CLAYS DIRECT AROMATIC NITRATION

The influence of kaolinite on the nitration of 1 appears not to involve intercalation: the increase from 1% to 27% in the yield of 3 at the expense of 2 during nitration in the presence of a solid support is instead a consequence of the fact that the CO leaving group is protonated as it is adsorbed onto the strongly acidic surface of the clay mineral. This in turn leads to considerable stabilization of the reaction intermediate. (Figure Presented.) Copyright © 1990 by VCH Verlagsgesellschaft mbH, Germany