Unequivocal existence of a centrosymmetr
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Kimiaki Yamamura; Naoki Kusuhara; Yuuko Houda; Misako Sasabe; Hideki Takagi; Mas
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Article
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1999
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Elsevier Science
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French
⚖ 192 KB
Unequivocal existence of a centrosymmetric associated dimer of the title compound 1 formed by C-H.. • O=C hydrogen bonds was found by X-ray crystallography. The occurrence of this hydrogen bond, as well as the observed reduction of the bond-length alternation in the seven-membered ring of 1, is unde