79340-56-0Relevant articles and documents
Intermolecular Migration of Silyl Groups in (Trimethylsiloxy)enones
Reetz, Manfred T.,Neumeier, Guenther
, p. 1234 - 1243 (2007/10/02)
Crossover experiments prove that the silyl groups in quadratic acid bis(trimethylsilyl ester) (1) undergo rapid intermolecular migrations.This causes the two 13C-NMR signals of the fourmembered ring, which appear at 35 deg C as singlets, to coalesce at 83 deg C and to reappear as a single signal above 170 deg C.The activation energy amounts to 16.9 kcal/mol.Other bis(silylated) ketoenols 2,3,4, and 5 show no dynamic effects; nevertheless, they rearrange intermolecularly.