H. Kageyama, Y. Yanagisawa, N. Kasai
May 1, 1984
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Influential Citations
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Journal
Macromolecular Chemistry and Physics
Abstract
The molecular structures of (RS)-1,2,2,2-tetraphenylethyl methacrylate (TrBzMA) and (1S, 2R)-(+)-1-benzyl-3-dimethylamino-2-methyl-1-phenylpropyl methacrylate (ChMA) were determined by means of X-ray diffraction: (RS)-TrBzMA .0,5C6H6; triclinic, space group P1, a = 9,271(2), b = 33,965(4), c = 9,167(2) A, α = 90,26(2), β = 118,80(2), γ = 88,03(2)°, and Z = 4; ChMA; monoclinic, space group P21, a = 12,482(1), b = 9,184(1), c = 9,246(1) A, β = 93,49(1)°, and Z = 2. Both structures were solved by the direct method and refined by the block-diagonal least-squares procedure to R = 0,054 and 0,057 for non-zero reflections, respectively. Both of the two crystallographically independent molecules of TrBzMA have the same structure; each molecule has a synperiplanar (sp) conformation as to the CC and CO double bonds about the C(1)C(2) bond and also an sp conformation as to the CO and CO bonds about the C(1)O(1) bond. The ChMA molecule has an antiperiplanar (ap) and a sp conformation about the C(1)C(2) and C(1)O(1) bonds, respectively.