[PDF] Top 20 7 Methoxy 2,3 dihydro 1H cyclopenta[b]chromen 1 one
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7 Methoxy 2,3 dihydro 1H cyclopenta[b]chromen 1 one
... Selected geometric parameters are listed in Table 1. An ellipsoid plot of the molecule is shown in Fig. 1. The molecule contains three fused rings. The pyran ring adopts a half-chair conformation. The ... See full document
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2′ (2 Chlorophenyl) 1′ nitro 2′,3′,4′,5′,6′,7′ hexahydro 1H indole 3 spiro 3′ 1′H pyrrolizin 2(3H) one
... of 2-chloronitrostyrene (1 mmol), isatin (1 mmol) and proline (1 mmol) in methanol (20 ml) was refluxed until the disap- pearance of the starting ... See full document
11
Redetermination of 3 [(Z) 1 hydroxy 3 oxobutenyl] 2H chromen 2 one at 193 K
... synthesized by the reaction of salicylaldehyde and 4-hydroxy- 6-methyl-2H-pyran-2-one in the presence of triethylbenzyl- ammonium chloride in aqueous media, was previously determined at room temperature ... See full document
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6 Hexyl 7 hydroxy 3 (3 phenyl 1H 1,2,4 triazol 5 yl) 2H chromen 2 one monohydrate
... triazole ring. These dihedral angles, together with the torsion angles C4ÐC3ÐC11ÐN1, C2ÐC3ÐC11ÐN2, N1ÐC12Ð C13ÐC18 and N3ÐC12ÐC13ÐC14 (Table 1) show that the three rings are slightly rotated with respect to each ... See full document
8
Structure of 7 hydroxy 3 (2 methoxyphenyl) 2 trifluoromethyl 4H chromen 4 one
... a 3-phenyl- chromen-4-one (3-phenyl-1,4-benzopyrone) backbone instead of the 2-phenylchromen-4-one (3-phenyl-1,4-benzopyrone) structure of flavanones and flavones (Szeja ... See full document
10
Coumarins via knoevenagel condensation reaction (KCR) and pechmann condesation reaction
... as 3-acetylcoumarin, 3-acetyl-7-(diethylamino)coumarin, and 7-(diethylamino)-3- (1-oxobutyl)coumarin were synthesized by KCR method which involved the condensation of ... See full document
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4 Methyl 7 [3 (4 o tolylpiperazin 1 yl)propoxy] 2H chromen 2 one
... The crystal packing of (I) shows an intermolecular – interaction and a C—H O hydrogen bond. Ring B stacks with a symmetry-equivalent ring at (2 x, 1 y, z), with an interplanar distance of 3.48 ... See full document
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Crystal structure of 3 [4 (benzyloxy)phenyl] 2,3 dihydro 1H benzo[f]chromen 1 one
... Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 ... See full document
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2 (1 Benzyl 1H indol 3 ylmethylene) 1 azabicyclo[2 2 2]octan 3 one
... added 1-aza-bicyclo[2.2.2]- octan-3-one hydrochloride ...in one portion and stirring was continued until the mixture completely dissolved (20 ...of 1- ... See full document
9
7 Diethylamino 3 [(2Z) 3 (6 methoxy 2 naphthyl)prop 2 enoyl] 2H chromen 2 one
... viz. 3-acetyl-7-(diethylamino)coumarin (Hamaker & McCully, 2006), 3-acetyl-6-chloro-2H-chromen-2-one (Chopra et ...and ... See full document
8
1 Methyl 3 (2 oxo 2H chromen 3 yl) 1H imidazol 3 ium picrate
... (Table 1) as well as the π–π stacking interactions between the almost parallel aromatic moieties [the dihedral angle between the mean planes of the 2H-chromen (cation) and benzene (anion) fragments is ... See full document
10
3 [2 (Triphenylphosphanylidene)acetyl] 2H chromen 2 one
... The bond distances and angles in the title compound (Fig. 1) agree very well with the corresponding bond distances and angles reported in a closely related compound (Schobert et al., 2000). In the title molecule, ... See full document
9
(Z) 3 (1 Hydroxy 3 oxobut 1 enyl) 6 nitro 2H chromen 2 one
... A solution of 4-hydroxy-6-methyl-3-(2-(methylamino)-3,6-dinitro-4H-chromen-4-yl)-2H-pyran-2-one (0.010 g, 0.266 mmol) in ethanol (15 ml) was heated to reflux for 25 min by which time ... See full document
8
3 Benzoylmethylene 1 methyl 3,4 dihydroquinoxalin 2(1H) one
... The photochemical reactions of compounds containing the C N double bond have not been as extensively investigated as those of carbonyl compounds. Nishio (1984) discovered that irradiation of quinoxalin-2-ones with ... See full document
7
7 Nitro 2,3 dihydro 1H cyclopenta[b]chromen 1 one
... The title compound was synthesized by Baylis±Hillman reactions. At room temperature, a clear solution of 5-nitrosalicylaldehyde (1 mmol), cyclopent-2-enone (2 mmol) and imidazole (1 mmol) in ... See full document
8
2 (Di phenyl methyl idene) 2,3 di hydro 1H inden 1 one
... with the dihedral angles 70.30 (12)° and 44.74 (13)°, respectively. The torsion angles of these two benzene groups are [C14—C7—C8—C9] = 56.4 (3)° and [C14—C7—C6—C5] = 36.5 (4)°. The rest of the molecule is ... See full document
9
MASS SPECTRAL STUDY ON THE FRAGMENTATION OF 3 [2 (3,5 DIMETHYL 1H PYRAZOL 1 YL)THIAZOL 4 YL] 2H CHROMEN 2 ONE BY AM1 METHOD
... Thiazole with two hetero atoms sulphur and nitrogen at 1,3-positions is found in many applications [1] such as anti-cancer [2] , anti bacterial [3] , anti-malarial [4] , anti-tubercular [5] , ... See full document
10
A facile synthesis, characterization of N substituted 7 methoxy 3 phenyl 4 (3 piperizin 1 yl propaxy) chromen 2 one
... To a solution of 4-[3-(7-Methoxy-2-oxo-3-phenyl-2H-chromen-4-yloxy)-propyl]-piperazine-1-carboxylic acid tert- butyl ester (4) (10g, 20.24mmol) in DCM (5vol, 50mL) was added TFA ... See full document
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Crystal structure of 7 [(2E) 2 benzylidene 3 oxobutoxy] 4 methyl 2H chromen 2 one
... C35 0.0454 (7) 0.0492 (7) 0.0348 (6) 0.0043 (6) −0.0035 (5) −0.0045 (5) C36 0.0536 (9) 0.0573 (9) 0.0480 (8) 0.0108 (7) 0.0037 (7) −0.0078 (6) C37 0.0534 (8) 0.0515 (8) 0.0526 (8) 0.0113 ... See full document
13
Synthesis and Characterization of SomeBiologically Potent 2-(2-butyl-4-chloro-1H-imidazol-5-yl)-4H-chromen-4-onederivatives
... Equimolar amount of substituted o-hydroxy acetophenones and 2-butyl-4-chloro-1H-imidazole-5- carbaldehyde were taken in 100 ml RB flask with minimum amount of PEG-400. To this mixture KOH solution (40%) was ... See full document
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