der homogen-katalytischen bildung von 2-pyron aus kohlendioxid und hex-3-in an nickel (0)- …

D Walther, G Bräunlich, R Kempe, J Sieler

Index: Walther, Dirk; Braeunlich, Gabriele; Kempe, Rhett; Sieler, Joachim Journal of Organometallic Chemistry, 1992 , vol. 436, # 1 p. 109 - 119

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Citation Number: 41

Abstract

Abstract IR-investigations of the catalytic formation of tetraethyl-2-pyrone from hex-3-yne and CO 2 at (TMED) Ni 0-or (COD) Ni 0 centres show that in the first step of this reaction the nickel (0) complex reacts under oxidative coupling with both CO 2 and alkyne to afford the five-membered metallacycle A. The alternative route, the oxidative coupling of two alkynes at nickel (0), can be excluded. Complex A reacts in a second step with a further molecule ...