Novel Reactions of Tropylium Salts with Heterocyclic Diamines

Russian Journal of General Chemistry - The reactions of tropylium salts with 2,5-diamino-1,3,4-thiadiazol, 3,5-diamino-1,2,4-thiadiazol, and 2,6-diaminopyridine have given novel products of...     

Interaction between meso-Phenyl-Substituted Porphirinioids and Carboxylic Acids,and a Thermal Analysis of Their Cationic Salts

Russian Journal of Physical Chemistry A - Thermogravimetry and quantum chemistry, including NBO analysis, are used to study the thermal stability and NH acidity of single and double protonated...     

Synthon-Based Approach to the Design of Macroheterocyclic Compounds Using Diaminothiadiazoles and Diamonotriazoles

Russian Journal of General Chemistry - Synthesis and properties of 2,5-diamino-1,3,4-thiadiazole, 3,5-diamino-1,2,4-thiadiazole, 3,5-diamino-1H-1,2,4-triazole,...     

Synthesis of 2<Emphasis Type="Italic">N</Emphasis>-Alkyl-substituted 5-Amino-3-imino-1,2,4-thiadiazolines

Conditions for an efficient and a readily reproducible synthesis of a series of 2N-Alkyl-substituted 5-amino-3-imino-1,2,4-thiadiazolines by the direct alkylation of 3,5-diamino-1,2,4-thiadiazole with alkyl bromides in fairly high yields (up to 76%).     

Mesomorphic and Dielectric Properties of Supramolecular 3,5-Diamino-1-dodecyl-1,2,4-triazole

The formation of a thermotropic smectic phase in 3,5-diamino-1-dodecyl-1,2,4-triazole was revealed by polarizing microscopy and DSC. Depending on heating and cooling conditions, transitions between different types of layered packings occur, which was evidenced by dielectric measurements. Quantum-chemical simulation established that the mesomorphism of 1,2,4-triazole derivatives is associated with the formation of supramolecules with a higher polarizability anisotropy. The calculation results confirmed the possibility of lateral hydrogen bonding which favors layered smectic packing.

     

Synthesis of acyclic three-unit products with 3-alkyl-1,3,4-thiadiazoline fragments

A method of synthesis of acyclic trimeric products based on 3-alkyl-5-amino-2-imino-1,3,4-thiadiazoline in the presence of calcium chloride as catalyst has been suggested.     

Microwave-assisted synthesis of macroheterocyclic compounds using 1-alkyl-1,2,4-triazoles

Russian Chemical Bulletin - Microwave-assisted synthesis of new representatives of triazole-containing macroheterocycles bearing 1-alkyl-1,2,4-triazole moieties was described. The developed...     

Study of luminescence properties of cyclic and acyclic thiadiazole-containing compounds

Luminescence properties of thiadiazole-containing compounds of cyclic and acyclic structure have been investigated. All compounds are characterized by fluorescence in the region 500–600 nm. The highest quantum yield of luminescence in the studied series is exhibited by acyclic product of the ABA type (where A is thiadiazole cycle, B is isoindole cycle) with N-pentylthiadiazoline fragments.     

Synthesis of АВВВ-type macroheterocyclic compounds containing a 3-alkyl-1,3,4-thidiazoline fragment

1,1-Dimethoxy-3-inoisoindoline was reacted with 3-alkyl-1,3,4-thiadiazoline to obtain macroheterocyclic compounds containing three isoindole fragments and one 3-alkyl-1,3,4-thiadiazoline fragment. The structure and composition of the synthesized compounds were studied by means of electronic absorption, IR, and ¹H NMR spectroscopy, and well as mass spectral ana elemental analyses.