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3,5-Dimethylpyrazole is an organic compound with the formula (CH 3 C) 2 CHN 2 H. It is one of several isomeric derivatives of pyrazole that contain two methyl substituents. The compound is unsymmetrical but the corresponding conjugate acid (pyrazolium) and conjugate base (pyrazolide) have C 2v symmetry.
Substituted pyrazoles are prepared by condensation of 1,3-diketones with hydrazine (Knorr-type reactions). [7] For example, acetylacetone and hydrazine gives 3,5-dimethylpyrazole: [8] CH 3 C(O)CH 2 C(O)CH 3 + N 2 H 4 → (CH 3) 2 C 3 HN 2 H + 2 H 2 O. A wide variety of pyrazoles can be made so: [7]
KTp* is synthesized in a manner similar to that of KTp by the reaction of potassium borohydride and 3,5-dimethylpyrazole. Hydrogen gas is evolved as each of the pyrazole reacts at the boron. The rate of B-N bond formation becomes more difficult with each successive 3,5-dimethylpyrazolyl due to the increase in steric hindrance around the boron: [2]
Analogously 3-isopropylpyrazole gives HB(C3N2H2iPr)3]-, abbreviated [Tp iPr] −. 3,5-Dimethylpyrazole gives the hexamethylated ligand [HB(C 3 N 2 HMe 2) 3] −, sometimes called Tp* −. Because pyrazoles are readily prepared from 1,3-diketones, a large number of substituted Tp complexes are possible. Derivatives are known with perfluorinated ...
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Any non-tertiary benzylic alkyl group will be oxidized to a carboxyl group by aqueous potassium permanganate (KMnO 4) or concentrated nitric acid (HNO 3): (ArCHR 2 → ArCOOH). [6] Finally, the complex of chromium trioxide and 3,5-dimethylpyrazole (CrO 3 −dmpyz) will selectively oxidize a benzylic methylene group to a carbonyl: (ArCH 2 R → ...
Tubocurarine 57-94-3 and 57-95-4 Structure is messed up in union file. I can't make sense of it. ... 3,5-Dimethylpyrazole, O-Methylhydroxylamine, Tetraethylammonium ...