Synthesis of Thiamacrocycles and Conformational Studies on Their Precursors
作者:Rudolph A. Abramovitch、Xiaocong Ye、William T. Pennington、George Schimek、Dariuz Bogdal
DOI:10.1021/jo991139z
日期:2000.1.1
NMR. In the solid state, 1 and 2 exist in the staggered, linear conformation, stacked head-to-tail, with the plane of the nitro group being tilted above the plane of the benzene ring. It appears that the crystal lattice forces overcome the weak edge-to-face intramolecular aromatic interactions that dominate in the gas phase and in solution. The corresponding azides were treated with trifluoromethanesulfonic