Structure of indoline spiropyrans containing a fused coumarin fragment: Quantum-chemical investigation

In order to examine the way of fusion of the coumarin fragment to the 2H-pyran part of indoline spiropyrans the relative stability was estimated of the cyclic and merocyanine forms by means of calculations in the framework of DFT in B3LYP/6-31G(d,p) approximation. In agreement with the experimental data the relative stabilization of the spirocyclic isomer correlates with the length of the bond where the fusion occurs.     

Photochromic characteristics of spirocyclic organic and coordination compounds

Methods for the structural modification of photochromic spirocyclic systems (derivatives of spirobenzopyrans, spiro-1,3-oxazines, spiropyrimidines, and the bischelate complexes of nontransition metals), optimizing their spectral, kinetic, photochemical, and other characteristics in the direction required for their application as quick-acting chemical memory elements and in optical computers, are examined.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 31, No. 3, pp. 166–180, May–June, 1995.     

Synthesis and structure of azomethines of 1-methyl-2-keto-3-formylindoline

Azomethines of 1-methyl-2-keto-3-formylindoline, to which a ketoamine structure was assigned on the basis of their UV, IR, and PMR spectra, were synthesized. The stability of tautomers of this type is explained by means of quantum-chemical calculations.Communication XXII from the series Benzoid-Quinoid Tautomerism of Azomethines and Their Structural Analogs. See [1] for communication XXI.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 499–503, April, 1975.     

9-R-10-Telluroniaanthracene perchlorates

10-Telluroniaanthracene perchlorates with various substituents in the 9 position were obtained by the action of 70% HClO₄, on 9-R-10-tellura-9-anthracenols and of trityl perchlorate on 9-R-10-tellura-9-anthracenols and 9-R-9H-10-telluraanthracenes. The IR, UV, and PMR spectral characteristics of the products' were investigated.Deceased.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 343–346, March, 1981.     

Benzo-1,3-ditelluroles

Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1144–1145, August, 1988.