Polymerization of amino acid derivatives by polymer catalysts. II. Polymerization by copolymer catalysts containing a tertiary amine as a component

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Abstract
The polymerizations of D,‐Lβ‐phenylalanine NCA, p–nitro‐D,L‐β‐phenylalanine NCA, and o,p‐dinitro‐D,L‐β‐phenylalanine NCA were investigated, homopolymers and copolymers of N‐vinyl‐2‐ethylimidazole or 2‐Vinylpyridine being used as catalysts. When N‐vinylpyrrolidone and N,N‐diethylacrylamide, which are capable of forming hydrogen bonds with the NCA's, were used as comonomers with N‐vinyl‐2‐ethylimidazole, the copolymer catalysts were found to bring about a faster polymerization than poly‐N‐vinyl‐2‐ethylimidazole. However, when styrene, which has no particular interaction with the NCA's, was used as a comonomer with 2‐vinylpyridine, the copolymer catalyst was found to give a slower polymerization than poly‐2‐vinylpyridine. Electronic spectroscopy showed that the charge‐transfer complex between copolymer catalysts and the NCA's plays an important role in the polymerization. The experimental results are discussed in terms of the effectiveness of the copolymer catalysts for forming hydrogen bonds or charge‐transfer complexes with the NCA's.

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