Sulfur-Nitrogen Heterocycles

T. Chivers, Electi on-Rich Sulfur-Nitrogen Heterocycles, Acc. Chem. Res., 17, 166 (1984)... 

T. Cbivers, Sulfur-Nitrogen Heterocycles, in I. Haiduc and D. B. Sowerby (ed.) The Chemistry of Inorganic Homo- and Heterocycles, Academic Press, London, Vol. 2, pp. 793-870 (1987). 

I. Haiduc, The Chemistry of Inorganic Ring Systems, Part 2, (sulfur-nitrogen heterocycles), pp. 909-83, Wiley, London, 1970. 

R. T. Oakley, Sulfur-Nitrogen Heterocycles, Progr. Inorg. Chem. 1988, 36, 299-391. 

T. Torroba, Poly(sulfur nitrogen) heterocycles via sulfur chlorides and nitrogen reagents, J. Prakt. Chem., 1999, 341, 99. 

Sulfur/sulfur-nitrogen heterocycles, 9 289 Sulfur tetrafluoride, 77 863 Sulfur trioxide, 23 515, 517-520, 525, 661, 754-801... 

Sulfur-nitrogen heterocycles provide the most commonly encountered examples of interactions involving inorganic ring systems. For example,... 

Emission from Complexes of Sulfur-Nitrogen Heterocyclic Ligands. 40... 

Various sulfur-nitrogen heterocycles can serve as a source of 1,2,3-dithiazolyl radicals. The thermolysis of benzo-trithiadiazepin 158 and dibenzotetrathiadiazecine 159 in hydrocarbons afforded the 1,2,3-benzodithiazolyl radical 15 (Scheme 30) <2003MG178>. 

There was no loss in flavorant at a 100 mg level when either whole soy or soy 7S protein was used, but there was a 14-24 percentage loss when 11S protein was used. Only soy 11S protein affected the substituted pyrazine content of the mixture at all addition levels. The higher the substituted pyrazine congener, the smaller was the percentage loss with any of the protein types. At the 500 mg level, only about 50% of the amount of any of the methyl pyrazines in the control was recovered from either soy 7S or 11S protein while 70% was recovered from whole soy protein. These results greatly extend the initial work reported by Palkert and Fagerson (11J who determined that about 75% of dimethyl thiazole, a sulfur-nitrogen heterocycle, was recovered from dry, textured soy protein. 

A comparative study on the reactivity of the methylene hydrogen atoms in sulfur-nitrogen heterocycles towards an electrophilic reagent as exemplified by their reactions with aldehydes was undertaken. It was found that the reactivity decreased in the order of 249a > 35 > 502 > 503. Compound 504 is as unreactive as 503. This clearly demonstrates that the... 

While the eight-membered ring proved to be an excellent precursor for the synthesis of oxygen-containing sulfur-nitrogen heterocycles with nu-cleophUes, as well as electrophiles, the five-membered rings have shown Lewis basicity on various substrates. 

The best-known cyclic sulfur imides are saturated sulfur-nitrogen heterocycles, which are derived from cycler Ss by the replacement of one or more sulfur atoms by an amido (NH) group. Derivatives containing adjacent NH groups are not found. Thus, the members of this series consist of S7NH (70), three diimides 1,3-, 1,4- and 1,5-S6(NH)2, two triimides 1,3,5- and 1,3,6-85(NH)3, and S4N4H4 (71). 

Keywords Ninhydrin, malononitrile, aryl isothiocyanates, primary aliphatic amines, ethanol, triethylamine, room temperature, one-pot multicomponent synthesis, thio-Michael and Knoevenagel reactions, sulfur-nitrogen heterocycles, oxathiaaza[3.3.3]-propellanes, che-moselectivity, regioselectivity... 

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