Methylhydrazine → 2-Methyl-2-[(4-chlorophenyl)sulfonyl] hydrazine

Into a 100 mL three necked round bottom flask equipped with a mechanical stirrer, thermometer, and dropping funnel under an atmosphere of nitrogen was added THF (25 mL), methylhydrazine (2.53 g, 2.92 mL, 55 mmol), and triethylamine (4.35 g, 43 mmol). The temperature of the mixture was lowered to approximately 5° C. and crude 4-chlorophenylsulfonyl chloride (10.5 g, 50 mmol, contained 4-chlorophenyl sulfonic acid) dissolved in 25 mL of THF was added dropwise at a rate such that the temperature did not rise over 10° C. The cooling bath was removed and the mixture was allowed to warm to stir overnight at RT. Ether (100 mL was added to the reaction mixture and the resulting slurry was washed with water (50 mL), brine (50 mL), dried (Na2SO4), and the solvent was removed in vacuo to give 5.4 g (49% yield) of 2-methyl-2-[(4-chlorophenyl)sulfonyl] hydrazine. 1H NMR (CDCl3) δ 7.8 (d, 2H), 7.6 (d, 2H), 3.6 (s, b, 2H), 2.9 (s, 3H).

1. customwas lowered to approximately 5° C.
2. additionwas added dropwise at a rate such that the temperature
3. customdid not rise over 10° C
4. customThe cooling bath was removed
5. temperatureto warm
6. additionEther (100 mL was added to the reaction mixture
7. washthe resulting slurry was washed with water (50 mL), brine (50 mL)
8. dry with materialdried (Na2SO4)
9. customthe solvent was removed in vacuo

ORD record

ord-e2fd0b5ee3884257a8e38de3b6807d0d

Source dataset

uspto-grants-2001_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06262305B1