Isocyanates, Thiocyanates, Isothiocyanates, Selenocyanates, and Isoselenocyanates

Isocyanates have been obtained by treatment of nitrile oxides with trifluoroacetic acid and also, in high yield, by reactions of 

Aromatic acyl isocyanates have been isolated from thermolyses of 

Methylthiomethyl-, phenylthiomethyl- and bis(phenyIthio)methyl-isocyanates were prepared from the corresponding thioacetic acid 

Isothiocyanates have been obtained directly from primary amines 

Mercury(II) thiocyanate has been found to catalyze addition of thiocyanic acid to alkynes, the structure of which apparently determines the nature of the products. Vinyl isothiocyanates were obtained from symmetrically disubstituted alkynes whereas vinyl 

---