5*66DITHIOCALICENE DERIVATIVE AND ITS PREPARATION

摘要

NEW MATERIAL:The compound I (R1'2 are (substituted) hydrocarbon group, heterocyclic group, e.g. alkyl, cycloalkyl, aryl, furyl, benzimidazolyl, etc.). EXAMPLE:5,6-Dimethylthiocalicene. USE:Raw material of various chemicals. PROCESS:The compound I is prepared by reacting 1 mole of dithiodihalocyclopropene II (X is halogen) with 2 moles of cyclopentadiene, in a solvent such as methylene chloride, THF, DMF, etc., at -100-0 deg.C (usually about -70 deg.C) for 5 min-2 hours (usually 10 min to 1 hour). To carry out the reaction smoothly, it is recommended to react cyclopentadiene with a base (e.g. NaH, K, etc.) before reacting with the compound II.