Three chlorinated nitrosopiperidines, 3-chloro-, 4-chloro-, and 3,4-dichloronitrosopiperidine, were administered to groups of 20 male Fischer 344 rats at a concentration of 0.17 mM in drinking water. Treatment with the monochloro compounds lasted for 30 weeks, while treatment with the dichloro compound lasted for 21 weeks. Almost all of the animals died with esophageal tumors. There was also a ...

In this work 3-chloro-2-chlorocarbonylbenzo[b]thiophene (1) was prepared from cinnamic acid and then converted into the acid hydrazide 2. The azomethines 3a-e were prepared from the corresponding aryl aldehydes and the acid hydrazide 2. Treatment of compound 2 with formic acid gave the N-formyl acid hydrazide 4, which upon refluxing with phosphorous pentoxide or phosphorous pentasulphide in xyl...

In the structure of the title compound (N26DCP2CBA), C(13)H(8)Cl(3)NO, the conformations of N-H and C=O bonds in the amide group are trans to each other, similar to that observed in N-(2,6-dichloro-phen-yl)benzamide, 2-chloro-N-phenyl-benzamide, 2-chloro-N-(2-chloro-phen-yl)benzamide and 2-chloro-N-(2,3-dichloro-phen-yl)benzamide with similar bond parameters. Furthermore, the position of the am...

The conformation of the N-H bond in the structure of the title compound (N3CPBA), C(13)H(10)ClNO, is anti to the meta chloro substituent in the aniline benzene ring, similar to that observed with respect to the ortho chloro substituent in N-(2-chloro-phen-yl)benzamide (N2CPBA) and meta chloro substituent in N-(3,4-dichloro-phen-yl)benzamide (N34DCPBA), but in contrast to the syn conformation ob...

This research evaluates the efficiency of nanosized ZnO in the catalytic ozonation of 4-chloro-2-nitrophenol and determines the effect of pH on heterogeneous catalytic ozonation. The combined use of ozone and ZnO catalyst leads to conversion of 98% 4-chloro-2-nitrophenol during 5 min. In addition, it was found that in ZnO catalytic ozonation, the degradation efficiency of 4-chloro-2-nitrophenol...

The diaminopimelic acid (DAP) analog, 3-chloro-DAP, was synthesized and tested as the racemic acid for antibacterial activity and for inhibition of DAP epimerase. 3-Chloro-DAP was a potent inhibitor of DAP epimerase purified from Escherichia coli (Ki = 200 nM), and it is argued that 3-chloro-DAP is converted to a tight-binding transition state analog at the active site of this enzyme. Furthermo...

Biochemical investigations relating to the mechanism of action and mechanism of activation have been made for the carcinogen, 4-chloro-2-methylaniline. Radioactivity from 4-chloro-2-[methyl-14C]methylaniline became extensively bound to protein, DNA, and RNA of rat liver, but macromolecules of some of the other tissues examined contained little radioactivity. Enzymatic activity dependent upon re...

In the title compound, C21H13Cl2NO2S, the benzo-thia-zole ring makes dihedral angles of 0.94 (1) and 70.65 (5)° with the 4-chloro-phenyl-methanone unit and the 5-chloro-phenyl ring, respectively. The dihedral angle between the 4-chloro-phenyl-methanone unit and the 5-chloro-phenyl ring is 66.20 (5)°. The crystal structure consists of dimeric units generated by C-H⋯N hydrogen bonds, further link...

The conformation of the N-H bond in the structure of the title compound, C(10)H(12)ClNO, is syn to the ortho methyl group, similar to that observed with respect to the meta methyl group in 2-chloro-N-(3-methyl-phen-yl)acetamide and the ortho-chloro group in 2-chloro-N-(2-chloro-phen-yl)acetamide. The geometric parameters are similar to those of other acetanilides. The mol-ecules are linked into...

To synthesize 4-chloro-5-methoxy-2-(b-trifluoroethyl)-3(2H)-pyridazinone (4), the reactions of 4-chloro-5-methoxy-3(2H)-pyridazinone (5) with RCH(2)CF(3)(R = I, TsO, MsO, TfO) in different solvents were studied. It was found that methyl group migration took place during this reaction. An oxonium salt 9 was suggested as the active intermediate for the formation of the byproduct 4-chloro-5-methox...