氯甲烷

The structures were identified by IR, UV,〓 NMR and element analyses. 2. Free radical 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxyl as catalyst, the phase transfer catalyzed method of oxidation eighteen semicarbazides to N-Aryl-2-Phenyl diazenecarboxamide with a solution of potassium ferricyanide in 2N aqueous sodium hydroxide and dichloromethane is described for the first time.

利用2，2，6，6-四甲基-4-羟基-1-哌啶氮氧自由基为相转移催化剂，在饱和铁氰化钾的2N氢氧化钠溶液与二氯甲烷的两相反应液中，催化氧化十八个取代氨基脲得到十八个相应的新型偶氮化合物N，2-二芳基二氮亚烯甲酰胺，均获得了较高的产率。

Results The tail formation rate of model group was significantly higher than the rate of control group (P＜0.05) with a large number of Ⅲ and Ⅳ DNA damage cells. The tail formation rate of dichloromethane extraction groups were both significantly lower than the rate of model group (P＜0.05). p53 mRNA expression of model group was higher than the rest except the crude Cornus Officinalis group.

结果 D-半乳糖致衰模型组小鼠骨髓细胞DNA拖尾率高于正常对照组(P＜0.05)，且Ⅲ、Ⅳ级损伤细胞数较多；山茱萸生品及制品二氯甲烷萃取部位组小鼠骨髓细胞DNA的拖尾率均低于D-半乳糖致衰模型组(P＜0.05)。D-半乳糖致衰模型组小鼠骨髓细胞p53基因的表达高于正常对照组、阳性药组及制品组。

Optimization technology was acetidin: N-hexane (3:7) as low-pole solvent system, methanol: dichloromethane (1:9) as polar solvent system, 20% glycerol filter paper as moisturizer, 14 h age Bacillus subtilis as indicating strain seed on thin layer plate cultivated for 14~18 h, 1% TTC staining time 1~2 h, bacterial mix method suitable to 0.2%~0.6% agar semisolid bouillon culture-medium, bacterial spread method suitable to 1% agar semisolid bouillon culture-medium.

结果：该方法展开系统筛选简单，抑菌斑位置准确、斑点清晰，其优化条件为：以乙酸乙酯：正己烷(3：7)为弱极性展开系统，甲醇：二氯甲烷(1：9)为强极性展开系统，用20%甘油滤纸对湿室保湿，以14h菌龄的枯草芽孢杆菌为指示菌种子液，自显影薄层板36℃培养14~18h，1%TTC显色时间为1~2h，含0.2%~0.6%琼脂的半固体肉汤培养基应使用混菌法生物自显影，含1%琼脂半固体肉汤培养基应使用涂布法生物自显影。

My company's main products are R11, R12, R13, R22, R227, R502, R141b, R142b, R152a, R113, R134a, R402A (HP80), R402B (HP81), R404A (HP62), R123, R407C, R410A, R507 , Tsinghua series refrigerants, as well as some related products such as dichloromethane, chloroform, halons, refrigeration oil and blowing agent (R11, R245) and so on.

我公司的主要产品有 R11 、 R12 、 R13 、 R22 、 R227 、 R502 、 R141b 、 R142b 、 R152a 、 R113 、 R134a 、 R402A （ HP80 ）、 R402B （ HP81 ）、 R404A （ HP62 ）、 R123 、 R407C 、 R410A 、 R507 、清华系列制冷剂，以及一些相关产品如二氯甲烷、三氯甲烷、聚四氟乙烯、冷冻油及发泡剂（ R11 、 R245 ）等。

The structure of the target compound was confirmed by elementary analysis and nuclear magnetic resonance spectroscopy .

通过元素分析、核磁共振氢谱对其结构进行了确认，并测得其在二氯甲烷溶液中的紫外吸收光谱和荧光光谱。

The results indicated that the highest yield of BOC-indigo was 97% in CH2Cl2, and the lowest one was in PGMEA. It showed that the yield of BOC-indigo increased with high polarity and low molecular volume of solvent.

从实验结果得知，以极性较强且分子体积较小的二氯甲烷作为反应溶剂，其合成隐性颜料产率可达到97.2%，较四氢呋喃产率多4.4%，且较丙二醇甲醚乙酸酯产率多7.4%。

With TEMPO(5 mol%) as the catalyst,N-methyl-N-phenyl-hydrazine(1.2 equiv.) as the amine source,the direct ortho-amination of 2-naphthols could be easily achieved.The reaction was carried out at room temperature under air atmosphere.

以5 mol%TEMPO为催化剂，1.2当量N-甲基-N-苯基肼作氨源，二氯甲烷为溶剂，空气中，室温下，实现了对2-萘酚邻位氨基化，可以高效的合成1-氨基-2-萘酚类化合物。

With TEMPO(5 mol%) as the catalyst,N-methyl-N-phenyl-hydrazine(1.2 equiv.) as the amine source,the direct ortho-amination of 2-naphthols could be easily achieved.

以5 mol%TEMPO为催化剂，1.2当量N-甲基-N-苯基肼作氨源，二氯甲烷为溶剂，空气中，室温下，实现了对2-萘酚邻位氨基化，可以高效的合成1-氨基-2-萘酚类化合物。

This article describes the low pressure fluorination process for production of dichlorodifluoromethane , discusses the problems of prevailing in the process and proposes an improved process-high pressure fluorination reactor with external circulation.

介绍了二氟二氯甲烷低压氟化反应的生产过程，指出和剖析了生产技术中存在的问题，提出了采用外循环加压氟化反应器的改进措施。改进后的反应器具有生产能力大，反应气质量好，催化剂损耗低等特

Dissolve the entire dry acetylation product in a minimum of methylene chloride in an Erlenmeyer flask.

用少量的二氯甲烷，把全部干的乙醯化产物溶解在锥形瓶中。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。