Category: 1126-00-7

Synthetic Route of 1126-00-7, The chemical industry reduces the impact on the environment during synthesis 1126-00-7, name is 1-Phenylpyrazole, I believe this compound will play a more active role in future production and life.

EXAMPLE 29A 4-Bromo-1-phenyl-1H-pyrazole To 1-phenylpyrazole (Aldrich, 1 g, 6.94 mmol) in 10 mL acetic acid was added 1.1 g of Br2 (Fisher, 6.94 mmol) in 10 mL acetic acid. This mixture was warmed to 100 C. in a pressure tube for 8 h. The material was cooled to ambient temperature, poured into ice and H2O in a 500 mL beaker and excess saturated, aqueous NaHCO3 was added until all the acetic acid had been quenched. EtOAc (50 mL) was added and the layers were separated. The aqueous layer was extracted 2*15 mL EtOAc and the combined organics were dried over Na2SO4 and concentrated under reduced pressure to give a crude solid. Purification via flash column chromatography (SiO2, 50% hexanes-EtOAc) gave 1.5 g of the title compound (6.72 mmol, 97% yield). MS (DCI/NH3) m/z 223, 225 (M+H)+.

In the field of chemistry, the synthetic routes of compounds are constantly being developed and updated. I will also mention this compound in other articles, 1-Phenylpyrazole, other downstream synthetic routes, hurry up and to see.

Synthetic Route of 1126-00-7, As we all know, there are many different methods for the synthesis of a compound, and people can choose the synthesis method that suits their own laboratory according to the actual situation. 1126-00-7 name is 1-Phenylpyrazole, This compound is widely used in many fields, so it is necessary to find a new synthetic route. The downstream synthesis method of this compound is introduced below.

A solution of 1-phenylpyrazole (2.0g, 13.87 mmoles) in TFA (l7mL) was stirred under a nitrogen atmosphere and treated with. hexamethylene tetramine (2.92 g, 20.81 mmoles). The reaction was refluxed overnight, and then cooled and poured into saturated sodium bicarbonate aqueous solution to adjust the pH to 7. The aqueous phase was extracted three times with ethyl acetate. The combined organic phases were washed with brine, dried overMgSO4, filtered and concentrated to 2.78 g of crude oil. Flash column chromatography on silica gel with a 40 gram Isco MPLC column using 10-20% EtOAc-Hexanes gradient provided 0.72 g of the title compound.1H NMR oe 9.98 (s, 1H), 8.44(s, 1H), 8.17 (s, 1H), 7.70 (m, 2H), 7.5 (m,2H), 7.4 (m,1H).

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 1-Phenylpyrazole, and friends who are interested can also refer to it.

Application of 1126-00-7, Each compound has different characteristics, and only by selecting the characteristics of the compound suitable for a specific situation can the compound be applied on a large scale. 1126-00-7, name is 1-Phenylpyrazole, This compound has unique chemical properties. The synthetic route is as follows.

Example A: 1-Phenylpyrazole-5-carbaldehyd; Experimental procedure:; Under N2-atmosphere a solution of n-butyllithium in heptane (2.61 M, 5.3 mL, 13.9 mmol) is slowly added to a cooled (- 78 C) solution of 1-phenyl-1H-pyrazole (2.0 g, 13.9 mmol) in abs. THF (60 mL). The reaction mixture was stirred for 2 h at -78 C. Subsequently a Solution of abs. DMF (1.1 mL, 13.9 mmol) in abs. THF (8 mL) is slowly added at -78 C. This mixture was stirred for 1 h at -78 C, before it was slowly heated to room temperature and was stirred for a further 18 h. Then it was hydrolysed with water (10 mL) and subsequently extracted three times with CH2Cl2. The organic phases were dried (Na2SO4), filtered and the solvent was removed under vacuum. The crude product (2.48 g) was purified using flash-chromatography (?= 6 cm, h = 12 cm, n-hexane:ethylacetate = 8:2, 30 mL, Rf = 0.24). Yellow Oil, that crystalized in the cold to a yellow solid, melting point: 31 C, Yield: 2.15 g (90%) C10H8N2O (172.2) MS (EI): m/z (rel.Int) = 172 [M+, 100], 144 [M – CO, 69]. IR (neat): nu (cm-1) = 3063 (C-H aromat.), 2923 (C-H aliphat.), 2854 (C-H), 1683 (C=O), 1596, 1517, 1499 (C=C), 763, 694 (C-H). 1H-NMR (CDCl3): delta (ppm) = 7.11 (d, J = 2.1 Hz, 1H, Pyrazole-4-CH), 7.46 – 7.56 (m, 5H, Phenyl-CH), 7.76 (d, J = 2.0 Hz, 1H, Pyrazole-3-CH), 9.88 (s, 1 H, CHO). 13C-NMR (CDCl3): delta (ppm) = 112.5 (1 C, Pyrazole-4-CH), 125.8 (2 C, Phenyl-CH, ortho), 129.4 (1 C, Phenyl-CH, para), 129.6 (2 C, Phenyl-CH, meta), 139.0 (1 C, Phenyl-C, quartaer), 140.3 (1 C, Pyrazole-5-C), 140.7 (1 C, Pyrazole-3-CH), 180.2 (1 C, CHO).

The chemical industry reduces the impact on the environment during synthesis 1-Phenylpyrazole. I believe this compound will play a more active role in future production and life.