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- The synthetic method of perfume 2 - methyl - 3 - methoxy pyrazine was investigated and better reaction conditions have been found. 利用相转移催化法合成香料2-甲基-3甲氧基吡嗪,并对其反应条件进行探讨,找到较佳的反应条件。
- methoxy pyrazine 甲氧基吡嗪
- Methoxy 1 groups are split off with boiling HI and converted to ?? 甲氧基用沸腾的碘氢酸分解,使甲氧基脱落并转为甲基碘。
- An equatorial methoxy group was completely inert to the Grignard reagent. 位于平伏键的甲氧基,则没有这种可能,因而不发生反应。
- R" is a replaceable function, e. g. acetoxy, methoxy, their acyloxy and alkoxy homologs or halo. R”是取化基,如乙氧基、甲氧基及它们的环氧和烷氧同系物或卤基。
- R " is a replaceable function, e. g. acetoxy, methoxy, their acyloxy and alkoxy homologs or halo. 是取化基,如乙氧基、甲氧基及它们的环氧和烷氧同系物或卤基。
- The electric effects of methoxy in ortho-position differ from that in meso-position. 甲氧基处于氨基的邻位的电子效应和处于间位时不同。
- OBJECTIVE To study the protective effect of tetramethyl pyrazine (TMP) on cyclophosphamide injured mice. 目的:考察川芎嗪对小鼠环磷酰胺损伤的保护作用。
- Methoxy polyethylene glycol(MPEG), which grafted with cellulose diacetate(CDA), was applied as a modifier. 采用聚乙二醇单甲醚(MPEG)作为改性剂,与二醋酸纤维素(CDA)进行接枝反应。
- In conclusion, the methoxy in benzene is the very key factor of affinity for the D2 receptor. 推断苯环上R6位甲氧基对苯酰胺类化合物与多巴胺D2受体亲合性起关键性作用。
- However, related data show that besides Maillard reaction, the microbial metabolic pathway, the protein and amino acids healing processes can also produce pyrazine compounds. 但据有关资料表明,除了“美拉德反应途径”外还有“微生物代谢产物途径、蛋白质加热分解途径和氨基酸类的加热分解途径”也可以产生吡嗪类化合物。
- This article deals with the synthesis of 3 methoxy 4 hydromandelic acid by condensation of guaiacol and glyoxalic acid in akaline condition. 本文研究了在碱性条件下,由愈创木酚和乙醛酸合成3-甲氧基-4-羟基扁桃酸的反应。
- The ether soluble compounds of the reaction product were analyzed by GC/MS.The major iden tified compounds were pyrazine and furan compounds. 该反应产物的醚溶性成分经GC/MS分析显示,其主要成分为吡嗪类和呋喃类化合物。
- This article uses the single methoxy polyethylene glycol (mPEG) to ox blood Cu/Zn-SOD modified, and to compare the SOD nature and modified. 本文采用单甲氧基聚乙二醇(mPEG)对牛血Cu/Zn-SOD进行了化学修饰,并对修饰前后SOD的性质进行了比较。
- The results showed that there existed typical Maillard reaction product including pyrazine, thiazole, sulfur-containing compounds and so on. 结果分析表明,反应液存在典型的美拉德反应产物如吡嗪、噻唑、含硫化合物等。
- The variety and high content of pyrazine compounds in Maotai-flavor liquor are regarded as the products of Maillard reaction so far. 摘要迄今为止,普遍认为酱香型白酒中种类众多、含量很高的吡嗪类化合物是通过美拉德反应途径产生的。
- Furthermore, self-assembly of citric acid with Co, Ni, Cu or Zn has been conducted with pyrazine acting as base and/or the second ligand. 在考虑到乙酸根在以上一些合成实例中的重要作用后,我们采用了乙酰丙酮原位分解生成乙酸根的反应,以期螯合稀土金属离子的部分配位点,减小稀土有机多羧酸结构的交联度。
- The effect of the solvent on bromination of 6 methoxy 2 acyl naphthalene and 2 methoxyl naphthalene with 1,3 dibromo 5,5 dimethyl hydantoin was studied. 考察了在不同极性溶剂中以 1 ,3 二溴 5,5 二甲基海因作溴化剂对溴化 6 甲氧基 2 酰基萘反应的影响。
- The extractable quantity is related to the time ofhydrolysis and thd ester-value of the linseed gum and the content of methoxy is relatedto the temperature of the extracting. 该胶可用水、碱、酸提取,提取量与水解温度和时间有关,胶的酯化度和甲氧基含量与提取温度有关。
- In the first part of this paper, three new ligands with bis(8-hydroxyquinoline) which were substituted by methoxy, butoxy and octoxy were synthesized by Witting-Horner reaction. 自从1987年C.;W