Oxidations by the system “hydrogen peroxide - manganese(IV) complex - acetic acid” — Part II. Hydroperoxidation and hydroxylation of alkanes in acetonitrile
作者:Georgiy B Shul'pin、Georg Süss-Fink、John R Lindsay Smith
DOI:10.1016/s0040-4020(99)00233-1
日期:1999.4
ethane, propane, normal butane and isobutane) can be also easily oxidized by the same reagent in acetonitrile solution, the conditions being very mild: low pressure (1–7 bar of the alkane) and low temperature (−22 to +27 °C). Catalyst turnover numbers attain 3100, the yield of oxygenated products is 22% based on the alkane. The yields of oxygenates are higher at low temperatures. The ratio of products
高级烷烃(环己烷,正戊烷,正庚烷,甲基丁烷,2-和3-甲基戊烷,3-甲基己烷,顺式和反式十氢化萘)在20°C下在空气中于乙腈中被H 2 O 2氧化(或(IV)锰盐[L 2 Mn 2 O 3 ](PF 6)2存在下(L = 1,4,7-三甲基-1,4-7-三氮杂环壬烷)作为催化剂。反应混合物的必需组分是乙酸。2小时后的营业额达到3300,基于烷烃的氧化产物收率为46%。氧化最初提供相应的烷基氢过氧化物作为主要产物,但是随后这些化合物分解产生相应的酮和醇。反应的区域和键选择性很高:C(1):C(2):C(3):C(4)≈1:40:35:35和1°:2°:3°是1: (15–40):(180–300)。与十氢化萘的两种异构体反应,得到(用PPh 3处理后)在叔位羟基化的醇,如果是顺式,则顺式/反式比为〜2-十氢化萘,如果是反式十氢化萘,则约为30 (即在后者的情况下,反应是立体特异性的)。轻链烷