Sulphurdi-imides

S4N4 was further shown to be a versatile starting material, e.g. for the preparation of the sulphurdi-imides (18) and (19). Reactions of A-silyl-imines with S4N4 or S3N3CI8 led to the known di-imide (20). The A-functional di-imides (18) and (20) were used for the synthesis of numerous novel heterocycles containing the -N=S=N— functional group, e.g. (21), (22), (23), (24), (25), i 

A A -Bis(tosyl)sulphurdi-imide (33) was shown to be a useful reagent for the dehydrogenation of hydrazo- to azo-compounds as well as for the allylic 

The molecular structure of iVA -dimethylsulphurdi-imide was studied in the gas phase. The preparation, properties, and structures of a selection of di-, tri-, and tetra-co-ordinate cyclic sulphur-nitrogen compounds have been discussed.  

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Benzene-1,2-disulphenyl dichloride is converted into a trithiadiazepine ring by stirring for several days at room temperature with bis(trimethyisilyl)sulphurdi-imide. 

The aminomercaptosulphurdi-imides (13) have been prepared by the reaction of monosilylated sulphurdi-imides (14) with aminosulphenic acid chlorides. On reaction of (14) with dichlorosulphane, the sulphur di-imidosulphanes (15) are formed. ... 

Using the same CNDO/2 calculations as applied to the sulphurdi-imides, Grunwell and Danison have carried out calculations of the geometry of sulphinyl-amines, including 3d orbitals in the basis set. They concluded that the trans conformation about the N= S bond was the more stable. 

Fundamental information on bonding is provided by photoelectron spectroscopy of thioanisoles and other alkyl aryl sulphides. Two conformers are predominant for these compounds, RSPh, and the proportion of the conformer with maximum overlap decreases through the series R = H, Me, Et, Pr or Bu. Related studies for sulphoxides provide correlation diagrams for the effects of substituents R in RS(0)R, as well as information on preferred conformations. An orienting survey of hexavalent sulphur functional groups, viz. alkyl, vinyl, and aryl sulphones, S -dialkyl sulphimides, sulphuryl halides, sulphoximides, and sulphurdi-imides, is available. ... 

Electron Diffraction.— Bond-length and bond-angle data have become available for trifluoromethanethiol, phenyl vinyl sulphide, dimethyl disulphide, ethyl methyl disulphide, dimethyl sulphurdi-imide, and benzenesulphonyl chloride. ... 

Stable thiaziridine dioxide (39), or to a primary amine to give the sulphamide (40). As nitrogen analogues of SO3, stable sulphurtri-imides were synthesized from the sulphurdi-imide (20) with trifluoroacetic anhydride. ... 

The vibrational spectra of sulphurdi- and tri-imides have been determined, and (MesSiN)2SF2 acylated to give linear and cyclic amides. The urea is formed by rearrangement of the substitution product of McsSiNEta and SF5NCO, while Se02 inserts into the Si—N bond of this amine, ... 

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