Thioformyl cyanide

Only a few examples of this useful thermal reaction have been described. The elusive thioformyl cyanide 39 has been generated by elimination of propene from 38 upon FVP at... 

Csaszar41 for thioformyl cyanide, when comparing MP2/6-31G(d,p) and MP2/6-31 lG(d,p) optimized structures (see Table 3). 

Thioformyl cyanide was generated under FVT conditions by retro-ene cleavage of allyl cyanomethyl sulfide as shown in equation 99. Spectroscopic properties of this compound are discussed in Section II. Note that thioformyl cyanide had already been prepared by retro-Diels-Alder reaction (see Section III F 4)... 

Thioformyl and thiocarbonyl cyanides. The long-sought for IR spectrum of this compound was obtained by Wentrup and coworkers162. S=CH—CN was prepared by Flash Vacuum Pyrolysis (FVP) of allyl cyanomethyl sulfide and condensed in an argon matrix. The absorption frequencies(in cm-1) and the intensities (in km mol-1) corresponding to the five bands observed were V2, CN stretch (2221, 17) vj, CH rock (1320, 11) U4, CS stretch (1103, 10) 05, CC stretch (889, 8) vg, CH wag (824, 26). These assignments were made on the basis of MP2/6-31G(d) calculations. The spectrum of formyl cyanide is reported and discussed elsewhere163. 

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