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SHORT COMMUNICATIONSWe perform systematic studies on reactions of new electrophilic reagents, selenium dichloride and selenium dibromide [1][2][3][4][5], with divinyl chalcogenides and their derivatives. Selenium dihalides react with divinyl sulfide to form 2,6-dihalo-1,4-thiaseleninanes and 5-halo-2-halomethyl-1,3-thiaselenolanes [1]. Addition of selenium dihalides to divinyl selenide gives 4-halo-2-halomethyl-1,3-diselenolanes [2]. By reaction of selenium dihalides with divinyl sulfone we obtained 2,4-bis(halomethyl)-1λ 6 ,3-thiaselenetane and 5-halo-2-halomethyl-1λ 6 ,3-thiaselenolane 1,1-dioxides [3]. In the reaction of selenium dibromide with divinyl ether bis(1,2-dibromoethyl) ether was formed as a result of bromination of both double bonds [4]. Reactions of selenium halides with vinyl tellurides were not reported.We examined the reaction of selenium dichloride with divinyl telluride. Unlike other divinyl chalcogenides, no addition products at the double bond were obtained, while the only product was previously unknown dichloro(divinyl)tellurium (I) which was formed in quantitative yield. tivity, and neither heterocyclic compounds nor addition products at the double bond were detected.Thus the direction of reactions of selenium dihalides with divinyl chalcogenides is largely determined by the chalcogen nature. In the reaction with divinyl telluride, selenium dichloride acts as selective chlorinating agent for tellurium. This is the first example of reactions between compounds containing a selenium-halogen bond and vinyl tellurides.

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