Chemistry at the Alkyne–Carbene Intersection: A Metallacyclobutene−η<sup>3</sup>-Vinylcarbene Equilibration
作者:Joseph M. O’Connor、Kim K. Baldridge、Carmen L. Vélez、Arnold L. Rheingold、Curtis E. Moore
DOI:10.1021/ja4039483
日期:2013.6.19
Synthesis of a sterically congested metallacyclobutene complex has led to the first observation of metallacyclobutene-η(3)-vinylcarbene equilibration. The structure of the η(3)-vinylcarbene complex was elucidated by spectroscopy, HRMS, and ab initio computations. The vinylcarbene complex was trapped by reactions with ethyl diazoacetate and (C5H5)Co(PPh3)2 to give cobalt-diene and dicobalt complexes
O'Connor, Joseph M.; Chen, Ming-Chou; Frohn, Michael, Organometallics, 1997, vol. 16, p. 5589 - 5591
作者:O'Connor, Joseph M.、Chen, Ming-Chou、Frohn, Michael、Rheingold, Arnold L.、Guzei, Ilia A.
DOI:——
日期:——
Envelope-Flip Dynamics in CpCo(Diene) Complexes: an ab Initio Quantum Mechanical Study
作者:Kim K. Baldridge、Joseph M. O'Connor、Ming-Chou Chen、Jay S. Siegel
DOI:10.1021/jp992322z
日期:1999.12.1
Ab initio quantum mechanical methods are brought to bear on the problem of syn/anti isomerization of the terminal hydrogens in (eta(5)-C5H5)Co(eta(4)-1,3-cis-butadiene) by an envelope-flip process. The first experimentally determined barrier to pairwise syn/anti interconversion in a group VIII highly substituted metal-diene complex is reported. Remarkable agreement between computational and experimental barriers is obtained. A path of stereoisomerization involving two discrete steps, ring flipping and inversion of pyramidality at cobalt, is elucidated in preference to a planar envelope-flip transition state. These results clarify the stereospecific rearrangement observed in two substituted diene derivatives.
O'Connor, Joseph M.; Ji, Hongli; Iranpour, Mahzad, Journal of the American Chemical Society, <hi>1993</hi>, vol. 115, # 4, p. 1586 - 1588
作者:O'Connor, Joseph M.、Ji, Hongli、Iranpour, Mahzad、Rheingold, Arnold L.