Transformations of <i>F</i>-Alkyl Iodides and Bromides Induced by Nickel(0) Carbonyl
作者:Carl G. Krespan、David A. Dixon
DOI:10.1021/jo970805y
日期:1998.1.1
Adducts of primary F-alkyl iodides with nickel carbonyl are formed readily in donor solvents and pyrolyze at 100-150 degrees C to give olefinic coupling products in high yield. The mechanism proposed to account for the observed chemistry involves preferential alpha-elimination of fluorine with formation of a carbenoid species complex coordinated to nickel. Differences in reaction paths among several types of substrate halides are rationalized on the basis of polarization of the Ni-C bond in the adducts, Support for these proposals is provided by state-of-the-art calculations.