查询词典 chloro-hydrocarbons

Gas Chromatography;Relative Density;alpha-Chloro reaction;dodecanoic acid;alpha-chlorododecanoic acid;fatty acid

本文建立的气相色谱-相对密度耦合法，有利于在线监控脂肪酸的α-氯代反应深度。

Preliminary bioassay showed that all the synthesized compounds just showed a poor inhibition rate (0~45%) at 500 mg/L, much weaker than (72%~87%). The result suggested that chloro-atom on 2-position of pyridine ring may be indispensable for herbicidal activity.

初步除草活性测定结果表明，在500mg/L剂量下，所有化合物的除草活性（抑制率0~45%）远低于先导化合物（抑制率72%~87%），说明吡啶环2-位上的氯原子可能对维持该类化合物的除草活性是必需的。

Tetrachloroterephthalic acid was prepared by chlorinating terephthalic acid, oleumsolvent and iodine catalyst. Tetrachloroterephthalic acid was acylated by sulphurous oxychloride in the presence of DMF to form tetrachloroterephthaloyl chloride. The acyl chloride product was fluorinated by potassium fluoride and esterified by methanol to synthesize dimethyl tetrafluoroterephthalate. The ester was reduced with potassium borohydride and lithium chloride to give tetrafluoroterephthalyl alcohol. The above product was bromated in the hydrobromic acid to obtain 4-bromomethyl-2,3,5,6-tetrafluoro-benzene methanol. 4-Methyl-2,3,5,-6-tetrafluorobenzene ethanol was obtained by reducing the bromide with magnesium. In the exist of DCC and DMAP, tefluthrin was got by the condensation reaction between 4-methyl-2,3,5,6-tetrafluoro-benzene methanol and-(1RS,3RS)- 3-(2- chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethyl cycolpropanecar-boxylate acid.

对苯二甲酸与氯气在碘存在下以发烟硫酸为溶剂进行氯化制备四氯对苯二甲酸；再以DMF为催化剂与二氯亚砜反应生成四氯对苯二甲酰氯；以氟化钾为氟化剂，环丁砜为溶剂置换氟化，再与甲醇酯化得到四氟对苯二甲酸甲酯；以KBH4-LiCl为还原剂二甲醚为溶剂反应制得四氟对苯二甲基苄醇；以氯苯为溶剂在溴化氢溶液中溴化得到溴化产物；在乙醇溶液中经镁粉还原得到4-甲基-2，3，5，6-四氟苄醇；甲基苄醇与功夫酸在催化剂二环己基碳二亚胺和4-二甲氨基吡啶作用下缩合得到七氟菊酯，总收率达43.6%。

The ionization enthalpies of acetic acid, chloro-, bromo- and iodo- acetic acids were measured at 5℃ intervals between 20℃ and 45℃ in aqueous solution by LKB-2277 Bioactivity Monitor.

本文用LKB-2277BioActivityMonitor以5℃的间隔测量了20-45℃温度区间乙酸、氯乙酸、溴乙酸和碘乙酸在水溶液中的电离焓。

In conclusion, 5-chloro-2-4-(aryloxyalkylpiperazin-1-ylbenzo- oxazole compounds were novel candidates as potential α1-AR antagonist.

5-氯-2-[4-哌嗪-1-基]类化合物是一类新的具有潜在开发价值的α1受体拮抗剂。

Methods:2-Hydroxy-4-methyl-3-nitropyridine was reacted with phosphorous pentachloride to give 2-chloro-4-methyl-3-nitropyridine.

以4-甲基-3-硝基-2-羟基吡啶为起始原料，与五氯化磷进行卤代反应制得4-甲基-3-硝基-2-氯吡啶。

Chloro-5,12-naphthacenequinone was synthesized from 2-(1-hydroxy-2-naphthyl)carbonylbenzoic acid by chlorination reaction using a mixture of phosphorus pentachloride and phosphorus oxychloride as a chlorating agent and then by ring-closing reaction using sulfuric acid as a dehydrating agent.

以2-[(1-羟基-2-萘基)羰基]苯甲酸为原料、五氯化磷/三氯氧磷为氯化剂进行氯化反应，然后用浓硫酸脱水环化，合成了6-氯-5，12-萘并萘醌，优化了反应条件，总收率达68.2%。

Synthesis of Organic Pigmet Intermidiate N, N'- bisacetylaceto - 2 - methyl - 5 - chloro -1,4- Phenylenediamine

有机颜料中间体N，N′-双乙酰乙酰基2-甲基-5-氯代-1，4-苯二胺的合成

The results show the toxicity of the chloro-anilines to photobacterium phosphoreum increases with the decrease of the energy of the lowest unoccupied molecular orbital and the increase of the number of chlori.

结果表明：该类化合物对发光细菌的毒性作用随分子最低空轨道能级的降低而增大，随分子中氯取代数目的增加而增大

First, the in vitro metabolism of 6-chloro butyl phthalide was investigated and a HPLC method for the study of the in vitro metabolism of butyl phthalide analogues was developed.

首先研究了6-氯正丁苯酞的体外代谢，建立了研究氯丁苯酞及其类似物体外代谢转化的HPLC分析方法，并弄清了它们代谢转化的一般规律。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。