3-Methylbenzothiazolin-2-one Hydrazone Hydrochloride

3-Methylbenzothiazolin-2-one Hydrazone Hydrochloride C₈H₉N₃S,HCl,H₂O = 233.7 (149022-15-1)

General reagent grade of commerce.

Melting point, about 270°.

When used for the determination of aldehydes, complies with the following test.

Suitability for the determination of aldehydes To 2 mL of aldehyde-free methanol add 60 µL of a 0.1% w/v solution of propionaldehyde in aldehyde-free methanol and 5 mL of a 0.4% w/v solution of the reagent being examined, mix and allow to stand for 30 minutes. Add 25 mL of a 0.2% w/v solution of iron(iii) chloride hexahydrate, dilute to 100 mL with acetone and mix. The absorbance of the resulting solution at 660 nm is not less than 0.62, Appendix II B. Use in the reference cell a solution prepared at the same time and in the same manner but without the propionaldehyde solution.