Isoxazol-5(4H)-ones. X-Ray crystal structures of a 4-hydroxyisoxazol-5(4H)-one and a [4,4′-biisoxazole]-5(4H),5′(4′H)-dione formed by oxygen oxidation of 3-tert-butyl-4-methylisoxazol-5(4H)-one
作者:Lotte Brehm、Jørgen S. Johansen、Povl Krogsgaard-Larsen
DOI:10.1039/p19920002059
日期:——
(2H)-one 6 and (RS)-3-tert-butyl-4-methylisoxazol-5(4H)-one 7. During the attempts to crystallize the inseparable mixture of tautomers 6 and 7 two other compounds, (RS)-3-tert-butyl-4-hydroxy-4-methylisoxazol-5(4H)-one 8 and (RS,RS)-3,3′-di-tert-butyl-4,4′-dimethyl-[4,4′-biisoxazole]-5(4H), 5′(4H)-dione 9, were progressively formed. The structures of compounds 8 and 9 were established by X-ray analyses
乙基的处理(RS)-2,4,4-三甲基-3-氧代戊酸酯4在碱性条件下的羟胺,得到5-叔丁基-4-甲基异恶唑-3-醇5和3-互变异构体混合物叔丁基- 4-甲基异恶唑-5(2 H)-one 6和(RS)-3-叔丁基-4-甲基异恶唑-5(4 H)-one 7。在尝试使互变异构体6和7的不可分离的混合物结晶的过程中,出现了另外两种化合物((RS)-3-叔丁基-4-羟基-4-甲基异恶唑-5(4 H)-8和(RS,RS)-3,3'-二叔丁基-4,4'-二甲基-[4,4'-联异唑] -5(4 H),5'(4 H)-二酮9,逐渐形成。通过X射线分析确定化合物8和9的结构。提出化合物8和9是通过用氧气氧化化合物7而形成的,但是这两个氧化过程的机理尚不清楚。