Denis Nikalin - Academia.edu (original) (raw)
Papers by Denis Nikalin
![Research paper thumbnail of Synthesis of 4-aryl-2,6,6-trimethyl-5-oxo-5,6-dihydro-4 H -thieno[3,2- b ]pyrroles](https://attachments.academia-assets.com/45083676/thumbnails/1.jpg)
](Russian Chemical Bulletin, 2003
The method for the synthesis of 4 aryl 2,6,6 trimethyl 5 oxo 5,6 dihydro 4Н thie no[3,2 b]pyrrole... more The method for the synthesis of 4 aryl 2,6,6 trimethyl 5 oxo 5,6 dihydro 4Н thie no[3,2 b]pyrroles from accessible 4 aminothiophene derivatives was developed.
![Research paper thumbnail of Synthesis of first spiropyrans and spirooxazines based on thieno[3,2- b ]pyrroles](https://attachments.academia-assets.com/45083701/thumbnails/1.jpg)
](Russian Chemical Bulletin, 2004
-(no yields given). -(KRAYUSHKIN*, M. M.; SHIRINIAN, V. Z.; NIKALIN, D. M.; Russ.
Journal of Photochemistry and Photobiology A-chemistry, 2007
Novel spiropyrans of the thienopyrroline series have been synthesized and their photochromic prop... more Novel spiropyrans of the thienopyrroline series have been synthesized and their photochromic properties studied and compared with those of the indoline analogues. As compared with the indoline analogues, the absorption bands of the cyclic forms of the thienopyrroline spiropyrans are shifted to the blue spectral region, whereas those of the ring-opened forms are shifted to the red region. The merocyanine
Journal of Photochemistry and Photobiology A-chemistry, 2009
Photochromic properties of novel spirooxazines of the thienopyrroline series have been studied in... more Photochromic properties of novel spirooxazines of the thienopyrroline series have been studied in comparison with those of an indoline analogue. Solvatochromism of the merocyanine photoisomers has been investigated using the Kamlet–Taft model. It has been found that inversion of the trends in the solvatochromic behavior of the spirooxazines takes place when passing from non-protogenic to protic solvents. Thienopyrroline spirooxazines possess
![Research paper thumbnail of Synthesis of thieno[3.2- b ]pyrrolenine derivatives under the Fischer reaction conditions](https://attachments.academia-assets.com/45083718/thumbnails/1.jpg)
](Russian Chemical Bulletin, 2005
The reaction of alkyl 4-(2-acetylhydrazino)-2-methyl-3-thiophenecarboxylates with 3-methylbutan-2... more The reaction of alkyl 4-(2-acetylhydrazino)-2-methyl-3-thiophenecarboxylates with 3-methylbutan-2-one was carried out under the Fischer reaction conditions. The influence of Lewis acids and solvents on the process was studied. A convenient method for the synthesis of thieno [3.2-b]pyrrolenine derivatives was proposed.
Russian Chemical Bulletin, 2004
Regioselective C- or O-alkylation of alkyl 4-hydroxy-2-methylthiophene-3-carboxylates with a-halo... more Regioselective C- or O-alkylation of alkyl 4-hydroxy-2-methylthiophene-3-carboxylates with a-halo ketones is possible, depending on the solvent nature. A convenient preparative method of C-alkylation was proposed and previously not easily accessible ß-hydroxythiophene derivatives were synthesized.
Molecular Crystals and Liquid Crystals, 2005
Different types of diarylethenes bearing thiophene derivatives were synthesized by a short way an... more Different types of diarylethenes bearing thiophene derivatives were synthesized by a short way and its photchromic properties were examined. It has been demonstrated for the first time that the photochromism of diarylcyclobutenediones depends on aryl substituents and dithienylcyclobutenediones in contrast to the annulated thiophene derivatives of cyclobutenedione, do not exhibit photochromic properties. An efficient approach for the synthesis of spiro
European Journal of Organic Chemistry, 2006
ABSTRACT
Molecular Crystals and Liquid Crystals, 2005
Two routes to thieno[3,2-b]pyrrolenines are developed and new spiropyranes and spirooxazines base... more Two routes to thieno[3,2-b]pyrrolenines are developed and new spiropyranes and spirooxazines based on thienopyrrole are synthesized. Benzene ring in the chromene part of the spiro molecule is also replaced with thiophene one to give new merocyanines.
Russian Chemical Bulletin, 2003
The method for the synthesis of 4 aryl 2,6,6 trimethyl 5 oxo 5,6 dihydro 4Н thie no[3,2 b]pyrrole... more The method for the synthesis of 4 aryl 2,6,6 trimethyl 5 oxo 5,6 dihydro 4Н thie no[3,2 b]pyrroles from accessible 4 aminothiophene derivatives was developed.
Russian Chemical Bulletin, 2004
-(no yields given). -(KRAYUSHKIN*, M. M.; SHIRINIAN, V. Z.; NIKALIN, D. M.; Russ.
Journal of Photochemistry and Photobiology A-chemistry, 2007
Novel spiropyrans of the thienopyrroline series have been synthesized and their photochromic prop... more Novel spiropyrans of the thienopyrroline series have been synthesized and their photochromic properties studied and compared with those of the indoline analogues. As compared with the indoline analogues, the absorption bands of the cyclic forms of the thienopyrroline spiropyrans are shifted to the blue spectral region, whereas those of the ring-opened forms are shifted to the red region. The merocyanine
Journal of Photochemistry and Photobiology A-chemistry, 2009
Photochromic properties of novel spirooxazines of the thienopyrroline series have been studied in... more Photochromic properties of novel spirooxazines of the thienopyrroline series have been studied in comparison with those of an indoline analogue. Solvatochromism of the merocyanine photoisomers has been investigated using the Kamlet–Taft model. It has been found that inversion of the trends in the solvatochromic behavior of the spirooxazines takes place when passing from non-protogenic to protic solvents. Thienopyrroline spirooxazines possess
Russian Chemical Bulletin, 2005
The reaction of alkyl 4-(2-acetylhydrazino)-2-methyl-3-thiophenecarboxylates with 3-methylbutan-2... more The reaction of alkyl 4-(2-acetylhydrazino)-2-methyl-3-thiophenecarboxylates with 3-methylbutan-2-one was carried out under the Fischer reaction conditions. The influence of Lewis acids and solvents on the process was studied. A convenient method for the synthesis of thieno [3.2-b]pyrrolenine derivatives was proposed.
Russian Chemical Bulletin, 2004
Regioselective C- or O-alkylation of alkyl 4-hydroxy-2-methylthiophene-3-carboxylates with a-halo... more Regioselective C- or O-alkylation of alkyl 4-hydroxy-2-methylthiophene-3-carboxylates with a-halo ketones is possible, depending on the solvent nature. A convenient preparative method of C-alkylation was proposed and previously not easily accessible ß-hydroxythiophene derivatives were synthesized.
Molecular Crystals and Liquid Crystals, 2005
Different types of diarylethenes bearing thiophene derivatives were synthesized by a short way an... more Different types of diarylethenes bearing thiophene derivatives were synthesized by a short way and its photchromic properties were examined. It has been demonstrated for the first time that the photochromism of diarylcyclobutenediones depends on aryl substituents and dithienylcyclobutenediones in contrast to the annulated thiophene derivatives of cyclobutenedione, do not exhibit photochromic properties. An efficient approach for the synthesis of spiro
European Journal of Organic Chemistry, 2006
ABSTRACT
Molecular Crystals and Liquid Crystals, 2005
Two routes to thieno[3,2-b]pyrrolenines are developed and new spiropyranes and spirooxazines base... more Two routes to thieno[3,2-b]pyrrolenines are developed and new spiropyranes and spirooxazines based on thienopyrrole are synthesized. Benzene ring in the chromene part of the spiro molecule is also replaced with thiophene one to give new merocyanines.