Adding a certain compound to certain chemical reactions, such as: 930-36-9, name is 1-Methylpyrazole, belongs to pyrazoles-derivatives compound, can increase the reaction rate and produce products with better performance than those obtained under traditional synthetic methods. Here is a downstream synthesis route of the compound 930-36-9, Computed Properties of C4H6N2
Two identical reactions were carried out in parallel.To a mixture of 1 -methylpyrazole (750 g, 9.16 mol) and acetic anhydride (1.7 kg, 16.67 mol) was added concentrated H2S04 (75 g, 0.75 mol) at about 20 C. The reaction mixture was heated at about 150 C. for about 3 hrs. After cooling, the two mixtures were combined, poured into ice-water (15 L), adjusted to about pH 10 with 20% aq. NaOH and extracted with DCM (4×10 L). The combined DCM extracts were dried (Na2SO4) and concentrated to afford the title compound as a brown oil (1240 g, 72%).?H NMR (400 MHz, CDCl3) delta: 7.86 (s, 1H), 7.84 (s, 1H), 3.92 (s, 3H), 2.40 (s, 3H).GCMS mlz=109.0 [M-CH3]+
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Reference:
Patent; Pfizer Inc.; BROWN, Matthew Frank; DERMENCI, Alpay; FENSOME, Andrew; GERSTENBERGER, Brian Stephen; HAYWARD, Matthew Merrill; OWEN, Dafydd Rhys; WRIGHT, Stephen Wayne; XING, Li Huang; YANG, Xiaojing; (67 pag.)US2017/240552; (2017); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics