Results 31 to 40 of about 4,154 (224)
THE TAUTOMERISM OF PYRAZOLINES (DIHYDROPYRAZOLES) [PDF]
Journal of the Chilean Chemical Society, 2015 The exception to the rule that Δ3-pyrazolines are not stable unless both nitrogen atoms are substituted that has been recently published, Tetrahedron Lett. 55, 2208, (2014), has been proved false. By means of GIAO/B3LYP/6-311++G(d,p) calculations, it has been shown that the product is a pyrazole formed by rearrangement.
ALKORTA, I, ELGUERO, J
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Synthesis and Pharmacological Evaluation of Some Phenylpyrazolo Indoquinoxaline Derivatives
E-Journal of Chemistry, 2011 Indoloquinoxalin was fused with 2,3 diphenyl quinoxaline by a methylene bridge which was then allowed for acetylation. The acetylated product was made to react with different aromatic aldehydes to give chalcones.
CH. Sridevi, K. Balaji, A. Naidu
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Synthesis and structure elucidation of novel pyrazolyl-2-pyrazolines obtained by the reaction of 3-(3-aryl-3-oxopropenyl)chromen-4-ones with phenylhydrazine [PDF]
, 2012 Novel 3-aryl-5-{4-[5-(2-hydroxyphenyl)-1-phenylpyrazolyl]}-2-pyrazolines 2a-g have been prepared by the treatment of 3-(3-aryl-3-oxopropenyl)chromen-4-ones 1a-g with phenylhydrazine in refluxing acetic acid. NMR studies on deuteriochloroform solutions of
Jeko, József +3 more
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Acta Crystallographica Section E: Crystallographic Communications, 2019 In the title pyrazoline derivative, C16H16N2O3·H2O, the pyrazoline ring has an envelope conformation with the substituted sp2 C atom on the flap. The pyrazoline ring makes angles of 86.73 (12) and 13.44 (12)° with the trisubstituted and disubstituted ...
Linh Duong Khanh +5 more
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Crystal structure of 5-(4-methoxyphenyl)- 3-(4-methylphenyl)-4,5-dihydro-1Hpyrazole- 1-carbaldehyde [PDF]
, 2015 In the title compound, C18H18N2O2, the pyrazole ring has a twisted conformation on the CH—CH2 bond. The tolyl ring and the 4-methoxyphenyl ring are inclined to the mean plane of the pyrazole ring by 4.40 (9) and 86.22 (9) , respectively, while the ...
Adam, Farook +4 more
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X-ray analysis of different starch granules [PDF]
, 1995 Crystal sizes and lattice distortion parameters for root, pulse and cereal starch granules have been determined using observed X-ray diffraction reflections by Fourier method.
Ali, S. Z. +4 more
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Radical Fluoroalkylation Reactions [PDF]
, 2018 Recent protocols and reactions for catalytic radical perfluoroalkylations will be described. The production of perfluoroalkyl radicals (RF = CnF2n+1, n ≥ 2), which effect both addition and substitution reactions on organic substrates, can be realized ...
Barata Vallejo, Sebastian +2 more
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Bulletin of the Chemical Society of Ethiopia, 2014 Some aryl-aryl 1H pyrazoles have been synthesised by cyclization of aryl chalcones and hydrazine hydrate in the presence of SOCl2. The yields of the pyrazoles are more than 85%.
K. Ranganathan +5 more
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Synthesis of Some substituted (Pyrazolines) Derived From Benzotriazole [PDF]
Kirkuk Journal of Science, 2016 In this paper , a number of heterocyclic compounds with five-memberd pyrazolines were prepared , the ester compound (1) was synthesized from the reaction of benzotriazole with ethyl chloroacetate , the hydrazide (2) was prepared from the reaction of ...
Fariq Salah Ahmed +2 more
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Pyrazoline as a medicinal scaffold [PDF]
Bionatura, 2019 Heterocyclic Chemistry is the backbone of medicinal compounds that exhibits numerous biological activities. Pyrazole and its derivatives possess nitrogen atom along with carbon atom as a substitution and show a diversity of biological activities such as antibacterial, antimicrobial, anti-inflammatory, antioxidant, antidiabetic, anticancer, antifungal ...
Gurinderdeep Singh +3 more
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