Parallel mechanisms for the cycloaromatization of enyne allenes †
作者:Thomas S. Hughes、Barry K. Carpenter
DOI:10.1039/a904369a
日期:——
The Myers–Saito cycloaromatization of enyne allenes is proposed to consist of two parallel mechanisms, one involving a biradical and the other with dipolar character. MCSCF calculations suggest that a nonplanar cyclic allene could be fairly close in enthalpy to the biradical, while the planar zwitterion originally proposed as a possible second intermediate is in fact a transition state for the interconversion