Tetrasulphur tetranitride

Reaction of tetrasulphur tetranitride antimony pentachloride complex (S4N4.SbCl5) with a series of primary (3-enaminones and P-enamino esters 79 in toluene at 100 °C gave reasonable yields of 3,4-disubstituted 1,2,5-thiadiazoles 80. The formation of 80 was explained by the same mechanism as that proposed for the formation of 1,2,5-thiadiazoles from 3,5-disubstituted isoxazoles with S4N4.SbCl5 complex <00H159>. 

Tetrasulphur tetranitride, N4S4, is produced when dry NHg is passed into a solution of SgClg in dry ether, separating as orange crystals, m.p. 178°. 

When tetrasulphur tetranitride (p. 338) at low pressure is heated to 300 the ring is broken and a polymer, (SN) , is produced as fibrous crystals with a metallic lustre. The material, which is a semi-conductor, probably has the structure ... 

Since decomposition of tetrasulphur tetranitride with alkali gives ammonia, and reduction with stannous chloride followed by decomposition with alkali also gives ammonia, there canbe no NN links in molecule. 

When a 2-halophenoI is heated with (the explosive) tetrasulphur tetranitride, both substituents are usually displaced and a thiadiazole ring is formed, but exceptions to this rule are observed, for example, 4-t-butyl-2-chlorophenol gives 6 t-butyl-4-chloro-2,I,3-benzothiadiazole as the major product (56% yield) and... 

Phenols which are unsubstituted at C-2 and/or C-6 are cyclized by heating with the explosive tetrasulphur tetranitride. 2-Naphthol also gives a high yield of the... 

Nitroxides, Hydroxylamines, and Nitroso- and Nitro-compounds. The chemistry of the magic radical , bistrifluoromethyl nitroxide, and related compounds particularly (CF3)jN OH and [(CFj),N O],Hg has been dealt with at some length in the review literature full details of the work on reactions between (i) the nitroxide and tetrasulphur tetranitride -> N4S4[O N(CF8)2]4, also obtainable from (CFj),N-0- + N4S4H4 or N3S3CI3 and [(CF3)jN-0]jHg + N3S3CI3, (ii) the mercurial [(CF3)3N-0]3Hg and thiazyl fluoride - ... 

Decahydroazecines (454) and (455) are described, and the reaction of tetrasulphur tetranitride with norbomene has been shown to yield the exo-cis structure (456), elucidated by i.r., n.m.r., and u.v. studies. Compounds (457) and (458) are other ten-membered ring heterocyclic structures described this year. ... 

Studies which have involved Lewis acid-base adducts of organoboranes include the following the adducts of phenyl boron dichloride with tetrasulphur tetranitride, dibromomethylborane and bromodimethylborane with pyridine, 4-methylpyridine, trimethylamine and trimethylphosphine, monoalkylboranes with A AWW -tetramethylethylenediamine, diethylboron esters of alkane-nitronic acids with pyridine, and triarylboranes with guanidine,urea, methylurea, and thiourea. ... 

Further additions to norbornenes are extensively reported. Tetrasulphur tetranitride adds to norbornene and to norbornadiene and structure (116) is proposed for the adduct of norbornene. However, structure (117) or even... 

Liquid ammonia solutions. Sulphur and tetrasulphur tetranitride (S4N4) 245... 

Ditosylsulphurdi-imine acts as an oxidizing agent, converting hydro-quinone into quinone, thiophenol into diphenyl disulphide, hydrazobenzene into azobenzene, and 1,4-dihydronaphthalene into naphthaiene." The same di-imine reacted with dimethylaminotrimethylstannane such that the latter reagent added separately across each S=N bond. The same reagent reacted with tetrasulphur tetranitride to form the di-imine (131), which reacted with... 

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