Evidence for a nonclassical structure of a 1,6-methano[10]annulene: A cryogenic¹³C CPMAS NMR study of the 11,11-dimethyl derivative

High-resolution 13C NMR spectra obtained using cryogenic CPMAS methodology at temperatures as low as 10 K suggest that the structure of 11,11-dimethyl-1,6-methano[10]annulene is nonclassical. © 1994 American Chemical Society.