S-Substituted Thiocarbamides

1) The reaction of thiocarbamide and haloalkanes S-substituted thiocarbamides can be produced by the following reaction  

The detailed synthetic steps can be found from related documents [10-12]. 

S-substituted thiocarbamides can be prepared from thiocarbamide and esters. These esters include alkyl sulfates, nitrates, and thiocyanates. The synthesis reaction can be given as follows  

Alkyl isothiourea is easily broken down into mercaptan and cyanamide. Therefore, the reverse reaction of decomposition reaction can be used to produce alkyl isothiourea. The reverse reaction of decomposition reaction is as follows  

Comparison of octyl isothiourea and dixanthogen in the flotation of copper-sulfide ore is listed in Table 1.8. The particle size of copper-sulfide ore is 10 mesh. And the mass fraction of copper in copper-sulfide ore is 4-4.5 %. It can be seen that the flotation performance of octyl isothiourea is better than that of dixanthogen. 

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The alkyl derivatives of thiocarbamide can be divided into N-substituted thiocarbamide and S-substituted thiocarbamide. The expressions of N-substituted thiocarbamide and S-substituted thiocarbamide are given as follows ... 

The properties of N-substituted thiocarbamide and S-substituted thiocarbamide will be further expounded by the following sections. 

Table 1.7 Flotation results of pyrite-containing gold using various S-substituted thiocarbamides...

Thiocarbamide can be considered as the product that the O atom of urea is substituted by S atom. 

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