Hexamethylene Tetramine Hyorotribromide Mediated Regioselective Cyclisation of<i>Ortho</i>- Cyclohexenyl Phenols^#

Abstract

Abstract Hexamethylene tetramine hydrotribromide is found to be superior to pyridine hydrotribromide when compared with the rate of reaction and chemoselectivity for the regioselective cyclisation of a number of ortho-cyclohexenyl phenols 1 (a-j) to 3-bromo-2, 4-propano-chromans 2 (a-j).