共查询到20条相似文献,搜索用时 484 毫秒
1.
The effects of solvent and impurity on the crystal habit of 11α-hydroxy-16α, 17α-epoxyprogesterone (HEP) grown from solution were studied by scanning electron microscope. Long prismatic crystals were produced when HEP was crystallized from pure acetone and N,N-dimethylformamide, while blocky crystals were produced from pure chloroform by cooling crystallization. One kind of isomorphic impurity, 16α, 17α-epoxyprogesterone (EP)was selected to examine its effect on the HEP crystal habit. When the content of EP in the mother liquor is very high (55.45%, solvent free basis), the habit of produced HEP crystals was greatly modified from prismatic to octahedral. The differential scanning calorimetry and X-ray powder diffraction analyses showed that the change of crystal habit was originated from the crystal structure modification. 相似文献
2.
用干柱色谱法将深度氯化对—二甲苯混合产物进行分离,制得3色谱纯α,α,α,α′,α′,α′—六氯—对—二甲苯。用波谱法对分离产物的纯度和结构进行了鉴定 相似文献
3.
本文介绍了用N-溴代丁二酰亚胺进行溴代反应合成α,α,α′,α′,4-五溴邻二甲苯的新方法,并与传统的溴素溴化法进行了比较。‘ 相似文献
4.
5.
6.
研究了 2 氯 4 硝基 α ,α ,α 三氟甲氧基苯 (CNTFMB)的氟化反应 ,考察了溶剂、相转移催化剂聚乙二醇 (PEG60 0 0 )、KF用量等因素对反应的影响。经实验确定了反应的最佳工艺条件为 :n(CNTFMB)∶n(KF) =1 0∶1 4,CNTFMB的质量 (g)与溶剂DMF的体积 (mL)之比为 1∶3,n(PEG60 0 0 )∶n (CNTFMB) =0 5∶10 0 0 ,反应温度 135℃。在此条件下 ,2 氟 4 硝基 α ,α ,α 三氟甲氧基苯 (FNTFMB)的收率为 85 % ,产品纯度w (FNTFMB) =95 %。 相似文献
7.
8.
α-萘甲醛的合成研究 总被引:3,自引:0,他引:3
报导了以萘作原料 ,通过氯甲基化得α 氯甲基萘 ,再与乌洛托品成盐、水解得α 萘甲醛的合成工艺。采用相转移催化技术 ,使α 氯甲基萘收率提高 ,原料甲醛、盐酸用量减少 ;采用正交实验 ,找到了合成α 萘甲醛较优化反应条件 相似文献
9.
通过运用DTA,XRD,SEM,BET等分析方法,研究不同Na2O含量对氢氧化铝煅烧过程中所生成的不同物相组成、α相含量、晶粒大小及其形貌等方面的影响,对α-Al2O3的生产具有重要的指导意义。 相似文献
10.
[目的]研究抗痴呆药α-吡咯烷酮乙酰胺的合成路线及工艺。[方法]以α-吡咯烷酮乙酸乙酯为起始原料,在乙醇溶液中经氨化反应得α-吡咯烷酮乙酰胺,总收率87.1%。[结果]合成了目标化合物,其化学结构经元素分析、IR得以确证。[结论]该合成路线及工艺适合工业化大生产。 相似文献
11.
The effects of solvent and impurity on the crystal habit of 11α-hydroxy-16α, 17α-epoxyprogesterone (HEP) grown from solution were studied by scanning electron microscope. Long prismatic crystals were produced when HEP was crystallized from pure acetone and N,N-dimethylformamide, while blocky crystals were produced from pure chloroform by cooling crystallization. One kind of isomorphic impurity, 16α, 17α-epoxyprogesterone (EP) was selected to examine its effect on the HEP crystal habit. When the content of EP in the mother liquor is very high (55.45%, solvent free basis), the habit of produced HEP crystals was greatly modified from prismatic to octahedral. The differential scanning calorimetry and X-ray powder diffraction analyses showed that the change of crystal habit was originated from the crystal structure modification. 相似文献
12.
13.
α—萘乙酸及其甲酯是应用广泛的植物生长调节剂,可以促进作物生长,抑制马铃薯萌芽等。以及介绍萘乙酸及其甲酯的性质、合成方法及应用。 相似文献
14.
15.
16.
以α,α′-二溴代己二酸二乙酯为原料,经Gabriel、水解和Mannnich 3步反应,合成出α,α′-二氨基己二酸-N,N,N′,N′-四亚甲基膦酸,产物的总收率30.6%。用13CNMR1、HNMRI、R、MS和元素分析对合成产物及有关中间体——α,α′-二邻苯二甲酰亚胺基己二酸二乙酯、α,α′-二氨基己二酸进行了表征。 相似文献
17.
以苯甲醛和环己酮为原料,在碱性条件下,采用相转移催化法,利用微波技术制备了α,α’-二亚苄基环己酮,并用FTIR、^1HNMR和MS表征了该化合物的结构。该法具有操作简单、产率高、污染少等优点。 相似文献
18.
19.