Oligomerization of Vinyl Monomers. 2. Evidence for a conformationally restrained six-membered ring containing lithium ion

C Mathis, TE Hogen-Esch

Index: Mathis, C.; Hogen-Esch, T.E. Journal of the American Chemical Society, 1982 , vol. 104, # 2 p. 634 - 635

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Citation Number: 21

Abstract

4x 4Y providing an asymmetric environment at the reacting carbani~ n. z~-~ We now wish to report evidence for such a scheme involving the addition of 2-vinylpyridine (2-VP) to anions 1-3 at-78 OC in THF and sequential methylation according to reaction 1. Previous~~ rk~~,~ had indicated a very highly stereoselective (> 99%) methylation of 4, yielding meso 7. The corresponding methylation in the presence of larger or cryptated and crowned cations had ...