Preparative Organic Chemistry
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ChemInform Abstract: The Cope Rearrangement of 1,5-Dimethylsemibullvalene-2,6- and 3,7-dicarbonitriles in the Solid State.
First published: May 30, 1989
ChemInform Abstract
Solid-state 13C NMR unequivocally establish the existence of rapidly equilibrating valence tautomers of both the known crystalline α-form and a second form (β) of (Ia)/(IIa) and of (Ib)/(IIb) as well, whereas X-ray crystallography of (Ia) (β-form, space group P21/a with Z=4) appear to favor the existence of structures intermediate between (Ia) and (IIa).
