Understanding the Formation of N−H Tautomers from α-Substituted Pyridines: Tautomerization of 2-Ethylpyridine Promoted by Osmium
作者:María L. Buil、Miguel A. Esteruelas、Karin Garcés、Montserrat Oliván、Enrique Oñate
DOI:10.1021/ja073673r
日期:2007.9.1
Reaction of [OsH((eta)2-H-2)(eta)2-C,C-kappa(1)-N-(CH2=CH-o -C5H4N)} (P-i Pr-3)(2)]BF4 with benzophenone affords [OsH2kappa(2)-C,O-C6H4C(O)Ph}kappa-C-(HNC5H3Et)}(P-i Pr-3)(2)]BF4 as a result of the orthometalation of the ketone, the hydrogenation of the vinyl substituent of the pyridine, and its subsequent tautomerization. In acetonitrile, the ketone is released and complex [OsHkappa-C-(HNC5H3Et)}(NCCH3) (P-i Pr-3)(2)]BF4 is formed.