ChemInform Abstract: A RING TRANSFORMATION OF URACIL INTO THE PYRAZOLE RING SYSTEM. REINVESTIGATION OF THE REACTION OF 5-FORMYLURACILS WITH HYDRAZINES

1982 ◽  
Vol 13 (24) ◽  
Author(s):  
K. HIROTA ◽  
Y. KITADE ◽  
K. SHIMADA ◽  
S. SENDA
Keyword(s):  
Pyrazole Ring ◽  
Ring System ◽  
Ring Transformation

scholarly journals A ring transformation of uracil into the pyrazole ring system. Reinvestigation of the reaction of 5-formyluracils with hydrazines.

1981 ◽  
Vol 29 (12) ◽  
pp. 3760-3762 ◽  
Author(s):  
KOSAKU HIROTA ◽  
YUKIO KITADE ◽  
KAORU SHIMADA ◽  
SHIGEO SENDA
Keyword(s):  
Pyrazole Ring ◽  
Ring System ◽  
Ring Transformation

scholarly journals Crystal structure of (Z)-1-(3,4-dichlorophenyl)-3-methyl-4-[(naphthalen-1-ylamino)(p-tolyl)methylidene]-1H-pyrazol-5(4H)-one

2014 ◽  
Vol 70 (9) ◽  
pp. o955-o956 ◽  
Author(s):  
Naresh Sharma ◽  
Sanjay Parihar ◽  
R. N. Jadeja ◽  
Rajni Kant ◽  
Vivek K. Gupta
Keyword(s):  
Benzene Ring ◽  
Three Dimensional ◽  
Pyrazole Ring ◽  
Carbonyl Oxygen ◽  
Ring System ◽  
Dimensional Structure ◽  
Naphthalene Ring ◽  
Compound C ◽  
Schiff Base Compound ◽  
Base Compound

The title Schiff base compound, C28H21Cl2N3O, was synthesized by the condensation of 1-(3,4-dichlorophenyl)-3-methyl-4-(4-methylbenzoyl)-1H-pyrazol-5(4H)-one with 1-aminonaphthalene. Thep-tolyl ring is normal to the pyrazole ring, with a dihedral angle of 88.02 (14)°, and inclined to the naphthalene ring system by 78.60 (12)°. The pyrazole ring is inclined to the naphthalene ring system and the dichloro-substituted benzene ring by 63.30 (12) and 11.03 (13)°, respectively. The amino group and carbonyl oxygen atom are involved in an intramolecular N—H...O hydrogen bond enclosing anS(6) ring motif. There is also a short C—H...O contact involving the carbonyl O atom and the adjacent benzene ring. In the crystal, molecules are linked by C—H...π interactions, forming a three-dimensional structure.

scholarly journals 6-Amino-3-methyl-4-(3,4,5-trimethoxyphenyl)-2,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile

2014 ◽  
Vol 70 (8) ◽  
pp. o875-o876 ◽  
Author(s):  
Naresh Sharma ◽  
Goutam Brahmachari ◽  
Bubun Banerjee ◽  
Rajni Kant ◽  
Vivek K. Gupta
Keyword(s):  
Hydrogen Bonds ◽  
Benzene Ring ◽  
Title Compound ◽  
Pyrazole Ring ◽  
Ring System ◽  
Boat Conformation ◽  
Two Dimensional ◽  
Compound C ◽  
Dimensional Network ◽  
Centroid Distance

In the title compound, C17H18N4O4, the dihedral angle between the benzene ring and 2,4-dihydropyrano[2,3-c]pyrazole ring system is 89.41 (7)°. The pyran moiety adopts a strongly flattened boat conformation. In the crystal, molecules are linked by N—H...N, N—H...O, C—H...N and C—H...O hydrogen bonds into an infinite two-dimensional network parallel to (110). There are π–π interactions between the pyrazole rings in neighbouring layers [centroid–centroid distance = 3.621 (1) Å].

Double Ring-transformation of Uracils to Pyrazolones via Hydantoin Ring System

Heterocycles ◽  
1982 ◽  
Vol 19 (12) ◽  
pp. 2309 ◽  
Author(s):  
Kosaku Hirota ◽  
Yoshihiro Yamada ◽  
Jun-ichi Haruta ◽  
Shigeo Senda
Keyword(s):  
Ring System ◽  
Ring Transformation ◽  
Double Ring

scholarly journals 1-[2,6-Dichloro-4-(trifluoromethyl)phenyl]-3,4-dimethylpyrano[2,3-c]pyrazol-6(1H)-one

2012 ◽  
Vol 68 (8) ◽  
pp. o2350-o2350
Author(s):  
Hoong-Kun Fun ◽  
Wan-Sin Loh ◽  
B. K. Sarojini ◽  
B. J. Mohan ◽  
B. Narayana
Keyword(s):  
Hydrogen Bonds ◽  
Benzene Ring ◽  
Dihedral Angle ◽  
Title Compound ◽  
Pyrazole Ring ◽  
Ring System ◽  
Helical Chain ◽  
Maximum Deviation ◽  
Compound C

In the title compound, C15H9Cl2F3N2O2, the 1,6-dihydropyrano[2,3-c]pyrazole ring system is almost planar, with a maximum deviation of 0.0226 (14) Å, and forms a dihedral angle of 69.90 (6)° with the benzene ring. In the crystal, molecules are linked into a helical chain along thecaxis by C—H...O hydrogen bonds.

A novel ring transformation of uracil into the benzene ring system

1980 ◽  
Vol 17 (2) ◽  
pp. 413-414 ◽  
Author(s):  
Kosaku Hirota ◽  
Yukio Kitade ◽  
Shigeo Senda
Keyword(s):  
Benzene Ring ◽  
Ring System ◽  
Ring Transformation

scholarly journals Crystal structure of 6-amino-4-(3-bromo-4-methoxyphenyl)-3-methyl-2,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile dimethyl sulfoxide monosolvate

2015 ◽  
Vol 71 (7) ◽  
pp. o453-o454 ◽  
Author(s):  
Sammer Yousuf ◽  
Huma Bano ◽  
Munira Taj Muhammad ◽  
Khalid Mohammed Khan
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Dimethyl Sulfoxide ◽  
Benzene Ring ◽  
Dihedral Angle ◽  
Pyrazole Ring ◽  
Ring System ◽  
The Mean

In the pyrazole molecule of the title solvate, C15H13BrN4O2·C2H6OS, the dihedral angle between the benzene ring and the mean plane of the dihydropyrano[2,3-c]pyrazole ring system [r.m.s deviation = 0.031 (2) Å] is 86.71 (14)°. In the crystal, the pyrazole molecules are linked by N—H...N hydrogen bonds, forming a layer parallel to (10-1). The pyrazole and dimethyl sulfoxide molecules are connected by an N—H...O hydrogen bond.

scholarly journals Crystal structure of (4Z)-4-[(2E)-1-hydroxy-3-(naphthalen-2-yl)prop-2-en-1-ylidene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one

2015 ◽  
Vol 71 (6) ◽  
pp. o381-o381
Author(s):  
Muhammad Salim ◽  
Munawar Ali Munawar ◽  
Muhammad Nawaz Tahir ◽  
Muhammad Shahid ◽  
Khizar Iqbal Malik
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Benzene Ring ◽  
Title Compound ◽  
Pyrazole Ring ◽  
Ring System ◽  
Dihedral Angles ◽  
Stacking Interactions ◽  
Naphthalene Ring ◽  
Compound C

In the title compound, C23H18N2O2, the pyrazole ring subtends dihedral angles of 2.01 (13) and 1.55 (10)° with the pendant benzene ring and the naphthalene ring system, respectively. The molecule is almost planar (r.m.s. deviation for the 27 non-H atoms = 0.025 Å) and intramolecular O—H...O and C—H...O hydrogen bonds both closeS(6) loops. In the crystal, very weak aromatic π–π stacking interactions between the benzene and the pyrazole rings, with centroid–centroid distances of 3.8913 (14) and 3.9285 (15) Å, are observed.

New Condensed Tri- and Tetracyclic Pyrazole Ring System

Heterocycles ◽  
1984 ◽  
Vol 22 (11) ◽  
pp. 2513 ◽  
Author(s):  
Jan Svetlik ◽  
Jan Svetl談
Keyword(s):  
Pyrazole Ring ◽  
Ring System

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.

Sign in / Sign up

Export Citation Format

Share Document