Studies on the Derivatives of Biphenylene Oxide. VII. The Influence of Substitution on the Opening and Closing of the Furan-ring of Biphenylene Oxide
作者:Seishi Yamashiro
DOI:10.1246/bcsj.17.10
日期:1942.1
removal of acetyl groups of those compounds and also the formation of the furan-ring. This facilitating effect varies with the relative position of the nitro group and the acetoxyl group, the order of the effect being ortho>para>meta; but the m-nitrosubstitution induces no ring-formation, giving exclusively nitrobiphenols. (ii) The introduction of bromine into the diacetoxydiphenyls hinders the removal
(1) 比较了邻',邻'-双酚及其硝基、溴硝基和溴代衍生物的取代对呋喃环形成的影响,以钡的干燥碳酸盐反应得到以下结果或钠和衍生自这些双酚的二乙酰氧基二苯基。(i) 将硝基引入二乙酰氧基二苯基有利于去除这些化合物的乙酰基以及形成呋喃环。这种促进作用随着硝基和乙酰氧基的相对位置而变化,作用顺序为邻>对>间;但间硝基取代不诱导成环,仅产生硝基双酚。(ii) 将溴引入二乙酰氧基二苯基会阻碍乙酰基的去除以及呋喃环的形成,没有得到溴化联苯醚。相对于乙酰氧基,这种效果在 o-取代的情况下比在 p-one 的情况下更显着......