Transmission of influence of substituent in 2-arylpyrrole-5-carboxylic acids

Research on the influence of substituenis on the reaction centers of molecules, through various bridge groups, is still an urgent task in theoretical organic chemistry. This problem is usually solved using the Hammett equation f= + a, by comparing the coefficient of the particular series of compounds under investigation with the coefficient ₀ of a reference series of compounds. The ratio of coefficients / ₀=, which is called the transmission factor, characterizes structural changes of the bridge group [1, 2].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, 1182–1186, September, 1992.     

Characteristics of the Nucleation Process in a Model Solution of Synovial Fluid in the Presence of Organic Impurities

Crystallography Reports - The regularities of nucleation in a model solution of human synovia under conditions close to physiological have been investigated. The constant of the induction process...     

Spectral Analysis of the Microelemental Composition of Renal Calculi

Using the quantitative technique of spectral analysis, we have determined the elements entering into the composition of renal calculi. The characteristic features of the distribution of Fe, Mg, Pb, Si, Mn, Ca, Ti, Zn, Al, and Cu in renal calculi of oxalate, phosphate, urate, and mixed types are studied.     

UV spectra of N-vinylpyrroles

Chemistry of Heterocyclic Compounds - The effect of the structure and the medium on the position and intensity of the absorption bands in the UV spectra that attest to the presence of a single...