Y. Kai, N. Yasuoka, N. Kasai
Nov 1, 1972
Citations
0
Influential Citations
5
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
The molecular structure of a stereospecific (isotactic) polymerization catalyst of the acetaldehyde-monomer-Lewis acid complex, [Me2Al·O·CPh:NPh,MeCHO,AlMe3], has been determined from three-dimensional X-ray-diffraction data collected photographically. The crystal belongs to the monoclinic system (space group P21⁄n), with four formula units in a cell with dimensions of: a=13.60(3), b=13.74(2), c=12.40(2) A, 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”.