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European Polymer Journal | 1967

Catalytic regular polymerization of propadiene and alkylpropadienes

Sei Otsuka; Kan Mori; T. Suminoe; Fumitake Imaizumi

Abstract Catalytic linear polymerizations of propadiene, 1,2-butadiene, and 3-methyl-1,2-butadiene were achieved with low-valent-nickel complexes as homogeneous catalysts. Interaction of propadiene with some iron, cobalt, and nickel complexes produced propadiene complexes of various stabilities. Isolated complexes involving metal-stabilized-radical-ligands were noted as the possible initiating species. Labile propadiene complexes of Ni(O) and Co(O) atoms are generally active for the catalytic polymerizations. Several factors determining the catalytic activities were discussed. The i.r. and NMR spectra revealed that the polymers obtained with the nickel catalysts are of quite regular structures. The polymer structures of asymmetrically substituted propadienes suggested that a regular propagation takes place preferentially at the unsubstituted double bond which participates in the co-ordination to metal.


Kobunshi Ronbunshu | 1965

The Chemistry of Diene Polymerization

Seinosuke Otsuka; Tatsuhiko Kikuchi; Yasuyuki Tanaka; Fumitake Imaizumi; Kan Mori

金属カルボニル類 (Fe (CO) 5, Ni (CO) 4, Co2 (CO) 3) とアルミニウム化合物 (Et3Al, Et2AlCl, EtAlCl2, AlBr3) との組合せ触媒によるブタジエンの重合とともに, これら組合せ触媒自体を赤外スペクトル, ガソメトリーで調べ, 触媒の活性ならびにポリマーの立体規則性について検討した。金属カルボニル類とEt3Alの系はオリゴマーを生成し, Et2AlCl, EtAlCl2の系は高重合活性を示し, それぞれのアルミニウム化合物-金属カルボニルの組合せにより異なった程度の立体規則性を示す。AlBr3との系は多くの場合, 典型的カチオン重合であるが, モノマー存在下の熟成により立体規則性重合をすることがある。Fe (CO) 3BD-AlBr3ではシスポリマーが得られる。上記触媒系の重合活性と立体規則性は, 遷移金属のみ, あるいはアルミニウム化合物のみ, さらにはAl/遷移金属比のみで決まるのではない。触媒活性とAl/遷移金属比との間には極大点があり, この最適比はそれぞれ特定の遷移金属-有機アルミニウム化合物の組合せによって決まる。特定の金属の電子構造にそれぞれ適する配位子場作用を示す配位子をもってくることが触媒活性ならびにその立体規制力を発揮するのに必要と思われる。


Journal of the American Chemical Society | 1965

Crystalline 1,2-Polyallene

Sei Otsuka; Kan Mori; Fumitake Imaizumi


Journal of Organic Chemistry | 1966

Coordination Effects in Organic Reactions. I. A Novel Preparation of t-Alkyl Isocyanide Complexes by N-Alkylation of Hydrogen Cyanide

Sei Otsuka; Kan Mori; Kikuo Yamagami


Journal of Polymer Science Part B: Polymer Letters | 1965

Structure of crystalline polyallene

Hiroyuki Tadokoro; Yasuhiro Takahashi; Sei Otsuka; Kan Mori; Fumitake Imaizumi


Archive | 1976

Catalytic production of a high molecular weight cis-1,4-polyisoprene

Kan Mori; Hiroharu Ikeda; Isao Nagaoka; Tooru Shibata; Sigeo Kawatani; Tatsuhiko Kikuchi


ChemInform | 1976

DIMERIZATION OF ISOPRENE WITH TITANIUM CATALYST

Fumitake Imaizumi; Shigetoshi Hirayanagi; Kan Mori


ChemInform | 1975

PREPARATION OF ALKYL BETA-ALKOXYPROPIONATES FROM ALPHA,BETA-UNSATURATED ALDEHYDES AND ALCOHOLS

Fumitake Imaizumi; N. Ando; Kan Mori


ChemInform | 1974

SYNTHESIS OF PARTIALLY HYDROGENATED ISOPRENE DIMERS

Fumitake Imaizumi; Naoki Ando; Shigetoshi Hirayanagi; Kan Mori


Archive | 1969

CATALYTIC PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT CIS-1,4-POLYISOPRENE

Kan Mori; Taro Suminoe; Tamotu Yamazaki; Tunezo Ishikawa; Akira Kogure

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