Chemistry of hop constituents. Part 42. The formation and characterisation of sesquiterpene episulphides in the essential oil of hops

Abstract

The novel episulphides, humulene-1,2- and -4,5-episulphide and caryophyllene-4,5-episulphide, identified as components of hop oil, particularly that from hops treated with sulphur during the growing season, have been prepared under very mild conditions by the u.v.-promoted addition of sulphur to the sesquiterpenes, and have been characterised largely by i.r. and 1H n.m.r. spectroscopy.