- 6-aryloxyacetic acetoxy orange ketones compound and the application of the pesticides
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The invention relates to a 6-aryloxy acetoxy aurone compound and an application thereof on a pesticide, and belongs to the technical field of herbicides. The general formula of the 6-aryloxy acetoxy aurone compound is as shown in the specification, wherein R1 is hydrogen, halogen, C1-C4 haloalkyl, C1-C4 alkyl, C1-C4 alkoxy and C1-C4 alkylamino, and R2 is the hydrogen and the C1-C4 alkyl. The invention provides a lot of novel chemical structures and novel compounds. A biological activity measurement result indicates that the compound I has very high weeding activity.
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Paragraph 0057; 0058
(2016/12/01)
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- Fenoxanil original drug synthesis method
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The invention relates to a fenoxanil original drug synthesis method. The method includes: employing an organic solvent to synthesize an intermediate 2-(2, 4-dichlorophenoxy)propionic acid by one step, and then synthesizing fenoxanil. Therefore, the condensation yield reaches more than 96%. The method provided by the invention can substantially reduce wastewater and realize clean production, and has very good practical application effect.
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Paragraph 0007-0009
(2018/02/04)
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- Study of hydrogen bonding in N'-(4,6-disubstituted-pyrimidin-2-yl)-N-[2-(2, 4-dichlorophenoxypropionyl)]thiourea
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Two of N'-N'-(4,6-disubstituted-pyrimidin-2-yl)- N-[2-(2,4- dichlorophenoxypropionyl)]thiourea (4a-4b) had been synthesized and their crystal structures had been determined by X-ray diffraction method. 4a crystallizes in the triclinic space group P-1, wit
- Liu, Guo-Hua,Sun, Chuan-Shou,Xue, Yun-Ning,Yao, Mei,Yu, Han
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scheme or table
p. 675 - 680
(2011/04/23)
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- Facile one-pot reaction for the regioselective syntheses of 2H-[1,2,4]thiadiazolo[2,3-α]pyrimidine derivatives
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A convenient and rapid method for the preparation of 2H-1,2,4-thiadiazole[2,3-a]pyrimidine derivatives 3a-3e was developed. The investigations of their regioselective syntheses through a comparison of the different substituted groups on the pyrimidine rin
- Liu, Guohua,Yao, Mei,Xue, Yunning,Fang, Haibin,Cao, Xiaowei
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p. 655 - 660
(2008/09/20)
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- Process for the preparation of meso-zeaxanthin
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A process for the preparation of optically pure acetylenediols of the formulae R-I and S-I and their further reaction to give meso-zeaxanthin are described.
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- Synthesis of N- 2-pyrrolidinone as antimicrobial agent
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Several N- 2-pyrrolidinones have been synthesised and screened for their antibacterial and antifungal activities. their structures have been elucidated on the basis of elemental analysis and spectral data.
- Bhatt, P.,Srivastava, S. D.,Mehta, P.
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p. 514 - 516
(2007/10/03)
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- (R)- and (S)-3-hydroxy-4,4-dimethyl-1-phenyl-2-pyrrolidinone as chiral auxiliaries in the enantioselective preparation of α-aryloxypropanoic acid herbicides and α-chlorocarboxylic acids
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rac-α-Chlorocarboxylic acids, rac-9a-e, were formally deracemized by reaction of the corresponding acyl chlorides with the chiral auxiliaries (R)- and (S)-3-hydroxy-4,4-dimethyl-1-phenyl-2-pyrrolidinone, (R)- and (S)-4, followed by mild alkaline hydrolysis. The highest o.p. (99%) was obtained in the case of (S)-α-chloropropanoic acid, a known precursor for the synthesis of (R)-α-aryloxypropanoic acid herbicides such as dichlorprop-P, (R)-3a, or mecoprop-P, (R)-3b, which, together with their enantiomers, were also obtained in moderate e.e.s by dynamic kinetic resolution from (αRS,3S)-4,4- dimethyl-2-oxo-l-phenylpyrrolidin-3-yl α-bromopropanoate, (αRS,3S)-6, by reaction with the corresponding phenoxide followed by mild acid hydrolysis.
- Camps, Pelayo,Perez, Francesc,Soldevilla, Nuria
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p. 2065 - 2079
(2007/10/03)
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- Dynamic enzymatic resolution of thioesters
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A detailed investigation of several issues related to the enzymatic resolution of thioesters under conditions of continuous racemization of substrate was conducted. The kinetic acidity of the α-protons of a series of α-substituted propionate thioesters was studied. It was found that the rate of α-proton exchange could be enhanced as much as 20-fold by variation of the thiol moiety, increasing the range of compounds to which enzymatic dynamic resolution may be applied. The relative rates of hydrolysis of ethyl butyrate and ethyl thiobutyrate by several enzymes commonly used in enzymatic resolution were determined. All of the enzymes studied exhibited similar rates of thioester and oxoester hydrolysis except for the esterase from pig liver, which showed very low activity in thioester hydrolysis. Dynamic resolution of the propargyl and trifluoroethyl thioesters of α- phenylpropionate was conducted using subtilisin Carlsberg as a catalyst. These examples demonstrated that enzymatic dynamic resolution can be applied even when the rate of α-proton exchange and the enantioselectivity of the enzyme are fairly low. A dynamic enzymatic transesterification procedure was demonstrated in the resolution of the trifluoroethyl thioester of α-(2,4- dichlorophenoxy)propionate, and product was obtained in 93% ee. This work helps expand and define the scope of enzymatic dynamic resolution of thioesters.
- Um, Pil-Je,Drueckhammer, Dale G.
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p. 5605 - 5610
(2007/10/03)
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