Petr Markovich Zorky. Scientific life

Grineva, O. V.

doi:10.1007/s11224-007-9185-7

Cited by 9 publications

(10 citation statements)

References 74 publications

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“…The elongation of the ClÁ Á ÁCl distances in phase and the shortening of ClÁ Á ÁC distances may be caused by the electrostatic contribution to the interactions between these atoms. The absence of short ClÁ Á ÁCl contacts in phases and is consistent in certain aspects with the chlorophobic effect postulated for chlorinated aromatic compounds by Grineva & Zorky (1998, 2000a.…”

Section: Figuresupporting

confidence: 82%

Absence of halogen...halogen interactions in chlorotrimethylsilane polymorphs

Gajda

Dziubek

Katrusiak

2006

Acta Crystallogr Sect B

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The structures of in situ pressure-frozen chlorotrimethylsilane crystals, (CH3)3SiCl, have been determined at 0.23, 0.30 and 0.58 GPa. The molecular arrangements in the low-temperature and high-pressure phases are two-dimensionally isostructural, but different in the third perpendicular direction. Consequently, a striking similarity exists between the unit-cell dimensions of these polymorphs. The absence of short Cl...Cl contacts, both in the low-temperature or pressure-frozen phases of (CH3)3SiCl, has been rationalized in terms of the favoured packing patterns and comparable energies of halogen...halogen interactions and other van der Waals forces.

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Section: Figuresupporting

confidence: 82%

Absence of halogen...halogen interactions in chlorotrimethylsilane polymorphs

Gajda

Dziubek

Katrusiak

2006

Acta Crystallogr Sect B

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“…Consideration of the crystal habit and its rate of growth, and an inspection of the molecular arrangement indicates that the strongest intermolecular interactions are within the layers perpendicular to [001]. These observations can be interpreted as consistent with the existence of the chlorophobic effect postulated by Grineva & Zorky (1998. Therefore, further studies on the structure of compounds with very weakly interacting molecules need to be carried out to resolve the role of halogen-Á Á Áhalogen interactions in the formation of crystals.…”

Section: Discussionmentioning

confidence: 92%

“…They are thought to play an important role in molecular arrangement in crystals (Legon, 1999;Metrangolo & Resnati, 2001). There is also an alternative hypothesis that the occurrence of short ClÁ Á ÁCl distances results from the socalled chlorophobic effect (Grineva & Zorky, 1998, in which the molecules arrange themselves in order to minimize the number of contacts between the Cl atoms and atoms of other types. The suggestion of this effect was based on the observation made for aromatic chloro derivatives that interactions with Cl atoms are the least favourable (least attractive).…”

Section: Introductionmentioning

confidence: 99%

In situ high-pressure crystallization and compression of halogen contacts in dichloromethane

Podsiadło¹,

Dziubek²,

Katrusiak³

2005

Acta Crystallogr Sect B

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The structure of dichloromethane, CH2Cl2, crystallized in situ in a diamond-anvil cell, has been determined by single-crystal X-ray diffraction at 1.33 and 1.63 GPa. The pressure-frozen crystal was determined to be orthorhombic, with the space group Pbcn, and isostructural with the low-temperature phase at 0.1 MPa. The CH2Cl2 molecules are located on one set of crystallographic twofold axes. The characteristics determined for the CH2Cl2 crystal (compression of the close intermolecular contacts, molecular association and the crystal habit of dichloromethane) suggest that the crystal cohesion forces are dominated by H...Cl interactions rather than by Cl...Cl attractions.

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“…Thus, for additional clarity, we considered this crystal structure from the viewpoint of intermolecular interaction energies, as first proposed by Zorkii and co-authors [51][52][53], and successfully used by other authors [54,55].…”

Section: Methodsmentioning

confidence: 99%

Synthesis of 4-Acyl-3-Aminofurazans from 3,4-Diacylfuroxans

Sheremetev

Zabusov

Tukhbatshin

et al. 2014

Chem Heterocycl Comp

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It was shown that 3,4-diaroylfuroxans are transformed into the corresponding 3-amino-4-aroylfurazans by heating in aqueous ammonia. The developed one-pot methodology for the synthesis of 3-amino-4-aroylfurazans involved the interaction of the corresponding acetophenones with nitric acid followed by treatment of the in situ formed furoxans with ammonia at elevated temperature. The structures of the obtained furazans were confirmed by IR, as well as by 1 H and 13 C NMR spectroscopy, and X-ray structural analysis was performed for 3-amino-4-(4-methoxybenzoyl)furazan.Keywords: furazan, furoxan, one-pot synthesis, 1 H and 13 С NMR spectroscopy, X-ray structural analysis. 4-Acyl-3-aminofurazans (4-acyl-3-amino-1,2,5-oxadiazoles) are exceedingly rare and mostly difficult to obtain compounds [1]. At the same time, the synthetic potential of synthons with ortho-lockated amine and acyl groups is quite substantial and opens the possibilities for construction of diverse fused heterocycles [2-6]. On the other hand, involving one of these functionalities in a reaction provides access to polyfunctional compounds [7][8][9][10][11][12][13][14][15][16][17][18][19].A study of 3,4-di(4-methylbenzoyl)furoxan (1а) reaction with aqueous ammonia (Scheme 1) was published in 1887, and the reported product had the empirical formula of C 10 H 9 N 3 O 2 . This compound was tentatively identified as 3-amino-4-(4-methylbenzoyl)furazan (2а) [20,21]; methylbenzoyl amide was formed as by-product. Analogous reactions were soon thereafter performed also with 3,4-di(benzoyl)-(1b) and 3,4-di(4-meth-oxybenzoyl)furoxans (1c) [7,8,[22][23][24]. The proposed structures of the obtained products were supported by elemental analysis data only. The possible structures for the product of this reaction included 1,2,4-oxadiazole and isoxazole rings, namely, compounds 3a-c and 4a-c. Involving these products in various chemical transformations also did not allow to make a clear choice between the alternate structures 2-4 [7,8]. The compound with phenyl substituent was characterized by 13 С NMR spectroscopy in 1978 [25], and there were 7 carbon signals (which was also true for all isomers 2, 3 and 4), but no detailed assignement was made.

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Petr Markovich Zorky. Scientific life

Cited by 9 publications

References 74 publications

Absence of halogen...halogen interactions in chlorotrimethylsilane polymorphs

Absence of halogen...halogen interactions in chlorotrimethylsilane polymorphs

In situ high-pressure crystallization and compression of halogen contacts in dichloromethane

Synthesis of 4-Acyl-3-Aminofurazans from 3,4-Diacylfuroxans

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