NOMENCLATURE

Common name hymexazol (BSI, E-ISO, (m) F-ISO); hydroxyisoxazole (JMAF)

IUPAC name 5-methylisoxazol-3-ol 

Chemical Abstracts name 5-methyl-3(2H)-isoxazolone (C.A. preferred tautomer) 

CAS RN [10004-44-1]  EEC no. 233-000-6  Development codes F-319; SF-6505 (both Sankyo) 

PHYSICAL CHEMISTRY

Composition Tech. is 99% pure.  Mol. wt. 99.1  M.f. C₄H₅NO₂  Form Tech. forms colourless crystals.  M.p. 86-87 ºC  B.p. 202? ºC  V.p. 182 mPa (25 ºC)  K_OW logP = 0.480 (unstated pH)  Henry