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Encyclopedia Britannica - Main :: MOS-NAN |
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MUSTARD OILS , organic chemical compounds of general formula
primary
2RNHZCS2CS/NHR HgC121RHNCS2J2Hg--HgS+H2S+2RNCS; > \SNH,R .-4 or the isocyanic esters may be heated with phosphorus pentasulphide (A. Michael and G. Palmer, Amer. Chem. Jour., 1884, 6, 257). They are colourless liquids with a very pungent irritating odour. They are readily oxidized, with production of the corresponding amine. Nascent hydrogen converts them into the amine, with simultaneous formation of thio-formaldehyde, RNCS+4H=RNH2+HCSH. When heated with acids to 100 C, they decompose with formation of the amine and liberation of carbon bisulphide and sulphuretted hydrogen. They combine directly with alcohols
Methyl mustard oil, CH3NCS, melts at 35 C.and boils at 119 C. Allyl mustard oil, C3HBNCS, is the principal
ordinary mustard oil obtained on distilling black mustard seeds. These seeds contain potassium myronate (C1oH,8NS20,0K) which in presence of water is hydrolysed by the myrosiri present in the seed,C15I-118NS2O10K = C6Hi206+KHSO4+CaHBNCS. It may also be prepared by heating
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