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- One of the hydrogen atoms of the active methylene group is replaced with a cyclooxy group. 活性亚甲基上的一个氢原子是被环氧基所取代的。
- Carbasugars,carbocyclic analogues of true sugars,are compounds in which the ring-oxygen of furanoid or pyranoid sugars is replaced by methylene group. 碳环糖是一类呋喃或吡喃糖环中的氧原子被亚甲基取代后形成的糖类似物。
- This paper reports the function of anhydrous potassium fluoride and acetonitrile in C-alkylation of active methylene group of acetoacetic ester. 无水氟化钾和乙腈在乙酰乙酸乙酯活泼亚甲基的C-烃基化中的作用。
- Carbasugars, carbocyclic analogues of true sugars, are compounds in which the ring-oxygen of furanoid or pyranoid sugars is replaced by methylene group. 摘要碳环糖是一类呋喃或吡喃糖环中的氧原子被亚甲基取代后形成的糖类似物。
- A large number of structures of benzene methyl and methylene groups but rare aralkyl ether linkage existed in the waste liquor. 两种废液木素中都含有大量的苯环及甲基、亚甲基结构，几乎不存在烷基芳基醚键结构；
- Substitution position of methylene group 热处理
- Carbasugars, carbocyclic analogues of true sugars, are compounds in which the ring-oxygen of furanoid or pyranoid sugars is replaced by methylene groupe. 碳环糖是一类呋喃或吡喃糖环中的氧原子被亚甲基取代后形成的糖类似物。
- Its long molecules, consisting of tens and hundreds of thousands of methylene groups (!CH2!), cannot exist as long stretched polymeric chains, which might be called a “primary structure. 它是一个大分子的化合物，是由数万数千万的二次甲基（-CH2-）组成的，不能长期以高分子链的延伸存在，这可以称之为“基本结构”。
- Phase transfer catalyzed alkylation of active methylene group 相转移催化活泼亚甲基的烃基化
- Keywords NMR spectra;chemical shifts;nitramine;methylene group; 核磁共振波谱法;化学位移;硝胺;亚甲基;
- Education should not be restricted to any one specific age group. 教育不应限制在任何特定的年龄组上。
- He broke away from that lawless group years ago. 他在几年前脱离了那个非法团体。
- The group of barbaric soldiers killed many people. 那群野蛮的士兵杀了很多人。
- The group was made up of doctors. 这个团体是由医生组成的。
- A group of boys dashed out of the classroom. 一群男孩子从教室里冲出来。
- I come upon a group of children play in the street. 我遇到一群孩子在街上玩耍。
- He goes about with a group of nice boys. 他经常和一群好孩子在一起玩。
- He is a the most brisk young man in this group. 他是这个小组中最活跃的年轻人。
- He showed me a photo of a family group. 他给我看一张合家欢的照片。
- The chief accountant of a manufacturing group. 一个制造业集团的总会计师。
