Reference of 1072-68-0, In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 1072-68-0, name is 1,4-Dimethylpyrazole belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below.
Intermediate 7: 1,4-Dimethyl-1H-pyrazole-5-sulfonyl chlorideA solution of 23% n-butyl lithium in hexane (17.3 mL, 1.2 eq) was added drop-wise to a solution of 1,4-dimethyl-1H-pyrazole (5 g, 1 eq.) in dry ether (50 mL) at -65 C. under a nitrogen atmosphere. The temperature of the resulting suspension was raised to 0 C. temperature over 1 hour and then cooled to -70 C. Excess sulfur dioxide was bubbled to the mixture for 30 minutes, while maintaining the temperature below -65 C. The solution was stirred at -65 C. for 1 hour and was then allowed to warm to room temperature. The resulting precipitate was filtered, washed with ether and dried to yield the lithium sulfinate salt of 1,4-dimethyl-1H-pyrazole. [0570] 1H NMR (400 MHz, DMSO-d6) delta ppm 2.03 (s, 3H) 3.87 (s, 3H) 6.94 (s, 1H)
The synthetic route of 1,4-Dimethylpyrazole has been constantly updated, and we look forward to future research findings.
Reference:
Patent; Carroll, Colm; Goldby, Anne; Teall, Martin; US2013/324576; (2013); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics