| 查看: 516 | 回复: 0 | ||
[求助]
求翻译，求翻译！求翻译！
|
|
1 Introduction The allylic oxidation of olefin into a, b-unsaturated alco-hols and ketone is an important transformation in natural product synthesis [1]. In particular, the oxidation products of cyclohexene (CHE) and their derivatives, viz. 2-cyclo-hexene-1-one (2-CHON), 1-metylcyclohex-1-en-3-one, etc., are important in organic synthesis owing to the pres-ence of a highly reactive carbonyl group, which is utilized in cycloaddition reaction [2]. Moreover, the products of allylic oxidation of CHE are important intermediates for the synthesis of medication, pesticide, and insect phero-mone [3]. Whitomore et al. synthesized 2-CHON by the oxidation of CHE using chromic anhydride as oxidation in acetic acid solution [4]. However, the separation of reac-tants and products from the reaction mixture was difficult and the yields were low by using this method. The process may also cause severe environmental pollution. Several homogenous and heterogeneous contained manganese, copper, iridium, iron and cobalt complexes catalysts were employed in the allylic oxidation of CHE [5–11]. But most of the cited work suffered from the drawback more or less. For example, the conversion was low and some reactions need organic solvents and special oxidants, such as, tert-butylhydroperoxide, and chloroperoxybenzoic. Some reactions were carried out using molecular oxygen as oxidant at high pressure. Particularly, some homogeneous medium has several disadvantages owing to the typical problems of separation of products from the catalyst. Sakthivel et al. overcame the typical drawback of homogeneous catalysis by using chromium containing mesoporous molecular sieves as catalyst for the oxidation of CHE to 2-CHON [12]. However, the conversion of CHE was also low and peroxide was used as oxidant. Interest-ingly, Sridhar and co-workers studied the effect of various kinetic parameters on the uncatalyzed oxidation of cyclo-hexene with molecular oxygen [13]. A few resinates, such as calcium, zinc, and manganese resinate, were synthesized and found these kind resinates wide application as dryers for paints and varnishes and as constituents of printing inks. But the catalytic properties of these materials have not been explored so far. Therefore, in this work cobalt resinate was synthesized and used as an efficient catalyst for the oxidation of CHE for the first time. 发自小木虫Android客户端 |
回复此楼» 猜你喜欢
本人最近太闲了，谁有问题可以提，每天会统一回复
已经有9人回复
-
重磅！青年科学基金项目（C类）资助增幅预计超过50%
已经有4人回复
-
青C资助名额大幅增加！
已经有10人回复
-
护理论文 晋升
已经有5人回复
-
求助大佬sci投稿哪个好中
已经有4人回复
-
评审感受-评审感受-评审感受
已经有14人回复
-
这年头没有找到涵评专家，还有中面上的可能吗
已经有6人回复
-
2026博士申请求助
已经有10人回复
-
西南大学考核制博士
已经有6人回复
-
窗边初夏的小雨
已经有10人回复