氟化反应

The reaction of perfluoroalkyl bromide and a,w-perfluoralkylene dibromide in sulfinatodehalogenation system with olefins and the differences in behavior between perfluoroalkyl bromides and their corresponding iodides are reported.

本文报道溴代全氟烷和α，ω-二溴代全氟烷在亚磺化脱卤反应体系中与烯烃的反应及其与相应的碘代全氟烷的区别。

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。

Difluorodiphenylsulfone and 4, 4"-difluorodiphenylketone are sulfonated by 50 % sulfuric acid. A new biphenol monomer containing six-membered ring imide is synthesized by reaction of 1, 4, 5, 8-naphthelenetetracarboxylic acid dianhydride with 3-aminophenol or 4-aminophenol sodium.

以50%发烟硫酸为磺化试剂，以4，4′-二氟二苯砜和4，4′-二氟二苯酮为原料反应得到双磺化的4，4′-二氟-3，3′-二磺酸钠-1，1′-二苯砜和4，4′-二氟-3，3′-二磺酸钠-1，1′-二苯酮。

Bifluoro nitrobenzene was the raw material of synthesis of asymmetry chromotropic acid bisazo fluoroarsen reagent, By way of ammonia substitution, arsonation, reduction and coupled reactions, bisazo fluoroarsen was synthesized.

以2，4—二氟硝基苯为起始原料，经过氨取代、胂酸化、还原、偶联反应合成了偶氮氟胂Ⅰ，然后分别选择不同的取代苯胺与偶氮氟胂Ⅰ偶联，合成了一系列的不对称变色酸偶氮氟胂。

A series of crosslinked sulfonated polys were synthesized from 4,4'-difluorodiphenyl sulfone, 4,4'-biphenol, 3,3'-disulfonate-4,4'-difluorodiphenyl sulfone and 1,3,5-trihydroxy benzene by nucleophilic substitution polycondensation reactions. The trifunctional crosslinker of THB was in the mass fraction range of 3%-7%.

以4，4'-二氟二苯砜、4，4'-联苯二酚、3，3'-二磺化－4，4'-二氟二苯砜二钠盐和三羟基苯为原料，经高温溶液缩聚反应，制备了一系列不同磺化度的新型交联磺化聚芳醚砜。

Sulfur compounds in the diesel were selectively derived into methylsulfonium salts by reacting with iodomethane in the presence of silver tetrafluoroborate, and characterized by positive-ion electrospray ionization fourier transform ion cyclotron resonance.

在四氟硼酸银的催化作用下，以碘甲烷对直馏柴油进行甲基衍生化反应，使其中的有机硫化物转变成极性较强的锍盐，再用电喷雾－傅立叶变换离子回旋共振质谱仪进行检测。

FDG PET/CT is valid to monitor treatment response post chemotherapy and radiation therapy in most oncological situations.

在肿瘤学上，氟化去氧葡萄糖正子电脑断层造影可以有效监测化学治疗和放射线治疗反应。

There were no significant differences for the firing rates in the site of contralateral TNC neurons among during pre-CSD,CSD,and post-CSD (P＞0.05).For flunarizine group,the firing rates in the site of ipsilateral TNC neurons during pre-CSD were higher as compared with during CSD(P＜0.05).2.1 There were statistical differences on palasma levels of CGRP and SP among the three groups(P＜0.05).The levels of CGRP and SP in CSD group were higher than control group(P＜0.05).No significant differences on the levels of CGRP and SP in ipsilateral trigeminal ganglia were found among the three groups(P＞0.05).2 The number of neurons with positive CGRP and SP immunoreactivity was statistically different in right-sided trigeminal ganglia among the three groups (P＜0.05).The number in fight-sided trigeminal ganglia in CSD group was higher as compared with control group(P＜0.05).The number in right-sided trigeminal ganglia was statistically higher than that in left-sided trigeminal ganglion in CSD group(P＜0.05).3.1 Altered ReHo in ipsilateral pons and other brain regions response to pain such as basal nuclei,thalamus,cingulated gyms and prefrontal cortex was detected during the acute spontaneous attack as compared with during headache remission(P＜0.05,corrected by Monte Carlo simulation). 2 Positive functional connectivity was detected between ipsilateral pons and other brain regions related to pain within pain state and within non-pain state (P＜0.05,corrected by false discovery rate,FDR).Increased functional correlation between ipsilateral pons and other pain-related brain regions such as ipsilateral prefrontal cortex and contralateral subcallosal gyrus was detected during the acute spontaneous attack as compared with during headache remission(P＜0.05,corrected by Monte Carlo simulation).

结果1。对照组未发现CSD；同侧TNC放电频率，CSD中＞CSD后＞CSD前P＜0.05对侧TNC放电频率，CSD前、中、后无统计学差异(P＞0.05氟桂利嗪组同侧TNC放电频率，CSD前＞CSD中(P＜0.05)，CSD前与CSD后及CSD中与CSD后之间无统计学差异(P＞0.05)。2.1关于放免测定，各组血浆CGRP、SP水平有统计学差异(P＜0.05)，CSD组高于对照组(P＜0.05)，CSD组与氟桂利嗪组、对照组与氟桂利嗪组之间均无统计学差异P＞0.05各组之间同侧三叉神经节中CGRP、SP水平未见变化(P＞0.05.2关于免疫组化研究，右侧三叉神经节CGRP、SP免疫阳性细胞数三组之间有统计学差异(P＜0.05)，多重两两比较结果CSD组大于对照组(P＜0.05)，CSD组与氟桂利嗪组之间、对照组与氟桂利嗪组之间无统计学差异P＞0.05左侧三叉神经节CGRP、SP免疫阳性细胞数三组之间无统计学差异(P＞0.05CSD组中右侧三叉神经节CGRP、SP免疫反应阳性细胞数大于左侧(P＜0.05)。3.1局部一致性分析发现两组患者头痛疼痛状态较非疼痛状态脑活动发生变化的脑区有同侧脑桥以及其他疼痛相关脑区如基底节区、丘脑、扣带回、前额叶皮层等(P＜0.05，蒙特卡罗模拟校正)。2功能连接分析发现疼痛状态与非疼痛状态下主要疼痛相关脑区均与同侧脑桥有功能联系P＜0.05，false discovery rate，FDR校正疼痛状态与非疼痛状态比较，同侧前额叶皮层、对侧胼胝下回等疼痛相关脑区与同侧脑桥之间功能联系增强(P＜0.05，蒙特卡罗模拟校正。

It reacts violently with oxygen difluoride and barium peroxide.

一氧化碳同氟化氧、氧化钡会发生剧烈反应。

Melting point 3410 ℃, boiling point 560 ℃, relative density of 1935, F the external electronic structure of 5d46s2, in the chemical reaction time is very easy to lose 1-6 electronic, but also can get 1-2 electronic, so oxidation number of 0,± 1,± 2, 3, 4 , 5 and 6, with 6 price of the most stable compounds, such as WO3 does not dissolve in water, the air will form in the tungsten trioxide thin protective layer of tungsten, tungsten with fluorine at room temperature, chemical combination, red hot when there is no moisture and Bromine iodide together, red hot when you can and water reaction WO3, at room temperature reaction of tungsten with aqua regia, but the hot concentrated hydrochloric acid and sulfuric acid can only be played with its weak response, but molten nitrate, nitrite, too Hydrogen peroxide, sulfur steam, steam and other phosphorus can play intense reaction, high temperature can not be carbon, boron and silicon reaction of binary compounds, widely used in industrial tungsten steel and tungsten carbide, pure tungsten filament is used to the system, and X-ray tube Tube heating components, semiconductor components can be prepared tungsten silicide, tungsten industrial production is white or black tungsten ore tungsten ore refining.

熔点3410℃，沸点560℃，相对密度1935，F外围电子结构为5d46s2，在化学反应时很容易丢掉1—6个电子，也能得到1—2个电子，所以氧化数为0、±1、±2、＋3、＋4、＋5和＋6，以＋6价化合物最稳定，如WO3不溶于水，空气中的钨会形成薄层三氧化钨保护层，钨能与氟在室温下化合，红热并无潮气时能与溴、碘化合，红热时还能和水反应生成WO3，室温下钨可与王水反应，但热的浓盐酸和硫酸只能与其起微弱反应，但对熔融的硝酸盐、亚硝酸盐、过氧化氢、硫蒸汽、磷蒸汽等能起激烈反应，高温下不能与碳、硼和硅反应生成二元化合物，工业上广泛使用钨钢和碳化钨，纯钨用来制灯丝、电子管和X射线管的发热元件，硅化钨可制半导体元件，钨工业生产是将白钨矿石或黑钨矿石精炼。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。