Novel calix[4]resorcinols with sulfamide fragments in the lower rim

Russian Journal of General Chemistry - Novel calix[4]resorcinols modified by sulfamide fragments were synthesized via acid-catalyzed opening of the pyrrolidine ring in...     

Reaction of 9-[2-(1,3-dioxolan-2-yl)ethyl]-9<Emphasis Type="Italic">H</Emphasis>-purin-6-amine with phenols. Synthesis of diarylpropanes

New 1,1-diarylpropanes containing an adenine fragment on C³ have been synthesized by reaction of 9-[2-(1,3-dioxolan-2-yl)ethyl]-9H-purin-6-amine with phenols in aqueous HCl.     

Water Redistribution in Irrigated Soil Profiles: Invariant Solutions of the Governing Equation

Exact solutions for a class of nonlinear partial differential equations modelling soil water infiltration and redistribution in irrigation systems are studied. These solutions are invariant under two-parameter symmetry groups obtained by the group classification of the governing equation. A general procedure for constructing invariant solutions is presented in a way convenient for investigating numerous new exact solutions.     

Synthesis of Macroheterocycles by Reaction of N,N′-(1,4-Phenylene)bis[N′-(4,4-diethoxybutyl)urea] with Resorcinol and Its Derivatives

An efficient procedure has been developed for the synthesis of macroheterocycles by acid-catalyzed reaction of N,N′-(1,4-phenylene)bis[N′-(4,4-diethoxybutyl)urea] with resorcinol, 2-methylresorcinol, and pyrogallol. The structure of the isolated compounds was proved by spectral methods.

     

Design of composite films and ultrathin membranes of interpolymer complexes

The formation of stoichiometric interpolymer complexes (IPCs) between the poly(vinyl ether) of ethyleneglycol and the copolymer of acrylic acid–butyl vinyl ether, between copolymers of vinyl ether of ethyleneglycol–butyl vinyl ether, and the copolymer of acrylic acid–vinylbutyl ether is demonstrated by conductimetric, potentiometric, viscometric and spectroturbidimetric methods in aqueous solution. The swelling/deswelling behavior of composite films derived from the IPC has been studied in water, alcohol and water–alcohol mixtures, depending on various factors. The formation of polyelectrolyte complexes (PECs) between the copolymer of acrylic acid–vinyl butyl ether and poly(vinyl ether of monoethanolamine) on a dimeric interface of water–butanol has been studied by the potentiometric method. The kinetics of PEC formation on a dimeric interface was measured and the activation energy of this process was calculated. Copyright © 2000 John Wiley & Sons, Ltd.     

Synthesis of 2-(Diphenylphosphoryl)pyrrolidine-1-carboxamides Based on the Reaction of 1-(4,4-Diethoxybutyl)ureas with Diphenyl Chlorophosphine

Russian Journal of General Chemistry - The reactions of 1-(4,4-diethoxybutyl)ureas with diphenyl chlorophosphine in the presence of acetic acid afforded new...     

Reaction of N-(4,4-Diethoxybutyl)phosphamides with Chloro(diphenyl)phosphine. Synthesis of 2-(Diphenylphosphoryl)pyrrolidines

Russian Journal of Organic Chemistry - The reaction of N-(4,4-diethoxybutyl)phosphamides with chloro(diphenyl)phosphine in chloroform in the presence of acetic acid gave previously unknown...     

New methods to synthesize phthalaldehyde and its diacetals

Russian Chemical Bulletin - A new synthesis of phthalaldehyde that avoided formation of HBr involved treatment of 1,2-bis(dibromomethyl)benzene with trimethyl orthoformate (1: 6, 90 °C, 10...