نتایج جستجو برای: 14 aryl 14h dibenzoxanthene

تعداد نتایج: 373509  

2008
B. Thimme Gowda Sabine Foro K. S. Babitha Hartmut Fuess

The conformation of the C=O bond in the title compound 2MP4MBA, C(15)H(14)O(2), is anti to the ortho-methyl group in the phen-oxy ring. The bond parameters in 2MP4MBA are similar to those in 3-methyl-phenyl 4-methyl-benzoate (3MP4MBA), 4-methyl-phenyl 4-methyl-benzoate (4MP4MBA) and other aryl benzoates. The dihedral angle between the two aromatic rings in 2MP4MBA is 73.04 (8)°.

2007
Gabriel Navarrete-Vázquez Hermenegilda Moreno-Diaz Rafael Villalobos-Molina Samuel Estrada-Soto Hugo Tlahuext

The title compound, C(15)H(14)N(2)O(3)S(2), is of inter-est with respect to its biological activity. The crystal structure is stabilized by inter-molecular N-H⋯N, C-H⋯O and C-H⋯π hydrogen-bonding inter-actions, as well as offset π-π inter-actions [distance between the centroids of the aryl and thiazole rings of adjacent molecules of 3.954 (2) Å].

2014
Nishanka Dilini Ratnayake Nan Liu Leslie A. Kuhn Kevin D. Walker

7 ABSTRACT: β-Amino acids are emerging as an important class of 8 compounds in medicinal chemistry. β-Aryl-β-alanines show antiepilepto9 genesis activity, while others have been used to synthesize antibiotic β10 peptides. To assess the utility of a methylidene imidazolone-dependent 11 Pantoea agglomerans phenylalanine aminomutase (PaPAM) for making 12 non-natural β-amino acids, we surveyed the ...

2010
Nisar Hussain Habib-ur-Rehman Masood Parvez

THE TITLE COMPOUND [SYSTEMATIC NAME: 17-(5,6-di-methyl-hept-6-en-2-yl)-4,4,10,13,14-penta-methyl-1,5,6,10,11,12,13,15,16,17-deca-hydro-2H-cyclo-penta-[α]phenanthren-3(4H,9H,14H)-one], C(31)H(50)O, is a triterpenoid which was isolated from Skimmia laureola. The three six-membered rings adopt chair, slightly distorted half-chair and distorted boat conformations, and the five-membered ring is in a...

Journal: :Molecules 2016
Ndumiso Thamsanqa Ndlovu Winston Nxumalo

An investigation on the effect of substituent at the 2-position of mono-substituted quinoxalines in the synthesis of di-substituted quinoxaline derivatives via nucleophilic substitution reactions, is reported. Di-substituted quinoxalines bearing aryl-alky, aryl-aryl, aryl-heteroaryl, aryl-alkynyl, and amino-alkyl substituents were prepared in moderate to good yields. 2-Monosubstituted quinoxali...

Journal: :Journal of Cosmology and Astroparticle Physics 2016

2013
Navid Dastbaravardeh Michael Schnürch Marko D Mihovilovic

The ruthenium(II)-catalyzed sp3 C-H bond arylation of benzylic amines with aryl halides is reported. In the present method, aryl iodides and, more importantly, also the cheaper aryl bromides and aryl chlorides can be applied as aryl sources. Additionally, the method does not require elaborate manipulations in a glove box and can be carried out in simple screw cap vials. Potassium pivalate prove...

Journal: :journal of sciences islamic republic of iran 0

6-carbethoxy-5-(3'-bromophenyl)-3-aryl-2-cyclohexenones 2a-j were obtained from the1-aryl-3-(3'-bromophenyl)-2-propene-1-ones 1a-j by micheal addition of ethyl acetoacetate, followed by internal claisen condensation. reaction of 2a-j with hydrazine hydrate afforded the corresponding 6-aryl-4-(3'-bromophenyl)-3-oxo-2,3a,4,5-tetrahydro-2h-indazoles 3a-j. the structures of newly syn...

Journal: :organic chemistry research 0
mehrnoosh kangani department of chemistry, university of sistan and baluchestan, p.o. box 98135 – 674, zahedan, iran nourallah hazeri department of chemistry, faculty of sciences, university of sistan and baluchestan, zahedan 98135-674, iran malek taher maghsoodlou department of chemistry, university of sistan and baluchestan, p.o. box 98135 – 674, zahedan, iran ali ebrahimi department of chemistry, university of sistan and baluchestan, p.o. box 98135 – 674, zahedan, iran

cellulose was applied as a reusable and green catalyst for the facile four-component synthesis of 6-amino-4-aryl-3-methyl-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile derivatives using hydrazine monohydrate, ethyl acetoacetate, malononitrile and aryl aldehydes, under solvent-free and thermal conditions. the use of non-toxic and inexpensive catalyst, short reaction time, clean work-up and goo...

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