Abstract
The reactivity of several products R1R2CH-X+,1, (X=N,P,S), which can produce ylids by reaction with bases, has been tested using the activated barium hydroxide catalysts, C-200. Wittig-Horner, Wittig, Corey-Chaykovsky and Kröhnke type reactions have been analyzed. The pKa of 1, and the structure of active sites control the process. When 1 has a strong acid character, the process takes place -dissolving the solid- in homogeneous phase. When 1, has pKa va1ues < 11, the process takes place in the strong basis sites of the solid (pKa > 11.7), that control the reaction mechanism and the reactivity of adsorbed ylids.
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