1,2-Thiazines and benzo derivatives

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Sulfur atoms can exhibit a valency of four allows the formation of 1-substituted 1, 2-thiazines with a double bond between two heteroatoms, and the second bond elsewhere in the ring. Although these compounds could be described as “dihydro derivatives,” they are isomeric with 1, 2-thiazines, in which the valency of the sulfur atom is two and there is no double bond between the heteroatoms. The compounds of 2H- and 3H, 6H-1, 2-thiazines and bicyclic 1, 2-thiazines are discussed. The literature containing the thermal stability of N-chlorosulfenyl-N-trimethylsilyl alkylamines increases with the size of the alkyl group. When thermolysed these compounds generate the corresponding N-sulfides (alkylN=S), which can be trapped by dienes—such as 2, 3-dimethyl-1, 3-butadiene, to give the 3, 6-dihydro-2H-1, 2-thiazines. These compounds are discussed with structural diagrams. The 1, 2-disposition of heteroatoms allows several different types of ring fusions for the general class of compounds containing benzo-1, 2-thiazines are briefly explained.
Original languageEnglish
Title of host publicationSecond Supplements to the 2nd Edition of Rodd's Chemistry of Carbon Compounds
Subtitle of host publicationA Modern Comprehensive Treatise
Number of pages20
Publication statusPublished - 1991


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