Formation and rearrangement of 8a-benzyl-2-tert-butyl-1(8aH)-naphthalenone, a ketone with a ring system consisting entirely of fused blocked aromatic rings

1987 ◽  
Vol 52 (15) ◽  
pp. 3390-3394 ◽  
Author(s):  
Bernard Miller ◽  
Jamil Baghdadchi
Keyword(s):  
Ring System ◽  
Aromatic Rings ◽  
Tert Butyl

scholarly journals Crystal structure of 2,3-bis(4-methylphenyl)benzo[g]quinoxaline

2018 ◽  
Vol 74 (4) ◽  
pp. 548-550
Author(s):  
Young-Inn Kim ◽  
Seong-Jae Yun ◽  
Sung Kwon Kang
Keyword(s):  
Crystal Structure ◽  
Rotation Axis ◽  
Ring System ◽  
Dihedral Angles ◽  
Aromatic Rings ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Compound C ◽  
Organic Light ◽  
Phenyl Rings

The title compound, C26H20N2, was obtained during a search for new π-extended ligands with the potential to generate efficient phosphors with iridium(III) for organic light-emitting devices (OLEDs). The benzoquinoxaline ring system is almost planar (r.m.s. deviation = 0.076 Å). A pseudo-twofold rotation axis runs through the midpoints of the C2—C3 and C9—C10 bonds. The two phenyl rings are twisted relative to the benzoquinoxaline ring system, making dihedral angles of 53.91 (4) and 36.86 (6)°. In the crystal, C—H...π (arene) interactions link the molecules, but no π–π interactions between aromatic rings are observed.

Behavior of 1,3-Di(tert-butyl)-2,4-bis(tetramethylpiperidino)-1,3,2,4-diphospha- diboretane towards Boron Halides and Adduct Formation of a Bicyclo[1.1.0]diphosphadiboretane with Tris(pentafluorophenyl)borane [1]

2006 ◽  
Vol 61 (3) ◽  
pp. 265-274 ◽  
Author(s):  
Klaus Knabel ◽  
Heinrich Nöth ◽  
Robert T. Paine
Keyword(s):  
Molecular Structure ◽  
Structure Analysis ◽  
Adduct Formation ◽  
Ring System ◽  
Lewis Acidity ◽  
X Ray ◽  
Tert Butyl ◽  
Boron Halides ◽  
System 2

AbstractWhile the diphosphadiboretane (tBuP=Btmp)2, 1, reacts with boron trihalides BX3 (X = Cl, Br, I) with BN cleavage producing a number of unidentifiable products, a new tricyclic BP ring system 2, containing B3P3, PB2C2 and C6 rings, results from the combination of PhBCl2 and 1. B-Chlorocatecholborane and 1 give access to the diborylphosphane 3, tmpBCl-PtBu-cat (cat = C6H4O2B). This shows that the selectivity of the reactions increases as the Lewis acidity of boron halide decreases. The structure of compounds 2 and 3 were determined by X-ray structure analysis. The bicyclic (tmpBP)2 4 forms no adducts with MeI, CF3SO2Me or Ph3C(SnCl5). However, it adds B(C6F5)3 to give 10, the first BX3 adduct of this bicycle that is fully characterized including its molecular structure.

scholarly journals Ethyl (4-{[(diethylcarbamothioyl)sulfanyl]methyl}-2-oxo-2H-chromen-7-yl)carbamate

2014 ◽  
Vol 70 (2) ◽  
pp. o219-o220
Author(s):  
K. R. Roopashree ◽  
K. Mahesh Kumar ◽  
B. R. Anitha ◽  
A. J. Ravi ◽  
H. C. Devarajegowda
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Molecular Conformation ◽  
Ring System ◽  
Two Dimensional ◽  
Aromatic Rings ◽  
Compound C ◽  
Centroid Distance ◽  
Ring Motif ◽  
Chromene Ring

In the title compound, C18H22N2O4S2, the 2H-chromene ring system is essentially planar (r.m.s. deviation = 0.012 Å). The molecular conformation is stabilized by a C—H...O hydrogen bond. In the crystal, N—H...S and C—H...O hydrogen bonds occur, the former enclosing anR22(22) ring motif, and lead to the formation of a two-dimensional slab-like network lying parallel to (10-1). π–π interactions are observed between inversion-related aromatic rings [shortest centroid–centroid distance = 3.6300 (11) Å].

scholarly journals 3′-(4-Chlorophenyl)-4′-phenyl-3H,4′H-spiro[benzo[b]thiophene-2,5′-isoxazol]-3-one

IUCrData ◽  
2017 ◽  
Vol 2 (5) ◽  
Author(s):  
Mohamed Bakhouch ◽  
Mohamed El Yazidi ◽  
Ghali Al Houari ◽  
Mohamed Saadi ◽  
Lahcen El Ammari
Keyword(s):  
Hydrogen Bonds ◽  
Phenyl Ring ◽  
Three Dimensional ◽  
Ring System ◽  
Dihedral Angles ◽  
Aromatic Rings ◽  
Isoxazole Ring ◽  
Compound C ◽  
Dimensional Network ◽  
The Mean

The molecule of the title compound, C22H14ClNO2S, is built up from an isoxazole ring linked to a benzothiophene ring system with additional phenyl and 4-chlorophenyl substituents. The benzothiophene system is virtually planar with the largest deviation from the mean plane being 0.041 (2) Å, while the isoxazole ring adopts an envelope conformation. The plane of the benzothiophene ring system is almost perpendicular to those of the phenyl and the 4-chlorophenyl rings, with dihedral angles of 64.76 (10) and 82.81 (10)°, respectively, between them. The phenyl ring is inclined by 85.76 (12)° to the plane of the 4-chlorophenyl ring, which in turn lies close to the plane of the isoxazole ring. In the crystal, molecules are linked by weak C—H...O hydrogen bonds and offset π–π interactions between the aromatic rings of adjacent benzothiophene ring systems. These combine to form a three-dimensional network structure.

scholarly journals Synthesis and characterization of some new tebufenozide analogues and study their toxicological effect against Spodoptera littoralis (Boisd.)

2022 ◽  
Vol 11 (1) ◽  
pp. 63-68 ◽  
Author(s):  
Omar M. Elhady ◽  
Erian. S. Mansour ◽  
M. M. Elwassimy ◽  
Sameh A. Zawam ◽  
Ali M. Drar
Keyword(s):  
Spodoptera Littoralis ◽  
Chemical Change ◽  
Cotton Leaf ◽  
Aromatic Rings ◽  
Toxicological Study ◽  
Toxicological Effect ◽  
Tert Butyl ◽  
Toxicological Activity ◽  
Concentration Levels

Many of mimic analogues synthesized before depending on the change in the structure of aromatic rings. In this work, the carbonyl group in the structure of compounds 1-4 converted to thiocarbonyl group, and then studying the toxicological activity due to chemical change in the active center of mimic analogues was performed for compounds N-tert-butyl-2,4-dichloro-N'-(2,4-dichlorobenzoyl)benzohydrazide (2) and N-tert-butyl-2,4-dichloro-N'-[(2,4-dichlorophenyl)carbonothioyl]benzenecarbothiohydrazide (6). The toxicological study was done by using 2nd and 4th instar larvae of the cotton leaf worm, Spodoptera littoralis (Boisd.). Five concentration levels (600, 300, 150, 75 and 37.5 ppm) of compounds (2) and (6) were applied on the fresh plant food to the newly grown (2nd and 4th) instar larvae.

scholarly journals Crystal structure of (3,5-dichloro-2-hydroxyphenyl){1-[(naphthalen-1-yl)carbonyl]-1H-pyrazol-4-yl}methanone

2014 ◽  
Vol 70 (12) ◽  
pp. 522-524
Author(s):  
Yoshinobu Ishikawa ◽  
Yuya Motohashi
Keyword(s):  
Phenyl Ring ◽  
Pyrazole Ring ◽  
Ring System ◽  
Dihedral Angles ◽  
Stacking Interactions ◽  
Naphthalene Ring ◽  
Aromatic Rings ◽  
Compound C ◽  
Phenyl Rings ◽  
Ring Centroid

The title compound, C21H12Cl2N2O3, is a 1,4-diaroyl pyrazole derivative and has three aromatic rings. The dihedral angles between the naphthalene ring system and the pyrazole ring, the pyrazole and phenyl rings and the naphthalene ring system and the phenyl ring are 49.44 (13), 49.87 (16) and 0.58 (11)°, respectively. The phenolic proton forms an intramolecular O—H...O hydrogen bond with an adjacent carbonyl O atom. In the crystal, the molecules are linked through stacking interactions between the pyrazole rings [centroid–centroid distances = 3.546 (3)] and between the naphthalene ring system and the phenyl ring [centroid–centroid distances = 3.609 (4) Å] along thea-axis direction. The molecules are further connected through C—H...O hydrogen bonds, forming inversion dimers.

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