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A method for the synthesis of 1 methyl 3,5 dinitropyrazole 4 carbonitrile from 1,4 di methyl 3,5 dinitropyrazole was developed. Nucleophilic substitution in 1,4 dimethyl 3,5 dinitropyrazole, 1 methyl 3,5 dinitropyrazole 4 carboxamide, and 1 methyl 3,5 dinitro pyrazole 4 carbonitrile involves solely the 5 NO 2 group in the ring. 1 Methyl 3,5 dinitro pyrazole 4 carbonitrile reacts with thioglycolic acid phenylamide and potassium carbonate to give 4 amino 1 methyl 3 nitro N phenyl 1H thieno[2,3 c]pyrazole 5 carboxamide. The use of glycolic acid phenylamide instead of thioglycolic acid N phenylamide under analogous conditions resulted in 5 anilino 1 methyl 3 nitro 1H pyrazole 4 carbonitrile. An explana tion for the regiospecificity of the nucleophilic substitution of the 5 NO 2 group in 4 R 1 methyl 3,5 dinitropyrazoles is given.

The diffuse X-ray determination of the energy of mixing in Ge-Si solid solutions carried out in (1) has revealed a tendency to segregation in this system. A s the nature of the effect i s not clear, it i s interesting to predict it theoretically. In the

The short-range order and elastic properties of Ge-Xi solid solutions of 28, 54, and 64% Si are studied by means of X-ray diffuse scattering measurements. The mixing energy of the system taking into account the existence of two f.c.c. sublattices in the diamond structure is determined by extrapolating the long-wave Fourier transforms of the concentration fluctuations Cq to q = 0 points corresponding to the node (400) Die elastischen Konstanten der Ge-Si-Legierung werden bestimmt und ihre positiven Abweichungen aus den zusiitzlichen Werten erhalten, die in guter Ubereinstimmung mit den Werten des Gitterparameters des Systems sind.