25465-65-0

Dissolve it in Et2O, dry over MgSO4, filter, evaporate, then recrystallise it from pet ether. Also recrystallise it from aqueous EtOH and distil it in a vacuum. [Kergomard & Geneix Bull Soc Chim Fr 394 1958, Zweifel & Brown J Am Chem Soc 86 393 1964.] The 3,4-dinitrobenzoyl derivative has m 100-101o, the phenylcarbamoyl derivative has m 137-138o and the acid -phthalate has m 125-126o. [Beilstein 6 III 282, 283.]