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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%。

In our paper,1-hexylcarbamoyl-5-fluorouracils and1-cyclohexyl-carbamoyl-5-fluorouracils were prepared through 5-fluorouracil reacting with hexyl isocyanate or cyclohexyl isocyanate by using dimethylaminopyridine as the catalyst.

以5-氟尿嘧啶(5-FU)、正己基异氰酸酯和环己基异氰酸酯为原料,在N,N-二甲氨基吡啶的催化下,通过N-脲化反应制成1-己基氨基甲酰基-5-氟尿嘧啶及1-环己基氨基甲酰基-5-氟尿嘧啶。

Large single crystals were also obtained by using pyrocatechol as additive. It was shown by 〓Si-NMR and IR that Sipyrocatechol complex was formed in the reaction system.

在F〓体系中,F〓对铝源和硅源起络合和矿化作用,形成可溶性氟硅酸盐AlF〓〓、SiF〓〓络合物,然后缓慢水解成含氧氟硅酸盐络合物,它们再发生定向缩聚,提供了分子筛晶体生长所需的可溶性结构单元。

This invention is directed to the-tartaric acid salt of 2-amino-N-{1-(2,4-difluoro-benzyloxymethyl)-2-oxo-2-3-oxo-3a-pyridin-2-ylmethyl-2-(2,2,2-trifluoroethyl-2,3,3a, 4,6,7-hexahydro-pyrazolo(4,3-c) pyridin-5-yl-ethyl}-2-methyl-propionamide which is a growth hormone secretagogue and as such is useful for increasing the level of endogenous growth hormone.

本发明涉及2-氨基-N-{1--(2,4-二氟-卞氧甲基)-2-氧代-2-3-氧代-3a-(R-吡啶-2-基甲基-2-(2,2,2-三氟-乙基)-2,3,3a,4,6,7-六氢化-吡唑子基(4,3-c)吡啶-5-基-乙基}-2-甲基-丙酰胺的--酒石酸盐,它是一种生长激素促分泌素,并且可用于提高内源性生长激素水平。

Sulfonated poly are prepared by direct polymerization of biphenol A, disodium 4, 4"-difluoro-3, 3"-disulfonate-1, 1-diphenylketone and 2, 6-difluorobezonitrile. The polymers are characterized with ~1H-NMR, FT-IR.

以双酚A,2,6-二氟苯腈和4,4′-二氟-3,3′-二磺酸钠-1,1′-二苯酮采用直接缩合法合成了不同磺化度的磺酸型聚芳醚腈酮,通过FT-IR和~1H-NMR对聚合物进行了表征,证明其结构正确。

The use of perfluorous nonene solvent allowed the formation of a fluorous biphase system with the ester products thereby driving the esterification equilibrium to move rightly.

在不移走生成物的条件下,酯与全氟壬烯能形成氟两相体系而脱离酯化可逆反应体系,促进反应平衡右移,使收率提高10%~47%,氟溶剂通过冷却和简单的相分离,就可回收并直接套用。

Some useful fluorine-containing intermedi-ates were synthesized by the reaction of activated methylenecompounds or silyl enol ether with 2,2-dihydropolyfluoro-alkanoates or 2-hydropolyfluoroalk-2-enoates in the presenceof different bases.

进一步研究表明,在氢化钠的作用下,苯乙腈,苄基苯基甲酮也可以与2-氢多氟-2-烯酸乙酯发生亲核加成反应,苄基苯基甲酮的加成中间体经多聚磷酸环化,得到了间位氟烷基取代的α-萘酚衍生物。

Water samples were extracted and purified and collected by solid-phase extraction LC-18 column. Soil samples were extracted by ethyl acetate/petroleum ether (2:1, by vol) and purified by sulphonation. Wheat sample was extracted by acetonitrile/water (4:1, by vol) and purified and collected by SPE- Florisil column.

水样直接用LC-18固相萃取小柱分离、净化和富集;采用乙酸乙酯/石油醚(体积比2:1)振荡提取,磺化法净化,测定土壤中氯氟吡氧乙酸残留量;以乙腈/水(体积比4:1)为提取剂,氟罗里硅土固相萃取小柱分离、净化,测定小麦样品中氯氟吡氧乙酸的残留量。

In the process, 2, 4-difluoroaniline is used to carry out ammoniated reaction. Then through a series of similar reactions, the important intermediate of temafloxacin, which is called 7-chloro-6-fluoro-1-(2, 4-difluorophenyl)-1, 4-dihydro-4-oxo-3-quinoline acid, is gained.

与环丙沙星和二氟沙星类似,用2,4-二氟苯胺进行胺化反应,再进行一系列类似的反应,制得合成替马沙星的关键中间体7-氯-6-氟-1-(2,4-二氟苯基)-1,4-二氢-4-氧代喹啉-3-羧酸。

Study on Nitrogen Forms in Chaohu Lake and Wabu Lake Sediments;2. Fluorine, one of the necessary trace elements of human beings is presented in the form s of inorganic and organic compounds in foods, such as sodium fluoride, silicon fluoride, and fluoroacetate etc.

文中阐述了食品中氟的赋存形态及其分析方法,研究了灰化、碱熔、微量扩散、氧瓶燃烧、酸浸提及高温燃烧水解等前处理方法提取氟的形态差异,并对食品中氟的分析提出了建议。

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