نتایج جستجو برای: heterocyclic compound

تعداد نتایج: 136217  

2008
Anton V. Dolzhenko Geok Kheng Tan Lip Lin Koh Su Fen Woo Wai Keung Chui

7-Dimethyl-amino-2-phenyl-1,2,4-triazolo[1,5-a][1,3,5]triazin-5-amine crystallized with one mol-ecule of methanol to give the title compound, C(12)H(13)N(7)·CH(3)OH. The triazolo[1,5-a][1,3,5]triazine heterocyclic core is essentially planar as are both amino groups that are involved in π-electron delocalization with the triazolo[1,5-a][1,3,5]triazine nucleus. The methyl groups of the dimethyl-a...

Journal: :Bioscience, biotechnology, and biochemistry 2004
Shin-ichi Hirano Fumiya Kitauchi Mitsuru Haruki Tadayuki Imanaka Masaaki Morikawa Shigenori Kanaya

Two bacterial strains, 127W and T102, were isolated from anoxic crude oil tank sludge as effective degraders of dibenzothiophene (DBT), a model sulfur containing heterocyclic aromatic compound in crude oil. Strain 127W was more tolerant to oxygen limitation than T102 and was capable of degrading two- and three-ring polycyclic and heterocyclic aromatic compounds under both aerobic and low oxygen...

2012
Faryal Chaudhry M. Nawaz Tahir Misbahul Ain Khan Abdul Qayyum Ather Nadia Asif

In the title compound, C(20)H(17)N(3)O(4), the dihedral angles between the heterocyclic ring and the toluene and nitro-benzene rings are 4.21 (15) and 11.43 (14)°, respectively. The whole mol-ecule is close to planar (r.m.s. deviation for the 27 non-H atoms = 0.171 Å). Two S(6) rings are formed due to intra-molecular C-H⋯O and O-H⋯O hydrogen bonds. In the crystal, inversion dimers linked by pai...

Journal: :Organic & biomolecular chemistry 2009
Shoko Yamazaki Yuko Iwata Yugo Fukushima

Ethenetricarboxylic acid diester 1a is a useful compound bearing two reactive sites, a CO2H group and a Michael acceptor. Reactions of 1a and reagents with oxygen and nitrogen nucleophilic moieties have been examined. The reaction of 1a with 2-aminoalcohols in the presence of EDCI and HOBt in one pot gave N,O-containing heterocyclic compounds, regioselectively. The stepwise method has also been...

2005
Lígia M. Rodrigues X. H. Luan

Coumarins are a family of compounds that have been studied extensively for their practical applications, as textile dyes, optical brighteners, laser dyes, sensitisers in phototherapy, biological labels. Coumarin derivatives have been also used in making fluorogenic enzyme substrates. Disperse dyes containing an electron-donating group, such as N,N-diethylamino, and an heterocyclic residue in po...

2008
Hai-Tang Du Hai-Jun Du Weiyi Zhou

In the mol-ecule of the title compound, C(21)H(22)N(4)O(6)S, the planar central heterocyclic ring system is oriented with respect to the trimethoxy-phenyl rings at dihedral angles of 2.60 (5) and 3.60 (6)°. Intra-molecular C-H⋯N and C-H⋯S hydrogen bonds result in the formation of planar five- and six-membered rings. In the crystal structure, inter-molecular C-H⋯O hydrogen bonds link the mol-ecu...

2008
M. Nawaz Tahir Zahid H. Chohan Hazoor A. Shad Islam Ullah Khan

The title compound, C(18)H(16)BrN(3)O(4)S, is a Schiff base ligand of 5-bromo-salicylaldehyde and sulfisoxazole [or N-(3,4-dimethyl-5-isoxazol)sulfanilamide]. The present structure is a zwitterion and is a more precise reinterpretation of the structure which was originally reported by Hämäläinen, Lehtinen & Turpeinen [Arch. Pharm. (1986), 319, 415-420]. The two aromatic rings which make π-π int...

2015
Waseem Gul Ahmed Galal Mahmoud A. ElSohly Paulo Carvalho

In the structure of the title compound, C30H40O6S, the cyclo-hexene and heterocyclic rings are linked by a double bond. The cyclo-hexene ring has a half-chair conformation (the methyl-ene group adjacent to the hy-droxy substituent lies above the remaining atoms) and the hy-droxy and eth-oxy groups have equatorial and bis-ectional dispositions, respectively. The heterocyclic ring has an envelope...

2010
Kun Huang Ping Zhang Da-Bin Qin

The title N-heterocyclic carbene compound, C(21)H(22)N(4) (2+)·2PF(6) (-), crystallizes as an inversion twin. There are two independent N-heterocyclic carbene dications (A and B) and four independent hexa-fluoro-phosphate anions in the asymmetric unit. The cations are L-shaped with the benzene rings being inclined to one another by 88.82 (16)° in cation A and 87.03 (16)° in cation B. The imidaz...

2013
Rajeev Kharb Mandeep Kaur Anil Kumar Sharma

Emergence of resistance by bacterial and fungal stains towards existing antimicrobial agents is one of the major problem as well as motivation to synthesize a new class of antimicrobial agents possessing potent activity compared to commonly used therapy. Coumarin is the heterocyclic compound formed from benzene and pyrone ring containing oxygen and its derivatives are of wide awareness because ...

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