Sulfides and related compounds

Realgar a-As4S4 (O34) (also P-AkSjiSi), Sc below for allemalive viewpoint 

With AS4S4 there are two possible geometrieal isomers of the moleeule depending on whether the 2 As-As bonds are skew or adjaeent, as shown in Fig. 13.17. Realgar (mp307°) adopts the more symmetrie D2d form with skew As-As 

Becke-Goehrinc and K. Sommer Z anorg allg. Chem. 371, 193-200 (1969). 

The Structure of AS2S5 is unknown. It is said to be formed as a yellow solid by passing a rapid stream of H2S gas into an ice-cold solution of an arsenate in cone HCl slower passage of H2S at room temperature results in reduction of arsenate to arsenite and consequent precipitation of AS2S3. It decomposes in air above 95° to give AS2S3 and sulfur. 

Reactions of the various sulfides of arsenic call for little further comment. AS2S3 bums when heated in air to give AS2O3 and SO2. Chlorine converts it to ASCI3 and S2CI2. It is insoluble in water but dissolves readily in aqueous alkali or alkali-metal sulfide solutions to give thioarsenites  

Reacidification reprecipitates AS2S3 quantitatively. With alkali metal or ammonium polysulfides thioarsenates are formed which are virtually insoluble even in hot cone HCl  

Sheldrick and H.-J. Hausler, Z anorg. allg. Chem. 561, 139-48 (1988). See also pp. 149-56 for the similarly prepared 05386559 and Cs3Sb5Se9. 

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Thiophene oligomers, preparation of 88H(27)1731. Thiophenecarboxylic acids and their derivatives 86HC(44,3)565. Thiophenethiols, thienyl sulfides, and related compounds 86HC-(44,3)135. 

Thioorthoesters as well as a,a-dihalo sulfides and related compounds may be partially hydrolyzed to yield thiol carboxylic esters. This reaction has been utilized in a sarcomycin synthesis (equation 28). Ketene 5,5-acetals are also hydrolyzed with aqueous acid via dithioorthoesters as has n shown recently, and thiol carboxylic esters are obtained in good yields (equation 29). ... 

H, bis(2-chloroethyl) sulfide and related compounds (Hazardous Waste Code N003)." ... 

Sulfides and related compounds may be degraded by a number of quite different pathways which may be illustrated by the following examples. 

For a fuller discussion of cadmium sulfide and related compounds, see cadmium sulfides and selenides group. 

While much of the chemistry described previously was focused on the synthesis of sulfides and related compounds, a range of diaryl sulfones can also be generated through... 

Troubleshooting the Synthesis of Vinyl Sulfides and Related Compounds... 

While it is impossible to predict every challenge that will arise during the synthesis of sulfur-carbon(sp ) bonds for the synthesis of vinyl sulfides and related compounds, the following suggestions will provide some direction when designing a synthesis. 

Wada, M. and Okawara, R., "Organic tin sulfides and related compounds, Kagaku No Ryoiki 20, 19-2 4- (I966). 

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