By the addition. oftrimethylchlorosilane. whieh reacts with basie by-producrts. the reaction mixturc is kept neutral. This completely prevents base-czatalyzed side reactions such as {t- eliminationi; and Claisen-or Dieckmann-condensati0ns. Trimethylchlorosilane has no ettect, however. on side reactions whieh proceed via Free-radical meehanisms.
[Phillipson, Neil; Anson, Michael S.; Montana, John G.; Taylor, Richard J. K. Journal of the Chemical Society - Perkin Transactions 1, 1997 , # 19 p. 2821 - 2829]