Pesticidal compositions and processes related thereto
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example 1
Preparation of 1-(1-bromo-2,2,2-trifluoroethyl)-3,5-dichlorobenzene (AI1)
[0197]
Step 1 Method A. 1-(3,5-Dichlorophenyl)-2,2,2-trifluoroethanol (AI2)
[0198]To a stirred solution of 1-(3,5-dichlorophenyl)-2,2,2-trifluoroethanone (procured from Rieke Metals, UK; 5.0 grams (g), 20.5 millimoles (mmol)) in methyl alcohol (CH3OH; 100 milliliters (mL)) at 0° C. were added sodium borohydride (NaBH4; 3.33 g, 92.5 mL) and 1 Normal (N) aqueous sodium hydroxide solution (NaOH; 10 mL). The reaction mixture was warmed to 25° C. and stirred for 2 hours (h). After the reaction was deemed complete by thin layer chromatography (TLC), saturated (satd) aqueous (aq) ammonium chloride (NH4Cl) solution was added to the reaction mixture, and the mixture was concentrated under reduced pressure. The residue was diluted with diethyl ether (Et2O) and washed with water (H2O; 3×50 mL). The organic layer was dried over sodium sulfate (Na2SO4) and concentrated under reduced pressure to afford the title compound as a ...
example 2
Preparation of N-methyl-4-vinylbenzamide (AI9)
[0215]
Step 1. 4-Vinylbenzoyl chloride (AI10)
[0216]To a stirred solution of 4-vinylbenzoic acid (1 g, 6.75 mmol) in CH2Cl2 (20 mL) at 0° C. were added a catalytic amount of N,N-dimethylformamide (DMF) and oxalyl chloride (1.27 g, 10.12 mmol) dropwise over a period of 15 minutes (min). The reaction mixture was stirred at 25° C. for 6 h. After the reaction was deemed complete by TLC, the reaction mixture was concentrated under reduced pressure to give the crude acid chloride.
Step 2. N-Methyl-4-vinylbenzamide (AI9)
[0217]To 1 M N-methylamine in THF (13.5 mL, 13.5 mmol) at 0° C. were added triethylamine (Et3N, 1.34 mL, 10.12 mmol) and the acid chloride from Step 1 above in THF (10 mL), and the reaction mixture was stirred at 25° C. for 3 h. After the reaction was deemed complete by TLC, the reaction mixture was quenched with water and then was extracted with EtOAc (3×). The combined EtOAc layer was washed with brine and dried over Na2SO4 and c...
example 3
Preparation of ethyl 2-methyl-4-vinylbenzoate (AI14)
[0225]
Step 1. 4-Formyl-2-methylbenzoic acid (AI15)
[0226]To a stirred solution of 4-bromo-2-methylbenzoic acid (10 g, 46.4 mmol) in dry THF (360 mL) at −78° C. was added n-butyllithium (n-BuLi, 1.6 M solution in hexane; 58.17 mL, 93.0 mmol) and DMF (8 mL). The reaction mixture was stirred at −78° C. for 1 h then was warmed to 25° C. and stirred for 1 h. The reaction mixture was quenched with 1 N HCl solution and extracted with EtOAc. The combined EtOAc extracts were washed with brine and dried over Na2SO4 and concentrated under reduced pressure. The residue was washed with n-hexane to afford the title compound as a solid (3.0 g, 40%): mp 196-198° C.; 1H NMR (400 MHz, DMSO-d6) δ 13.32 (br s, 1H), 10.05 (s, 1H), 7.98 (m, 1H), 7.84 (m, 2H), 2.61 (s, 3H); ESIMS m / z 163.00 ([M+H]−).
Step 2. Ethyl 4-formyl-2-methylbenzoate (AI16)
[0227]To a stirred solution of 4-formyl-2-methylbenzoic acid (3 g, 18.2 mmol) in ethyl alcohol (EtOH; 30 mL) was...
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