The Crystal Structure of the Polymerization Catalyst of Acetaldehyde and Its Derivatives. IV. The Crystal and Molecular Structure of Dimethylaluminum <I>N</I>-Phenylbenzimidate-<I>O</I>-(Trimethylaluminum)-Acetaldehyde Complex, [(CH<SUB>3</SUB>)<SUB>2</SU

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概要

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• The molecular structure of a stereospecific (<I>isotactic</I>) polymerization catalyst of the acetaldehyde-monomer-Lewis acid complex, [Me<SUB>2</SUB>Al·O·CPh:NPh,MeCHO,AlMe<SUB>3</SUB>], has been determined from three-dimensional X-ray-diffraction data collected photographically. The crystal belongs to the monoclinic system (space group <I>P</I>2<SUB>1</SUB>⁄<I>n</I>), with four formula units in a cell with dimensions of: <I>a</I>=13.60(3), <I>b</I>=13.74(2), <I>c</I>=12.40(2) Å, β=95.9(2)°. The structure was solved by the heavy-atom method and was refined by the block-diagonal, least-squares procedure. The trimethylaluminum forms a bond with the electron-rich oxygen atom of acetaldehyde through the electron-deficient aluminum atom. The polymerization mechanism can reasonably be concluded to be the “co-ordinated cationic polymerization”.

著者

• Kai Yasushi

  Department Of Applied Chemistry Faculty Of Engineering Osaka University

• Kasai Nobutami

  Department Of Applied Biological Science Tokyo University Of Science

• Yasuoka Noritake

  Department Of Life Science Faculty Of Science Himeji Institute Of Technology

• Kakudo Masao

  Institute for Protein Research Osaka University

• Yasuoka Noritake

  Department of Applied Chemistry, Faculty of Engineering, Osaka University

• KAKUDO Masao

  Institute for Protein Research, Osaka University

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