1. Pyrazoles
2. A. Lévai, Khim. Geterotsikl. Soedin., 747 (1997).
3. Synthesis of 2-pyrazolines by the reactions of α,β-unsaturated aldehydes, ketones, and esters with diazoalkanes, nitrile imines, and hydrazines
4. R. E. Brown and J. Shavrel, Jr., US Patent 3,624,102 (1972);
5. Chem. Abstr., 76, 59618 (1972).