Electronic effect of and mutual polarizability in groups attached to oxygen via their C, Si, Ge, and B atoms

Abstract

Relative acidity of triphenylhydroxy substituted germane and stannane is consistent with superior electrondonating effect of (C6H5)3Ge and (C6H5)3Sn groups in these compounds. Relative basicity data of alkyl(alkoxy) boranes, methanes, silanes, and germanes (RO)nZRm (Z = B, C, Si, and Ge) are compiled. The variation of the electronic effect parameter σ of fully alkylated RmZ-groups upon substitution of their alkyl with ethoxy substituent appears for Z=B and Si to be influenced by mutual polarizability effect of ethoxy substituents. Mutual polarizability of ethoxy substituents attached to carbon and germanium is negligible.