A simple route for the synthesis of symmetrical thiourea derivatives and amidinium cations by reaction between isocyanides, amines and carbon disulfide
Reaction between primary amines and CS2 promoted by alkyl isocyanides in ethanol as solvent provides a simple and efficient route for the synthesis of symmetrical thiourea derivatives. The reaction of secondary amines with carbon disulfide and alkyl isocyanides afforded new amidinium cations in good yields.
The invention relates to thiazolidine derivatives having in 4-position a hydroxy group and a 3'-sulphamyl-phenyl substituent, in 2-position an imino group and in 1-position an aliphatic or cycloaliphatic substituent. Said thiazolidines have diuretic activity. The invention also relates to a process for the manufacture of said compounds.
Use of sulfur and selenium compounds as precursors to nanostructured materials
申请人:THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK
公开号:US10253256B2
公开(公告)日:2019-04-09
The presently disclosed subject matter provides processes for preparing nanocrystals, including processes for preparing core-shell nanocrystals. The presently disclosed subject matter also provides sulfur and selenium compounds as precursors to nanostructured materials. The presently disclosed subject matter also provides nanocrystals having a particular particle size distribution.
Rapid and highly efficient synthesis of thioureas in biocompatible basic choline hydroxide
作者:Najmedin Azizi、Elham Farhadi
DOI:10.1080/17415993.2017.1327591
日期:2017.9.3
ABSTRACT A straightforward and convenient synthesis of symmetrical thiourea derivatives by the reaction of primary amines and carbon disulfide in biocompatible basic choline hydroxide is presented. A variety of biologically important thiourea derivatives can be obtained in good to excellent yields without a tedious work-up under mild reaction conditions. A series of primary aliphatic and aromatic amines
Photoinduced and thermal isomerization processes for bis-oxonols: rotor volume, stereochemical and viscosity effects
作者:Andrew C. Benniston、Anthony Harriman
DOI:10.1039/ft9949002627
日期:——
Four bis-oxonols have been synthesized which possess different alkyl substituents appended to the thiobarbiturate subunit. The nature of the alkyl substituent affects the photophysical properties of the dye in solution since it modulates the rate of rotation of the thiobarbiturate subunit around one of the double bonds in the connecting trimethine bridge. Rates of light-induced (trans to cis) and thermal (cis to trans) isomerization processes have been measured for one of the dyes in protic (i.e. alkanols) and aprotic solvents at various temperatures. These rates, together with activation energies derived from Arrhenius plots, are discussed in terms of the hydrogen bonding and stereochemical properties of the solvent. The thermal step is very sensitive to the stereochemistry of the solvent while the light-induced process is controlled mostly by the size of the rotor and the solvent viscosity. The overall effects may be explained, at least in a qualitative sense, in terms of the medium-enhanced barrier model.