Abstract
Abstract Allenyl esters R 1 R 2 C=C=C(H)C(O)R (R = OMe) or amides (R = NEt 2 ) are formed with excellent selectivities and in good yields by carbonylation of propynyl and allenyl halides at 1–20 bar CO pressure in benzene, in the presence of MeOH or HNEt 2 and 1% of Pd(PPh 3 ) 4 or trans -Me 2 C=C=C(H)Pd(PPh 3 ) 2 Br. Possible organometallic intermediates are discussed.
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