氟

It's not clear if the indication with end scale 475°means at Fahrenheit degree, and in this case it would be a problem because the protective PFOA is steady until 260° and PFOA degrade.

目前还不清楚是否与结束的标志意味着在华氏度量表475程度，在这种情况下，它会是个问题，因为保护性的全氟辛酸及其盐类PFOA稳定到2.6摄氏度，全氟辛酸及其盐类

The fluoride-vanish on the orthodontic treatment of enamel demineralization has significant inhibitory effect.......

氟保护漆对正畸治疗中的釉质脱矿有明显抑制作用。釉质脱矿；氟保护漆；正畸

The appropriate temperature of diazotization was-10～-5℃,and the diazotizating fluoborate was decomposed in petroleum ether to get 2-chloro-3-fluoropyridine with 64% yield.

以2-氯-3-氨基吡啶为原料，在40%的氟硼酸溶液中，采用饱和的亚硝酸钠为重氮化剂，在-10~-5℃下进行重氮化反应制得重氮盐，在石油醚中热分解得到2-氯-3-氟吡啶，收率为64%。

Hexafluoroisopropanolis an important fluorinated intermediate,which can be used for synthesized medicament or perfect dissolvent of polymer.

六氟异丙醇是一种重要的含氟中间体，可用于医药中间体和作为理想的聚合物溶剂。

The reaction of polyfluoroalkyl iodides with 4-pentenoic acids in the presence of sodium dithionite at room temperature in aqueous acetonitrile solution [CH〓CN: H〓O=3: 1 ] to gave the corresponding adducts, the latter could form γ-lactones 31～51 in the same medium in 62～92％ yield.

室温下，在乙腈/水[3：1]的介质中，多氟烷基碘化物在连二亚硫酸钠的存在下与4-戊烯酸及其在2或3位上具有取代基团的衍生物进行反应，反应2～5h，起先生成两者的加成物，该加成物无需分离，在同一介质中，可进一步反应得到相应的多氟烷基取代的γ-丁内酯31～51，产率62％～92％。

The influence of each condition on the reaction speed and yield was studied, and the optimal conditions were: the ratio of the amount of substance of aromatic amine and heptafluoro-isopropyl iodine was 1:1.1~1.5, the amount of substance of sodium dithionite, sodium bicarbonate, aniline compounds were respectively 1.1~1.3, the amount of substance of phase transfer catalyst TBAB and aniline compounds was 0.05~0.1, the concentration of aniline compound was 0.5~1.0 mol/L, reaction temperature was 10~20 ℃, and the solvent was aether.

最佳结果为：芳胺与七氟异丙基碘的物质的量比1：1.1~1.5，连二亚硫酸钠、碳酸氢钠与苯胺的物质的量分别为1.1~1.3，相转移催化剂四丁基溴化铵与苯胺的物质的量比在0.05~0.1，溶剂总用量使苯胺浓度在0.5~1.0 mol/L；反应温度10~20℃；溶剂采用乙醚。取代基供电子性越强，反应时间越短，产率越高；氨基的对位优先反应，氨基的邻位较难发生反应；且七氟异丙基总是优先取代在芳环电子云密度较高的位置上。

Aniline compounds containing heptafluoroisopropyl was synthesized through taking sodium dithionite as evocating agent, and introducing heptafluoroisopropyl by free radical electrophilic substitution on benzene ring.

以连二亚硫酸钠为引发剂，在苯环上通过自由基亲电取代反应引入七氟异丙基，合成了一系列含七氟异丙基的苯胺类衍生物，研究了各种条件对反应的速度和收率的影响。

Polyfluoroalkyl iodides could react with unsaturated olefin acids in the presence of sodium dithionite by radical addition to give adducts. It was found that these adducts could form polyfluoroalkyl substituted γ or δ-lactones due to intramolecular nucleophilic substitution in the alkali solution.

研究发现：多氟烷基碘化物在连二亚硫酸钠存在下与不饱和烯酸经自由基加成得到的产物，能在碱性条件下进行分子内亲核取代反应形成五元或六元环的含氟内酯类化合物。

Using a mildly radioactive compound called 18F-fluoro-L-dihydroxyphenylalanine, or [18F]-DOPA, the researchers diagnosed focal or diffuse hyperinsulinism correctly in 23 of the 24 cases, for an accuracy of 96 percent.

通过使用一种名为18氟-左旋多巴或18氟-多巴的非刺激性的放射性物质，研究者在24例患儿中精确的诊断出23例局部或弥散型高胰岛素症，准确度达96%。

Using a mildly radioactie compound called 18F-fluoro-L-dihydroxyphenylalanine, or [18F]-DOPA, the researchers diagnosed focal or diffuse hyperinsulinism correctly in 23 of the 24 cases, for an accuracy of 96 percent.

通过使用一种名为18氟-左旋多巴或18氟-多巴的非刺激性的放射性物质，研究者在24例患儿中精确的诊断出23例局部或弥散型高胰岛素症，准确度达96%。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。