作者:A. I. Shif、S. N. Lyubchenko、O. Ya. Borbulevych、O. V. Shishkin、K. A. Lyssenko、L. P. Olekhnovich
DOI:10.1007/bf02494416
日期:1999.1
Oxidation of 4,6-di-tert-butylpyrogallol gave two dimeric products instead of the expected 4,6-di-tert-butyl-3-hydroxy-1,2-benzoquinone (2). It was established by X-ray diffraction analysis that the first product has the structure of tetra-tert-butyl-6, 10a-dihydroxy-1,2-dioxo-3,4a,7,9-1,2,4a, 10a-tetrahydrodibenzo-1,4-dioxine. From this it follows that compound 2 undergoes regio- and stereospecific
4,6-二叔丁基焦酚的氧化得到两种二聚产物,而不是预期的 4,6-二叔丁基-3-羟基-1,2-苯醌 (2)。X-射线衍射分析确定第一产物具有四叔丁基-6, 10a-二羟基-1,2-二氧-3,4a,7,9-1,2,4a, 10a的结构-四氢二苯并-1,4-二恶英。由此可知,化合物 2 根据 [2π+4π]-环加成机制,即杂 Diels-Alder 反应进行区域和立体定向二聚化。1 H NMR 光谱中信号的双强度表明第二个产物 2,6,4', 6'-四叔丁基-4,4'-二羟基-3,5,3' 的对称结构,5'-tetraoxo-4,4'-bi(cyclohexene),它是在连苯三酚氧化的中间体(即,其)重组 (r+r orl+l) 后形成的对映异构体的外消旋物,