Synthesis of variously substituted allenediynes and their cobalt (I)- mediated [2+2+2] cycloaddition reactions

Article abstract of DOI:10.1016/S0040-4020(98)00567-5

Syntheses of variously substituted allenediynes where the allene moiety is at the terminal or internal position are described. Their cobalt(I)- mediated [2+2+2] cycloaddition reactions led to the corresponding η⁴- complexed tricyclic compounds; the regioselectivity of these cyclizations depending on the substitution and the position of the allene is discussed.