peri-Interactions in naphthalene derivatives. Low temperature nuclear magnetic resonance study of 1,8-bisdimethylamino- and 1-benzylmethylamino-8-dimethylamino-naphthalene
Abstract
The N-methyl signal of 1,8-bisdimethylaminonaphthalene (1) separates into a doublet at –120°, while for 1-benzylmethylamino-8-dimethylaminonaphthalene (2) a different process causes non-equivalence of the NMe2 and CH2Ph groups below –8°. The nature of these processes is discussed and barriers are reported.