Sulfuranes, heterocyclic

Heteroaromatic sulfoxides and sulfones ligand exchange and coupling in sulfuranes and //Avo-substitutions, 49, 1 Heteroaromatic systems, Claisen rearrangements in, 42, 203 Heteroaromatics, quantitative analysis of steric effects in, 43, 173 Heterocycles aromaticity of, 17, 255 chiral induction using, 45, 1 containing the sulfamide moiety,... 

The chemistry of 7r-hypervalent heterocyclic systems is one of the important fields in that of hypervalent compounds. A number of 7r-electron systems containing a 10—S—3 framework have been prepared, and their structures and reactivities have been investigated [79]. In general, all atoms bonded to central atom in 7r-sulfuranes such as trithiapentalene are in the same plane. The equatorial bond has the characterization of a double bonding system and the two apical bonds are a 3-center 4-electron bond. As the sp2 type carbon atom or heteroatom having a lone electron pair is located in the two five-membered ring systems, a 1271 conjugated system is constructed and plays an important part in the stability of 7r-sulfurane. 

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