種々の側鎖イミダゾール基をもつ重合体の触媒活性度

概要

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The Michaelis-Menten kinetics were observed between cationic substrate: (3-acetoxy-N-trimethylanilinium) iodide (ANTI) and PAHI (polyacryloylhistidine), P [VIm(vinylimidazole)-AA(acrylicacid)] and P [AHA(acryloylhistamine)-MAβA (methacryloyl-B-alanine)]. For the solvolysis of neutral 2,4-dinitrophenylacetate (DNPA) catalyzed by PVIm, PAHA, PAHI and P[AHA-AAm(acrylamide)], the relationships between k_ (the second-order catalytic rate constant) and α_0 (the neutral fraction of pendant imidazolyl group) were as same as those of P[VIm-AAm] and P[VIm-AA], indicating the similar profiles to the sequence distribution of [VIm-VIm] dyad against the VIm content in both copolymers. However, for the solvolysis of cationic [1-(p-N-trimethylammonobenzoyl) benztriazole] iodide (TBTI) catalyzed by P[AHA-MAβA], the k_-α_0 proflle indicated a rapid increase in k_ at α_0=0,5-0.9, conversely it decreased straightly till negative value at α_0>0.9 (pH>8.5) on the other hand, a copolymer compossed of VIm and vinylcarbazole (a strong electron donr) exhibited a large catalytic activity on the methanolysis of tetrachlorophthalic anhydride (an electron acceptor).
山形大学の論文
1981-01-20