Selenium and Tellurium Heterocycles

Synthesis of optically active selenium and tellurium heterocycles and their application for asymmetric synthesis 97OPP603. 

Alternative methods for the preparation of selenals and selones which could be applied to the synthesis of related selenium and tellurium heterocyclic systems have been recently reviewed <2005COFGT-II(3)397>. 

The three synthons E(NSO)2 (E = S, Se, Te), although isostructural, differ significantly in their chemical behavior, due mainly to the varying stability of the intermediates formed in their reactions. Specifically, the compounds Se(NSO)2 and Te(NSO)2 have enabled new procedures for the synthesis of selenium and tellurium heterocycles to be developed. For compounds such as X2Te(NSO)2 (X = F, Cl), it would be interesting to know if these compounds are also able to eliminate S02 and if so, how, inter- or in-tramolecularly. As the reaction pathways are not fully understood, more significant experimental work is needed. 

Selenides of selenophene series, synthesis and reactivity 72KGS723. Selenium and tellurium heterocycles, derivatives of carboxylic acids ... 

E. Selenium and Tellurium Heterocycles 1. General Sources and Topics Se-Containing heterocycles 97UK1025. 

Heterocyclic Chemistry is an annual publication which combines material previously reviewed in three separate SPR titles Saturated Heterocyclic Chemistry, Aromatic and Heteroaromatic Chemistry, and the heterocyclic sections of Organic Compounds of Sulphur, Selenium, and Tellurium. Heterocyclic Chemistry has now reached its fourth volume, which reviews the literature published on the subject during the period July 1981 to July 1982. 

---