scholarly journals Notizen: Versuche zur Kondensation von Hexamethyl-4.4-bis(methylamino)cyclo-1.2.4-trisila-diazan / Attempts for the Condensation of Hexamethyl-4.4-bis(methylamino)cyclo-1,2,4-trisila-diazane

1977 ◽  
Vol 32 (8) ◽  
pp. 954-955 ◽  
Author(s):  
Merten Schlingmann ◽  
Ulrich Wannagat
Keyword(s):  
Title Compound ◽  
Ring System ◽  
Membered Ring

It was not possible to condensate the Si(NHCH3)2 unit of the title compound to a six-membered ring system. Instead a novel dispiro compound with an OSO unit inside the framework was obtained using (NH4)2SO4 as a catalyst (Scheme 1).

scholarly journals Crystal structure of (E)-13-(pyrimidin-5-yl)parthenolide

2015 ◽  
Vol 71 (12) ◽  
pp. 1536-1538 ◽  
Author(s):  
Shobanbabu Bommagani ◽  
Narsimha R. Penthala ◽  
Sean Parkin ◽  
Peter A. Crooks
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Heck Reaction ◽  
Lactone Ring ◽  
Chair Conformation ◽  
Ring System ◽  
Membered Ring ◽  
Reaction Conditions ◽  
Compound C ◽  
Pyrimidine Moiety

The title compound, C19H22N2O3, {systematic name (1aR,4E,7aS,8E,10aS,10bR)-1a,5-dimethyl-8-[(pyrimidin-5-yl)methylidene]-2,3,6,7,7a,8,10a,10b-octahydrooxireno[2′,3′:9,10]cyclodeca[1,2-b]furan-9(1aH)-one} was obtained from the reaction of parthenolide [systematic name (1aR,7aS,10aS,10bR,E)-1a,5-dimethyl-8-methylene-2,3,6,7,7a,8,10a,10b-octahydrooxireno[2′,3′:9,10]cyclodeca[1,2-b]furan-9(1aH)-one] with 5-bromopyrimidine under Heck reaction conditions, and was identified as anEisomer. The molecule possesses ten-, five- (lactone) and three-membered (epoxide) rings with a pyrimidine group as a substituent. The ten-membered ring displays an approximate chair–chair conformation, while the lactone ring shows a flattened envelope-type conformation. The dihedral angle between the pyrimidine moiety and the lactone ring system is 29.43 (7)°.

scholarly journals Crystal structure of 2-amino-N-(2-fluorophenyl)-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxamide

2015 ◽  
Vol 71 (11) ◽  
pp. o807-o808
Author(s):  
K. Chandra Kumar ◽  
V. Umesh ◽  
T. K. Madhura ◽  
B. M. Rajesh ◽  
Chandra
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Dihedral Angle ◽  
Title Compound ◽  
Molecular Conformation ◽  
Chair Conformation ◽  
Ring System ◽  
Membered Ring ◽  
Compound C

In the title compound, C15H15FN2OS, the dihedral angle between the planes of the benzothiophene ring system and the fluorobenzene ring is 3.74 (14)°. The six-membered ring of the benzothiophene moiety adopts a half-chair conformation. The molecular conformation is consolidated by intramolecular N—H...F and N—H...O hydrogen bonds. In the crystal, molecules are linked by N—H...O hydrogen bonds, generatingC(6) [001] chains.

scholarly journals Methyl 2-((2Z,5Z)-4-oxo-3-phenyl-2-{2-[(1E)-1,2,3,4-tetrahydronaphthalen-1-ylidene]hydrazin-1-ylidene}-1,3-thiazolidin-5-ylidene)acetate

2014 ◽  
Vol 70 (4) ◽  
pp. o436-o437 ◽  
Author(s):  
Joel T. Mague ◽  
Mehmet Akkurt ◽  
Shaaban K. Mohamed ◽  
Alaa A. Hassan ◽  
Mustafa R. Albayati
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Molecular Conformation ◽  
Ring System ◽  
Membered Ring ◽  
Envelope Conformation ◽  
Compound C

In the title compound, C22H19N3O3S, the six-membered ring of the 1,2,3,4-tetrahydronaphthalene ring system adopts an envelope conformation with the central CH2C atom as the flap. The molecular conformation is stabilized by an S...O contact, forming a pseudo-five-membered ring. In the crystal, molecules are linkedviaC—H...O hydrogen bonds into chains propagating along [102].

scholarly journals Crystal structure of 1-iodo-3-{[4-(tert-butylsulfanyl)phenyl]ethynyl}azulene

2015 ◽  
Vol 71 (8) ◽  
pp. o544-o545 ◽  
Author(s):  
Sebastian Förster ◽  
Wilhelm Seichter ◽  
Edwin Weber
Keyword(s):  
Crystal Structure ◽  
Benzene Ring ◽  
Dihedral Angle ◽  
Title Compound ◽  
Iodine Atom ◽  
Ring System ◽  
Membered Ring ◽  
Compound C

The title compound, C20H19IS, features a 1,3-disubstituted azulene involving an ethynylene elongated 4-(tert-butylsulfanyl)phenyl sidearm and an iodine atom as the substituents. The azulene ring system is almost planar (r.m.s. deviation = 0.012 Å) and subtends a dihedral angle of 35.7 (1)° with the benzene ring. As a result of the inherent dipole character of the azulene core, a supramolecular π–π dimer [separation between the centroids of the five- and seven-membered rings = 3.7632 (10) Å] with antiparallel orientated molecules can be observed in the crystal. The packing is consolidated by an unusual I...π(acetylene) contact [I...Cg= 3.34 Å, C—I...Cg= 173.3°], and a very weak C—H...π interaction is also found in the structure, with the azulene five-membered ring as the acceptor.

scholarly journals N-[(1,3-Benzodioxol-5-yl)methyl]benzenesulfonamide: an analogue of capsaicin

2013 ◽  
Vol 69 (11) ◽  
pp. o1700-o1700 ◽  
Author(s):  
Stella H. Maganhi ◽  
Maurício T. Tavares ◽  
Mariana C. F. C. B. Damião ◽  
Roberto Parise Filho
Keyword(s):  
Title Compound ◽  
Phenyl Ring ◽  
Ring System ◽  
Membered Ring ◽  
The Other ◽  
Compound C ◽  
Fused Ring ◽  
The Mean ◽  
Fused Ring System ◽  
Aliphatic Amide

The title compound, C14H13NO4S, an analogue of capsaicin, differs from the latter by having a 1,3-benzodioxole ring rather than a 2-methoxyphenol moiety, and having a benzenesulfonamide group instead of an aliphatic amide chain. The five-membered ring is in an envelope conformation with the methylene C atom lying 0.221 (6) Å out of the plane formed by the other four atoms. The dihedral angle between the phenyl ring and the mean plane of the 1,3-benzodioxole fused-ring system is 84.65 (4)°. In the crystal, molecules aggregate into supramolecular layers in theacplane through C—H...O, N—H...O and C—H...π interactions.

scholarly journals Crystal structure of 2-amino-4-(4-methoxyphenyl)-4H-benzo[g]chromene-3-carbonitrile

2015 ◽  
Vol 71 (12) ◽  
pp. o1017-o1018
Author(s):  
Joel T. Mague ◽  
Shaaban K. Mohamed ◽  
Mehmet Akkurt ◽  
Sabry H. H. Younes ◽  
Mustafa R. Albayati
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Dihedral Angle ◽  
Title Compound ◽  
Ring System ◽  
Membered Ring ◽  
Axis Direction ◽  
Compound C ◽  
Naphthalene Fragment ◽  
Chromene Ring

In the title compound, C21H16N2O2, the naphthalene fragment is twisted slightly, as indicated by the dihedral angle of 3.2 (2)° between the two six-membered rings. The pendant 4-methoxyphenyl ring makes a dihedral angle of 86.08 (6)° with the central six-membered ring of the 4H-benzo[g]chromene ring system. In the crystal, molecules are linked by pairs of N—H...N hydrogen bonds, forming inversion dimers which are linked into chains propagating in theb-axis direction by N—H...O hydrogen bonds.

scholarly journals Crystal structure of (E)-1-{2-[(5,5-dimethyl-1,3,2-dioxaphosphinan-2-yl)oxy]naphthalen-1-yl}-N-(4-fluorophenyl)methanimine

2015 ◽  
Vol 71 (1) ◽  
pp. 85-87
Author(s):  
Musa A. Said ◽  
Bayan L. Al Belewi ◽  
David L. Hughes
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Chair Conformation ◽  
Ring System ◽  
Membered Ring ◽  
Naphthalene Ring ◽  
Π Interactions ◽  
Compound C

In the title compound, C22H21FNO3P, a 1,3,2-dioxaphosphinan-2-yloxy derivative, three O atoms are bonded in a trigonal–pyramidal manner to the P atom. The exocyclic P—O bond is significantly longer than the two endocyclic P—O bonds,viz.1.6678 (12) Å compared to 1.6046 (13) and 1.6096 (12) Å. The six-membered ring which includes the P atom has a chair conformation. The fluorophenyl ring is inclined to the naphthalene ring system by 24.42 (7)°. In the crystal, molecules are linkedviaC—H...π interactions, forming slabs lying parallel to (10-1).

scholarly journals Ethyl 2-(6-bromo-2-phenyl-1H-imidazo[4,5-b]pyridin-1-yl)acetate

IUCrData ◽  
2016 ◽  
Vol 1 (5) ◽  
Author(s):  
Mohammed Yassin Hjouji ◽  
Youssef Kandri Rodi ◽  
Joel T. Mague ◽  
Younes Ouzidan ◽  
El Mokhtar Essassi ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Phenyl Ring ◽  
Ring System ◽  
Membered Ring ◽  
Dihedral Angles ◽  
Compound C ◽  
Fused Ring ◽  
The Mean ◽  
Fused Ring System

In the title compound, C16H14BrN3O2, the fused-ring system is essentially planar, with the largest deviation from the mean plane being 0.0216 (15) Å for the substituted N atom of the five-membered ring, the plane of which makes dihedral angles of 28.50 (7) and 77.48 (7)° with the terminal phenyl ring and the ethoxycarbonylmethyl group mean planes, respectively. In the crystal, C—H...N hydrogen bonds link the molecules into inversion dimers. These combine with weak C—H...N contacts to stack the molecules into columns along theb-axis direction.

scholarly journals 3-(2,4-Difluorophenyl)-1-(pyridin-4-yl)benzo[4,5]imidazo[1,2-d][1,2,4]triazin-4(3H)-one

IUCrData ◽  
2016 ◽  
Vol 1 (9) ◽  
Author(s):  
Bassam Abu Thaher ◽  
Dieter Schollmeyer ◽  
Basem Qeshta ◽  
Hans-Peter Deigner
Keyword(s):  
Dihedral Angle ◽  
Title Compound ◽  
Pyridine Ring ◽  
Crystal Packing ◽  
Ring System ◽  
Membered Ring ◽  
Π Interactions ◽  
Compound C ◽  
Shortest Distance

In the title compound, C20H11F2N5O, the central 13-membered ring system (r.m.s. deviation = 0.028 Å) makes a dihedral angle of 53.13 (7)° with the difluorophenyl ring and 79.98 (7)° with the pyridine ring. The crystal packing features aromatic π–π interactions between the 13-membered rings [shortest distance between ring centroids = 3.5682 (8) Å].

scholarly journals 1-(Pyridin-4-yl)-3-(2,4,6-trichlorophenyl)benz[4,5]imidazo[1,2-d][1,2,4]triazin-4(3H)-one

IUCrData ◽  
2016 ◽  
Vol 1 (10) ◽  
Author(s):  
Bassam Abu Thaher ◽  
Dieter Schollmeyer ◽  
Basem Qeshta ◽  
Kanan M. Wahedy ◽  
Ihab M. Almasri ◽  
...  
Keyword(s):  
Title Compound ◽  
Pyridine Ring ◽  
Crystal Packing ◽  
Ring System ◽  
Membered Ring ◽  
Dihedral Angles ◽  
Ring Systems ◽  
Π Interactions ◽  
Compound C ◽  
Centroid Distance

In the title compound, C20H10Cl3N5O, the 13-membered ring system makes dihedral angles of 78.64 (9)° with the trichlorophenyl ring and 62.60 (10)° with the pyridine ring. The crystal packing is dominated by π–π interactions between the 13-membered ring systems [centroid–centroid distance = 3.6655 (11)°].

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