Carbanions as Intermediates in the Formation of Grignard Reagents
作者:Gerard P. M. van Klink、Henricus J. R. de Boer、Gerrit Schat、Otto S. Akkerman、Friedrich Bickelhaupt、Anthony L. Spek
DOI:10.1021/om011083a
日期:2002.5.1
convincingly explained by invoking the intermediate formation of the highly reactive carbanion R:-, which may in some cases be slightly stabilized by formation of an (intra- or intermolecular) stannate (or silicate) complex. Another serious candidate for such migrations would have been the radical R•, the occurrence of which is well-documented in Grignard reactions. However, this alternative route could
Development of the “Diverted Heck” Reaction for the Synthesis of Five-Membered Rings
作者:Kevin Breitwieser、Peter Chen
DOI:10.1021/acs.organomet.1c00025
日期:2021.3.22
The “diverted Heck” reaction has been shown to be a potent method to synthesize cyclopropanes from electron-rich olefins and iodomethyl trifluoroborate. Nevertheless, it is not mechanistically limited to the three-membered rings. The synthesis of five-membered rings using bifunctional substrates with a halide moiety and an organometallic group is described. Furthermore, the reactions of the respective