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Strakova, I. A.; Strakov, A. Ya.; Петрова, М. В.

doi:10.1023/a:1017550931401

Cited by 7 publications

(8 citation statements)

References 4 publications

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“…The presence in the IR spectra of solutions (0.01 mol l -1 ) of products obtained from pyruvates Ia and Ib in reaction with phenylhydrazine of an absorption band belonging to chelated lactam C=O (1680 and 1675 cm 1 ) and NH groups (32003240 cm 1 ) evidences according to published data [16] the formation of an intramolecular hydrogen bond that is probable in the isomers of hydrazone type VIIIa and VIIIb and impossible in the aza form IX although the light-orange and bright-red colors of the final products suggest the aza structure of compounds. The unambiguous choice between the structures VIII and IX in favor of VIII was based on the X-ray diffraction study.…”

Section: Reactions Of Isomeric Arylchloropyruvates and Glycidates Witsupporting

confidence: 57%

Reactions of Isomeric Arylchloropyruvates and Glycidates with Hydrazines

et al. 2005

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Reactions of arylchloropyruvic acids esters with aryl-and hetarylhydrazines give rise to pyrazolinedione hydrazones as a result of a tandem condensation of the substituted hydrazines with arylchloropyruvates. In contrast to this process in reaction with hydrazine hydrate a ready reduction unexpectedly occurs by Kizhner Wolff mechanism affording 3-hydroxydihydrocinnamic acid hydrazide as the principal product. The isomeric arylglycidate reacts along the same pattern.

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Section: Reactions Of Isomeric Arylchloropyruvates and Glycidates Witsupporting

confidence: 57%

Reactions of Isomeric Arylchloropyruvates and Glycidates with Hydrazines

et al. 2005

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“…The crystal structure consists of the heterocyclic molecules, solvated by DMF molecules. The pyrazolocoumarin moiety is essentially planar (r.m.s deviation of the tricyclic ring atoms = 0.018 Å) as is in the similar structures (Strakova et al, 2003;Kanwal et al, 2007). The plane of the tricyclic ring is inclined slightly with respect to the N-phenyl ring, making an angle of 1.86 (9)°.…”

Section: Data Collectionmentioning

confidence: 76%

“…For related structures, see: Strakova et al (2003); Kanwal et al (2007). For a crystal structure (p-iodobenzaldehyde) having IÁ Á ÁO interactions, see: Britton & Young (1997).…”

Section: Related Literaturementioning

confidence: 99%

8-Chloro-6-iodo-2-phenylchromeno[4,3-c]pyrazol-4(2H)-oneN,N-dimethylformamide monosolvate

et al. 2011

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In the title compound, C16H8ClIN2O2·C3H7NO, the fused tricyclic pyrazolocoumarin ring and the N-phenyl ring are almost coplanar, the dihedral angle between them being 1.86 (9)°. In the crystal, these rings stack on top of each other via π–π interactions [centroid–centroid distances = 3.489 (2), 3.637 (2), 3.505 (2) and 3.662 (2) Å], forming infinite chains along the a axis. The chains are connected into layers parallel to ac plane through I⋯O interactions [3.0011 (18) Å] between pairs of symmetry-related molecules. The DMF solvent molecules are C—H⋯O bonded to this network.

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“…

Keywords: α-diazo ketones, 2,3-diaryl-6, 5,6,5,6,7-tetrahydroindazoles have been prepared by oxidation of the corresponding 6,6-dimethyl-4-oxo-4,5,6,7-tetrahydroindazoles using H 2 SeO 3 [1] and have found a variety of uses in the modification of indazoles and pyrazoles [2][3][4][5][6][7]. On this basis pyrazole mono-and dicarboxylic acids have been prepared by subsequent oxidation of the α-diketone with hydrogen peroxide [1, 4, 5], a benzyl rearrangement [8], or cleavage of a tosylate monoxime [9].

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mentioning

confidence: 99%

“…Oxidation of the 2,3-diaryl-6,6-dimethyl-4-oxo-4,5,6,7-tetrahydroindazoles 1a-g [12,13] was carried out using the method reported in [5][6][7]. The α-dicarbonyl structural fragment in the 4,5-dioxo derivatives 2a-g produced gave two characteristic IR spectroscopic frequencies at 1735-1725 (ν C (5) =O) and 1690-1670 cm -1 (ν C (4) =O).…”

mentioning

confidence: 99%