15N nuclear magnetic resonance studies of azabicycles; unusual deshielding of nitrogen in the 7-azabicyclo[2.2.1]heptyl ring system
作者:Djballah Belkacemi、John W Davies、John R Malpass、Antoinette Naylor (née Bathgate)、Craig R Smith
DOI:10.1016/s0040-4020(01)89045-1
日期:——
samples of derivatives of the 7-azabicyclo[2.2.1]heptyl system were synthesised and 15N NMR spectra were recorded using 15N-enriched and natural abundance samples; separate signals were observed for the two invertomers in N-methyl and N-chloro derivatives. Considerable deshielding was observed in comparison with simple amines and with 8-azabicyclo[3.2.1]octyl and 9-azabicyclo[4.2.1]nonyl analogues.