Pseudorotation in arylbis (4, 4'-dimethyl-2, 2'-biphenylylene) phosphoranes

GM Whitesides, M Eisenhut…

Index: Whitesides,G.M. et al. Journal of the American Chemical Society, 1974 , vol. 96, # 17 p. 5398 - 5407

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Citation Number: 48

Abstract

Abstract: Examination of the temperature dependence of the proton nmr spectrum of 2- isopropylp, henylbis (4, 4'-dimethyl-2, 2'-biphenylylene) phosphorane (1) suggests that pseudorotation of this compound does not occur by a simple Berry process but rather by a mechanisminvolving a square pyramidal intermediate (Scheme I). The permutation of the 4- and 4'-biphenylylene sites resulting from this intermediate is the same as that which would ...