Rh(II) acetate effectively catalyzed the hydrosilylation of enamides, N-vinylurea, and imides to give N-(silylalkyl)amide derivatives in moderate to high yields. The silyl group was selectively introduced to the carbon atom adjacent to the nitrogen atom, whereas the efficiency and regioselectivity of the Rh-catalyzed hydrosilylation of vinyl carboxylates, thiocarboxylates, ethers, and thioethers were highly affected by the substitution patterns of the substrates and reaction conditions. The reaction of N-vinylphthalimide (1f) with deuteriosilane suggests that the catalytic process involving the oxidative addition of hydrosilane and migratory insertion of the alkenyl group of 1f is reversible. The molecular structures of the N-(1-silylethyl)phthalimide 2f and N-(1-silylethyl)acetamide 2k species have been determined by X-ray analyses. The results show that there is no intramolecular interaction between the silicon atom and the oxygen atom of the carbonyl groups of 2f and 2k.

Uphill transport of ammonium ions through a membrane with sulfonic acid groups were investigated with pH-controllers which keep the solution at a constant pH. A membrane with sulfonic acid groups was prepared by casting an aqueous solution containing poly(styrenesu1fonic acid) and poly(viny1 alcohol) on a glass plate. When a membrane with one side alkaline and the other acidic was fixed as a diaphragm in a cell, ammonium ions were transported from the alkaline side to the acidic side through the membrane against the concentration gradient of the adjacent solutions. Uphill transport of ammonium ions with pHcontrollers was more efficient than without, thus keeping the pH difference between both sides of the membrane constant, which is a driving force for the uphill transport. Furthermore, the effect of pH of the acidic side on the uphill transport was investigated and the mechanism of the pHcontrolled uphill transport is discussed.

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Synthesis and Structure of N-(Silylalkyl)amides: Rhodium-Catalyzed Hydrosilylation of Enamides.-A new synthesis of title compounds by Rh-catalyzed hydrosilylation of olefins attached to N-, O-, and S-containing functional groups is presented. The reaction course of vinyl carboxylates, thiocarboxylates, vinyl ethers and vinyl sulfides is highly dependent on the substrates, catalysts and solvents. -(MURAI, T.; KIMURA, F.; TSUTSUI, K.; HASEGAWA, K.; KATO, S.; Organometallics 17 (1998) 5, 926-932; Dep.