Ultrapure 4-methylpyrazole

Details Ultrapure 4-methylpyrazole Ultrapure 4-methylpyrazole

2006-04-13

2009-06-30

Shiao, Rei-Tsang (Department: 1626)

Drug, bio-affecting and body treating compositions

Designated organic active ingredient containing

Having -c-, wherein x is chalcogen, bonded directly to...

C548S356100

Reexamination Certificate

active

07553863

ABSTRACT:
Disclosed is an ultrapure 4-methylpyrazole containing less than 0.1% pyrazole and containing less than 10 ppm each of hydrazine and nitrobenzaldehyde. The ultrapure 4-methylpyrazole is prepared by a novel process so that less than 0.01% of ethylvinyl ether is present.

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