Pauson-Khand Carbonylative Cocyclizations of Acetylenes with Cyclopropylallenes

2007 
The Pauson-Khand-like carbonylative cocyclizations of alkynes with cyclopropylallene and with 1,3-dicyclopropylallene occur regioselectively and lead to 4-(cyclopropylmethylene)cyclo-pentenones (43-59% for six examples).
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