Methyl γ-phenylacetoacetate in the synthesis of derivatives of α-aminoindol-2-yl-acetic acid

The cyclization of the di(phenylhydrazone) of methyl -phenyl-,-dioxobutyrate with hydrazines has given phenylhydrazones of methyl indol-2-ylglyoxylates, which have been reduced to methyl -aminoindol-2-ylacetates. Some reactions of these compounds have been studied.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1040–1042, August, 1973.     

Nanoscale deformation irregularities of γ-irradiated poly(methyl methacrylate)

Development of deformation jumps in the creep of poly(methyl methacrylate) (PMMA) has been studied. The structural levels of deformation have been determined from the creep rate oscillation periods (deformation jumps) measured by the interferometric method. Special attention is given to a new method of data processing, which enables one to reveal previously undetectable nanoscale deformation jumps. By the example of PMMA specimens preliminarily exposed to γ radiation with doses D=55–330 kGy and unexposed specimens, the presence of nanoscale deformation jumps with the values dependent on the dose D and time of creep has been shown. The obtained results confirm the existence of 10–20-nm domains in amorphous polymers and make it possible to study the multilevel organization of the deformation process, starting from the nanoscale.     

On surface integrals related to distributions of random matrices

We construct the first quadratic form and the volume element of the surface consisting of all positive semidefinite m × m matrices of rank r with r distinct positive eigenvalues. We give the density function of the singular gamma distribution.     

Functional thiophene derivatives

The thiocyanation of 5-acylaminothiophenes gives 4-thiocyanato derivatives, the intramolecular cyclization of which gives 2-acylaminothieno[2,3-d]thiazoles.See [1] for communication VIII.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1204–1205, September, 1974.     

Addition formulas for reducedL p -cohomologies

The research was supported by the Russian Foundation for Fundamental Research (grant 93-011-180).