Desulfurization of thioureas, benzimidazoline-2-thiones and 1,3-dihydro-1,3-diaryl-2-thioxopyrimidine-4,6(2H,5H)-diones with nickel boride at ambient temperature

Nickel boride is reported to bring about desulfurization and reductive cleavage of N,N'-diarylthioureas to give corresponding anilines and N-methylanilines while N,N'-dialkylthioureas have been observed to undergo desulfurization to give formamidines; benzimidazoline-2-thiones are reported to undergo desulfurization to benzimidazoles and 1,3-dihydro-1,3-diaryl-2-thioxopyrimidine- 4,6( 2H, 5H)-diones have been observed to yield corresponding hexahydropyrimidine- 4,6-diones in high yields in dry methanol at ambient temperature.