[PDF] Top 20 Crystal structure of 4 oxo 4H chromene 3 carboxylic acid
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Crystal structure of 4 oxo 4H chromene 3 carboxylic acid
... between the ring carbonyl O atom and the carboxy O—H atom, closing an S(6) loop. In the crystal, molecules are assembled by stacking interactions [centroid–centroid distance between the benzene and pyran rings = ... See full document
9
6,8 Diiodo 4 oxo 4H chromene 3 carbaldehyde
... the crystal structure of 6,8-diiodo-4-oxochromene-3-carbaldehyde, which was prepared by the Vilsmeier–Haack reaction of 2-hy- droxy-3,5-diiodoacetophenone with N , N -dimethylformamide (DMF) ... See full document
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Crystal structure of 4 methoxyphenyl 2 oxo 2H chromene 3 carboxylate
... 2-oxo-2H-chromenes (coumarins) have been also used in the field of medicine, cosmetics and fluorescent dyes. They are efficient fluorophores characterized by good emission quantum yields and are used as materials ... See full document
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6 Methyl 4 oxo 4H chromene 3 carbaldehyde
... The structure of title compound (Fig. 1) is composed of a planar chromone moiety (O1/C1–C9) with maximum deviation of 0.045 (2) Å for atom C8. Bond lengths and angles are similar to those observed in a ... See full document
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6 Fluoro 4 oxo 4H chromene 3 carbaldehyde
... the crystal, the molecules are linked via C—H···O hydrogen bonds and are further linked by π—π stacking interactions between the chromone units [centroid– centroid distance between the benzene and pyran rings = ... See full document
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Crystal structures of ethyl 6 (4 methylphenyl) 4 oxo 4H chromene 2 carboxylate and ethyl 6 (4 fluorophenyl) 4 oxo 4H chromene 2 carboxylate
... Fig. 3, the molecules may have any conformation between two possible extremes: conformation A where the carbonyl groups are trans-related and conformation B where they are cis- ... See full document
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6 Chloro 4 oxo 4H chromene 3 carbaldehyde
... 1964), as shown in the middle of Fig. 2. Thus, it is concluded that there is no halogen bond in the title compound. The C– Cl···O and Cl···O=C angles are 166.30 (8) and 166.69 (14)°, respectively. The latter angle is ... See full document
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8 Fluoro 4 oxo 4H chromene 3 carbaldehyde
... the crystal, the molecules are linked via C–H···O hydrogen bonds along the a axis and (1,0,1) to form corrugated layers parallel to (010) and via π–π stacking interaction [Cg–Cg distance between the pyran and ... See full document
9
6 Iodo 4 oxo 4H chromene 3 carbaldehyde
... monohalogenated 3-formylchromone derivatives 6-fluoro-4-oxo-4 H -chromene-3-carbaldehyde (Ishikawa, 2014 c , ...the crystal structure of a monoiodinated ... See full document
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3 Hydroxy 4 oxo 2 phenyl 4H chromene 6 carboxylic acid dimethylformamide solvate
... Flavonols have long been an important class of flavonoids with interesting pharmacological properties (Hammad & Abdalla, 1997). Being widely present in nature, they are usually obtained by extraction from plants. ... See full document
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8 Chloro 4 oxo 4H chromene 3 carbaldehyde
... the crystal structures of chlorinated 3- formylchromone derivatives 6,8-dichloro-4-oxochromene-3-carbaldehyde (Ishikawa & Motohashi, 2013, ...the crystal structure of a ... See full document
9
Crystal structure of 2 amino 7 hydroxy 4 (4 hydroxyphenyl) 4H chromene 3 carbonitrile
... the crystal structure, N—H···O, O—H···O, O—H···N and C—H···O hydrogen bonds link the adjacent molecules, forming the three dimensional network (Table 1, ...the 4H-chromene ring system ... See full document
8
6 Chloro 8 nitro 4 oxo 4H chromene 3 carbaldehyde
... the crystal structures of a dichlorinated 3-formylchromone derivative 6,8-dichloro-4-oxochromene-3-carbaldehyde (Ishikawa & Motohashi, 2013) and a monochlorinated 3-formylchromone ... See full document
9
6 Chloro 7 fluoro 4 oxo 4H chromene 3 carbaldehyde
... and crystal engineering (Auffinger et ...the crystal structures of chlorinated 3-formylchromone derivatives 6,8-dichloro-4-oxochromene-3-carbaldehyde (Ishikawa & Motohashi, 2013) ... See full document
10
6 Chloro 7 methyl 4 oxo 4H chromene 3 carbaldehyde
... and crystal engineering (Auffinger et ...the crystal structures of halogenated 3-formylchromone derivatives 6,8-dichloro-4-oxochromene-3-carbaldehyde (Ishikawa & Motohashi, 2013) ... See full document
9
Polymorphism in the structure of N (5 methylthiazol 2 yl) 4 oxo 4H chromene 3 carboxamide
... Chromone-3-carboxylic acid, phosphorus(V) oxychloride, di- methylformamide (DMF) and 5-methylthiazol-2-amine were purchased from Sigma–Aldrich Quı´mica ... See full document
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Crystal structure of 2 amino 4 (4 methoxyphenyl) 4H benzo[g]chromene 3 carbonitrile
... In the title compound, Fig. 1, the naphthalene fragment is slightly twisted as indicated by the dihedral angle of 3.2 (2)° between the two 6-membered rings. The pendant 4-methoxyphenyl ring makes a dihedral angle ... See full document
9
Crystal structure of 7,8 dichloro 4 oxo 4H chromene 3 carbaldehyde
... ring and the formyl plane is 8.64 (7) . In the crystal, molecules are linked through – stacking interactions [centroid–centroid distance between the benzene and pyran rings = 3.727 (2) A ˚ ], C—H O hydrogen bonds ... See full document
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Crystal structure of 8 bromo 4 oxo 4H chromene 3 carbaldehyde
... Br1 0.0141 (2) 0.0192 (3) 0.0204 (2) 0.0019 (2) 0.00822 (16) 0.0016 (2) O1 0.0123 (13) 0.0238 (16) 0.0188 (14) 0.0028 (13) 0.0093 (12) 0.0037 (14) O2 0.0140 (15) 0.034 (2) 0.0266 (17) 0.0055 (15) 0.0090 (13) ... See full document
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Crystal structure of 6 bromo 7 fluoro 4 oxo 4H chromene 3 carbaldehyde
... and crystal engi- neering (Auffinger et ...the crystal structures of the halogenated 3-formylchromone deri- vatives 6-chloro-4-oxo-4H-chromene-3-carbaldehyde (Ishi- ... See full document
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