| 查看: 525 | 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
生命口C13面上会评时间
已经有11人回复
-
内心匮乏
已经有16人回复
-
生命口面上会评结束了吗大家有知道结果吗？现在还没有结果正常不？
已经有9人回复
-
投英文期刊如何查重
已经有6人回复
-
不要再数国自然申请书的 filecode 的分隔符个数了
已经有21人回复
-
伯胺上甲基求助
已经有7人回复
-
跨出版社商投稿
已经有5人回复
-
5个%2F，非固定段22个字母
已经有7人回复
-
生生命学部会评
已经有4人回复
-
H口，面上，时间戳7月7日。
已经有3人回复