Silicon Tetraisothiocyanate and Methylsilicon Isothiocyanates

Silicon tetraisothiocyanate was first prepared by Miquel and Reynolds by treating silicon(IV) chloride with lead thiocyanate. Later, Forbes and Anderson prepared many substituted silicon isothiocyanates by metathetical reaction of the corresponding chlorosilanes with silver thiocyanate. On the bases of molecular refraction studies, the latter workers concluded that the silane derivatives are isothiocyanates rather than the isomeric thiocyanates. Conclusive proof that these compounds are isothiocyanates is their formation in good yield from isocyanosilanes and sulfur  

Although the silicon isothiocyanates have been prepared by treating chlorosilanes with the thiocyanates of sodium, 

I Central Research Department, Experimental Station, E. I. du Pont de Nemours Company, Wilmington, Del. 

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Silicon tetraisothiocyanate and methylsilicon isothiocyanates (includes silver thiocyanate), synthesis 7... 

In chemical reactions and physical properties the methylsilicon isothiocyanates are very similar to silicon tetraisothiocyanate. Methylsilicon triisothiocyanate and dimethylsilicon diisothiocyanate are colorless solids at room temperature, whereas trimethylsilicon isothiocyanate is a colorless liquid. All possess pungent odors and are lacrimators. The melting and boiling points are respectively methylsilicon triisothiocyanate, 72.4°, 266.8° dimethylsilicon diisothiocyanate, 18.0°, 217.3° trimethylsilicon isothiocyanate, — 32.8°, 143.1°. 

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