90047-79-3Relevant academic research and scientific papers
Synthesis of variously substituted allenediynes and their cobalt (I)- mediated [2+2+2] cycloaddition reactions
Llerena, Dominique,Buisine, Olivier,Aubert, Corinne,Malacria, Max
, p. 9373 - 9392 (2007/10/03)
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.
Cyclizations of ω-Allenyl Radicals
Apparu, Marcel,Crandall, Jack K.
, p. 2125 - 2130 (2007/10/02)
Allenyl halides of structure (CH3)2C=C=CH(CH2)nX with n=3-6 have been prepared and reacted with n-Bu3SnH to generate the corresponding radicals for examination of the cyclization reactions of these reactive intermediates.The observed hydrocarbon products indicate that cyclization occurs for the n=3,4, and 5 radicals but not for the n=6 species.The n=3 radical isomerizes very efficiently by intramolecular addition to the sp carbon of the allene group.The n=5 intermediate reacts relatively slowly by attack at the near sp2 carbon.Both cyclization modes are observed for the n=4 species.The details of these radical cyclizations are discussed.
