The blocking of the hydroxyl group of the basic benzoate of stannous at the improving of the selectivity of the intermediate product at the interaction of tin oxide (II) with benzoic acid
The heterogeneous heterogeneous variant of the interaction of tin oxide (II) with benzoic acid in the white spirit at the beaded mill by using the solid pieces of fechral as fraying agent allowed to receive the basic benzoate or neutral salt of stannous the almost complete expenditure of the oxide. Quantitative and selective transformation of the basic benzoate as initial stanniferous reagent to the neutral salt in the same conditions and in the same beaded mill is realized. The differences between the processes are in the nature of tribochemical catalyst. To obtain a basic benzoate it is necessary to use such catalysts as the urea, thiourea and a number of other amides of the acids. The catalysts for preparing of neutral salt are the primary amines, for example, p-aminoazobenzene, benzidine, etc. Many of these amines are the catalysts of the interaction of the primary benzoate of stannous (II) with benzoic acid as a completely separate process. In the chosen conditions these processes in wide intervals of the degrees of conversion of tin oxide are simulated the kinetics of irreversible reactions of the first order. Out of these conditions, the kinetics of the process more difficult and there are the basic salt and the neutral salt in the products. This suggests that in the presence of a number of amides of the acid the basic salt loses its ability to interact with the acid and turn into neutral salt. This can be achieved by blocking its reaction center, i.e. the hydroxy! group with the amide by adsorption. This locking is possible only in the contact with the reaction mixture containing the amide. Replacement of the liquid phase per phase without amid returns the basic salt her reactivity.