Abstract

Two novel monoterpenes, 1 and 2, containing an unusual 1,2-bromochloro vinylic portion, were analyzed to study the influence of ?-substituents on the C-1 and H-1 chemical shifts of the 1,2-dihalo vinylic residue. This study reinforces the validity of the empirical rules based on 13C and 1H NMR spectroscopy as a helpful tool for determining the regio- and stereochemistry of substituted vicinal vinyl dihalides.