TABLE 1.

Optimization of molar ratio of choline chloride:urea and reaction temperature in synthesis of pyrazole.

Entry	Product	Molar ratio of choline chloride:urea	Reaction temperature (°C)	Tim (min)	Yield (%)
1	4a	0: 1	80	60	N.R
2	4a	1: 0	80	60	N.R
3	4a	1: 1	80	60	67
4	4a	1: 2	80	20	97
5	4a	1: 3	80	30	82
6	4a	1: 4	80	30	55
7	4a	1: 2	50	30	52
8	4a	1: 2	60	30	76
9	4a	1: 2	70	30	88
10	4a	1: 2	90	30	95
11	4a	1: 2	100	30	90

N.R, no reaction.