Heterocyclization of Olefins with Sulfur in Ultrasonic Cavitation Field

Abstract

The interaction of α-alkenes, styrene, methylstyrene with elemental sulfur (S₈) in an ultrasonic cavitation field in the exposure mode of 22 kHz, 30 W was studied. It has been shown that under conditions of ultrasonic cavitation, active radical ions ⁺S^• and biradicals ^•S^• are formed. New directions for the reaction of alkenes with S₈ under these conditions have been discovered: the hydrogenation of alkenes occurs parallel to the sulfurization process. The reaction of S₈ with α-olefins under the influence of ultrasound affords 4-alkyl-1,2,3-trithiolan-5-thiones, 2,5-dialkylthiophenes, and alkanes; with styrene—2,4-diphenylthiophene; with methylstyrene—4-phenyltrithione.