α-Arylazoalkyl Isocyanates and Isothiocyanates by Potassium Permanganate Oxidation of 2,5,5-Trisubstituted 1,2,4-Triazolidin-3-ones and 1,2,4-Triazolidin-3-thiones
α-Arylazoalkyl Isocyanates and Isothiocyanates by Potassium Permanganate Oxidation of 2,5,5-Trisubstituted 1,2,4-Triazolidin-3-ones and 1,2,4-Triazolidin-3-thiones