1,5-Dihydro-1,2,3,4-thia(S IV )triazoles from quaternary salts of NN-disubstituted thioamides and sodium azide
作者:Susan I. Mathew、Frank Stansfield
DOI:10.1039/p19740000540
日期:——
Quaternarysalts [e.g.(I)] of disubstituted thioamides react with aqueous sodium azide at room temperature giving high yields of products which are probably 1,5,5-trisubstituted 1,5-dihydro-1,2,3,4-thia(SIV)triazoles [e.g.(III)]. These are decomposed by dilute acids with loss of nitrogen giving amidines [e.g.(VII)] and thiosulphinic S-esters [e.g.(VIII)]. When the thiatriazole (III) is heated in solution
Reaction of equimolar amounts of the carbenium iodide [Me2N(Ph)CSMe]I and LiAs(SiMe3)(2) . 1.5THF afforded the thermolabile arsaalkene Me3SiAs = C(Ph)NMe2 (1), which in situ was converted into the black crystalline ferrioarsaalkene [(eta (5)-C5Me)(Co)(2)FeAs=C(Ph)NMe2)] (2) by treatment with [(eta (5)-CSMe2)(CO)(2)FeCl]. Compound 2 was protonated by ethereal HBF4 to yield [(eta (5)-CsMe5)(Co)(2)FeAs(H)C(Ph)NMe2] BF4 (3) and methylated by CF3SO3Me to give [(eta (5)-C5Me5)(CO)(2)Fe As(Me)C(Ph)NMe2] - SO3CF3 (4). [(eta (5)-C5Me5)(Co)(2)FeAs[M(CO)(n)]C(Ph)NMe2] (5: [M(CO)(n)] = [Fe(CO)(4)]: 6: [Cr(CO)(5)]) were isolated from the reaction of 2 with [Fe-2(CO)PI or [(Z)-cyclooctene}Cr(CO)(5)], respectively. Compounds 2-6 were characterized by means of elemental analyses and spectroscopy (IR, H-1, C-13H-1}-NMR). The molecular structure of 2 was determined by X-ray diffraction analysis.