Journal of Molecular Catalysis A-Chemical, Vol.195, No.1-2, 55-61, 2003
Palladium-catalyzed 1,6- and 1,5-diyne-carbon monoxide reaction for preparation of alkylidenecyclopentenones and -butenolides
Carbonylative [2 + 2 + 1] cycloaddition of 1,6-diyne under carbon monoxide at atmospheric pressure catalyzed by Pd-2(dba)(3)-PPh3-CF3SO3H presents a new approach to the formation of a bicyclo[3.3.0]octa-1,5-dien-3-one ring system. Under higher pressure the reaction of 1,6- and 1,5-diynes occurred in a different fashion via tandem insertion of carbon monoxide to yield alkylidenebutenolide. (C) 2002 Elsevier Science B.V. All rights reserved.