17849-38-6Relevant articles and documents
Photoinduced degradation of the herbicide clomazone model reactions for natural and technical systems
David Gara, Pedro M.,Bosio, Gabriela N.,Arce, Valeria B.,Poulsen, Lars,Ogilby, Peter R.,Giudici, Reinaldo,Gonzalez, Monica C.,Martire, Daniel O.
, p. 686 - 692 (2009)
The photodegradation of the herbicide clomazone in the presence of S 2O82- or of humic substances of different origin was investigated. A value of (9.4 ± 0.4) × 108 m-1 s-1 was measured for
Synthesis and reactivity of a hydrido CNC pincer cobalt(III) complex and its application in hydrosilylation of aldehydes and ketones
Zhou, Hongwei,Sun, Hongjian,Zhang, Shumiao,Li, Xiaoyan
, p. 1479 - 1486 (2015)
Reaction of the N-benzylidene-1-naphthylamine with CoMe(PMe3)4 afforded the hydrido CNC pincer cobalt complex CoH(PMe3)2[(C6H4)CH=N(C10H6)] (1) via double C-H bond activation. In the 1H NMR spectrum, a triplet at -18.98 ppm is the typical signal of the hydrido ligand (Co-H). Complex 1 reacted with haloalkane (CH3I and EtBr) to deliver CoX(PMe3)2((C6H4)CH=N(C10H6)) (X = I (2); Br (3)). However, the reactions of complex 1 with HCl and trifluoroacetic acid (TFA) delivered HCoCl(PMe3)2((C6H4)CH=N(C10H7)) (4) and HCo(OCOCF3)(PMe3)2((C6H4)CH=N(C10H7)) (5) with the cleavage of the Co-C(naphthyl) bond. In the 1H NMR spectra, the signals of the hydrido ligands were found at -21.31 (4) and -18.71 (5) ppm. A reaction of complex 1 with DCl was carried out to prove that the hydrogen atom eliminated to the naphthyl carbon comes from HCl. Complex 1 reacted with acetylacetone, resulting in the formation of Co(acac)(PMe3)2((C6H5)CHNH(C10H6)) (7). Complex 1 was found to be an efficient catalyst for hydrosilylation of aldehydes and ketones. The molecular structures of complex 1, 2, 4, and 7 were determined by X-ray single-crystal diffraction.
KINETICS AND MECHANISM OF OXIDATION OF SOME ARYL ALCOHOLS BY ACID BROMATE
Gupta, Kalyan Kali Sen,Kumar, Saroj Chandra,Sen, Pratik Kumar,Banerjee, Amalendu
, p. 2225 - 2232 (1988)
The kinetics of oxidation of some substituted benzyl alcohols as well as the unsubstituted one by bromate ion in hydrochloric acid medium has been suggested.The results indicate that the reaction takes place by way of intermediate ester formation.Methoxy compounds react at much faster rates than the corresponding nitro substituted derivatives.The thermodynamic values associated with the equilibrium step and also for the slow step have been evaluated.A mechanism consistent with the experimental observations has been suggested.
Pt nanoparticles supported on highly dispersed TiO2 coated on SBA-15 as an efficient and recyclable catalyst for liquid-phase hydrogenation
Li, Xiaohong,Zheng, Wenli,Pan, Huiyan,Yu, Yin,Chen, Li,Wu, Peng
, p. 9 - 19 (2013)
A series of TiO2@SBA-15 composites with different TiO 2 loadings have been synthesized through hydrolysis of tetrabutyl orthotitanate via a facile sol-gel method in the presence of SBA-15 mesoporous silica. The TiO2@SBA-15 composites retain the mesostructure of the SBA-15 host, and TiO2 is highly dispersed and uniformly coated. The TiO2@SBA-15 composites serve as remarkable supports for Pt nanoparticles, which can be applied efficiently to the liquid-phase hydrogenation of benzaldehyde, its derivatives, and other unsaturated compounds under mild conditions. Of particular note is that the Pt/TiO2@SBA-15 catalysts can be reused several times without distinct loss in activity or selectivity. The more electron-deficient surface state, together with the structural and physicochemical features of Pt/TiO2@SBA-15 catalysts, would improve the catalytic activity and reusability toward the liquid-phase hydrogenation of unsaturated compounds.
Synthesis and biological evaluation of nigranoic acid esters as novel human neutrophil elastase inhibitors
Huang, Guoli,Feng, Li,Liu, Bo,He, Yi,Li, Yiming,Chen, Yegao
, p. 1650 - 1656 (2015)
Human neutrophil elastase (HNE) has been implicated as a major contributor in the pathogenesis of diseases, such as lung disorders and other inflammatory diseases. A series of 12 new nigranoic acid esters were regioselectively synthesised in good yields and evaluated for HNE inhibitory activity. Nigranoic acid exhibited significant inhibitory activity against HNE with the IC50 value of 3.77 M, and six esters displayed considerable inhibitory effects on HNE with IC50 values in the range of 2.61-8.95 M. The nigranoic acid esters having phenyls substituted with bromine and trimethoxyls (3h and 3b) showed stronger inhibitory activity on HNE than nigranoic acid.
An efficient method for the cleavage of tert-butyldiphenylsilyl ethers catalyzed by 1,3-dibromo-5,5-dimethylhydantoin
Han, Zong
, p. 51 - 62 (2022/02/14)
An efficient method for the deprotection of tert-butyldiphenylsilyl (TBDPS) ethers using 1,3-dibromo-5,5-dimethylhydantoin (DBH) as catalyst and dimethyl sulfoxide (DMSO) as solvent has been established. This method is useful for many kinds of compounds,
Synthesis and catalytic activity of N-heterocyclic silylene (NHSi) iron (II) hydride for hydrosilylation of aldehydes and ketones
Du, Xinyu,Qi, Xinghao,Li, Kai,Li, Xiaoyan,Sun, Hongjian,Fuhr, Olaf,Fenske, Dieter
, (2021/05/29)
A novel silylene supported iron hydride [Si, C]FeH (PMe3)3 (1) was synthesized by C (sp3)-H bond activation with zero-valent iron complex Fe (PMe3)4. Complex 1 was fully characterized by spectroscopic methods and single crystal X-ray diffraction analysis. To the best of our knowledge, 1 is the first example of silylene-based hydrido chelate iron complex produced through activation of the C (sp3)?H bond. It was found that complex 1 exhibited excellent catalytic activity for hydrosilylation of aldehydes and ketones. The catalytic system showed good tolerance and catalytic activity for the substrates with different functional groups on the benzene ring. It is worth mentioning that, the experimental results showed that both ketones and aldehydes could be reduced in good to excellent yields under the same catalytic conditions. Based on the experiments and literature reports, a possible catalytic mechanism was proposed.
