91969-33-4Relevant academic research and scientific papers
The origin of diastereoselectivity in cyclopropanation reactions of the iron carbene complex [(η5-C5H5)(CO)2Fe=CH[(η6-o-CH3OC6H4)Cr(CO)3]](1+)
Wang, Qinwei,Hossain, M. Mahmun
, p. 751 - 754 (2001)
The origin of diastereoselectivity in cyclopropanation reactions of the iron carbene complex [(η5-C5H5)(CO)2Fe=CH[(η6-o-CH3OC6H4)Cr(CO)3]](1+) has been investigated. The chromium participation has been proved by the upfield shifts of both 1H- and 13C-NMR for Cα-H and Cα, which stabilized the iron carbene and may result in a late transition-state for the cyclopropanation reaction via tricarbonylchromium-complexed iron carbene. Hence, trans selectivity is expected. However, when using aromatic alkenes, a ? stacking effect may exist during the transition-state, resulting in the cis selectivity for cyclopropanation.
