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Polymerization of amino acid derivatives by polymer catalysts. I. Polymerization by poly‐2‐vinylpyridine
Author(s) -
Suzuoki Kazuhiro,
Imanishi Yukio,
HigaShimura Toshinobu,
Okamura Seizo
Publication year - 1969
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1969.360070607
Subject(s) - chemistry , polymerization , polymer chemistry , catalysis , pyridine , polymer , copolymer , nitro , chain transfer , organic chemistry , radical polymerization , alkyl
Polymerizations of D , L ‐β‐phenylalanine, p ‐nitro‐ D , L ‐β‐ phenylalanine, and o , p ‐dinitro‐ D , L ‐β‐phenylalanine NCA's were carried out with the use of α‐picoline or poly‐2‐vinyl‐pyridine as initiator. Polymerizations induced by the polymer catalyst were always faster than those with α‐picoline in the same base concentrations. Furthermore, the polymer effect was more marked when the number of nitro groups in the NCA's increased. It was considered that the polymer catalyst interacts with the NCA's primarily by hydrogen bonding and increases the effective concentration of NCA along the chain. The increase of the NCA concentration in the vicinity of the polymer catalyst wits also achieved through charge‐transfer complexes between nitrophenyl groups in the NCA's and pyridine groups in the polymer catalyst. As the polymer chain is flexible, a collision between an adsorbed NCA and a pyridine unit in the same polymer chain is favored, thus increasing the polymerization rate.