排序方式: 共有19条查询结果,搜索用时 46 毫秒
1.
Hai-Ping Cao 《Journal of fluorine chemistry》2006,127(8):1079-1086
In the presence of sodium dithionite and DMSO, the intramolecular radical cyclization of 4-chloro-1,1,2,2,3,3,4,4-octafluorobutylbenzenes is achieved to give the corresponding cyclic compounds in moderate to good yields. 相似文献
2.
通过苯基甲基二乙氧基硅烷和苄基甲基二乙氧基硅烷的缩合反应制备了聚苯基甲基和聚苄基甲基硅氧烷。研究了它们与含氟酰基过氧化物间的反应。经酸碱滴定及IR、^1H NMR和^19F NMR光谱分析确证反应主要生成苯环上氟烷基取代产物。通过测定经氟烷基化后聚硅氧烷处理的玻璃表面的接触角,初步评价了氟烷基化率对其表现性能变化的影响。 相似文献
3.
Wei-peng Li Yu-cheng Zhu Yan-jun Zhou Hong-wei Yang Cheng-jian Zhu 《Tetrahedron》2019,75(12):1647-1651
We developed a method to synthesize fluorinated 1,4-unsaturated dicarbonyl compounds via photoredox catalyzed radical addition process. Commercially available ethyl bromodifluoroacetate (BrCF2CO2Et) as fluoroalkyl source, the corresponding fluoro-containing dicarbonyl compounds could be obtained in moderate to good yields. 相似文献
4.
Jinbo Hu 《Journal of fluorine chemistry》2009,(12):1130-1139
Selective incorporation of a fluoroalkyl moiety to modulate the properties of an organic molecule has become a frequently used strategy in life science- and materials science-related applications. In this context, selective introduction of a (phenylsulfonyl)difluoromethyl group (PhSO2CF2) into organic molecules has attracted much attention, since the PhSO2CF2 group can be regarded as a “chemical chameleon” that can be readily transformed into difluoromethyl (CF2H), difluoromethylene (–CF2–), and difluoromethylidene (CF2) functionalities. This article overviews the recent development of (phenylsulfonyl)difluoromethylation reactions from 2003, including the nucleophilic (phenylsulfonyl)difluoromethylations with PhSO2CF2H, PhSO2CF2SiMe3 and PhSO2CF2Br reagents, free radical (phenylsulfonyl)difluoromethylations with PhSO2CF2I reagent, and electrophilic (phenylsulfonyl)difluoromethylations with a hypervalent iodine(III)-CF2SO2Ph reagent. 相似文献
5.
D.Y. Mikhaylov T.V. Gryaznova I.A. Litvinov O.G. Sinyashin 《Journal of organometallic chemistry》2009,694(24):3840-172
An efficient nickel-catalyzed method devoted to the direct addition of perfluoroalkyl halides (I, Br) to α-methylstyrene is described. This procedure allows for synthesis of compounds resulting from addition-dimerization in good yields. 相似文献
6.
利用相转移催化剂十六烷基三甲基溴化铵(CTMAB)催化的连二亚硫酸钠引发的苯酚衍生物与含氟碘代烷的氟烷基化反应, 合成了含氟烷基取代的酚类化合物. 研究了双酚A与含氟碘代烷的氟烷基化反应, 得到了一类重要的含氟单体, 即含氟烷基取代的双酚A衍生物. 通过改变含氟碘代烷与双酚A的摩尔比, 可以得到单取代、二取代和四取代的含氟烷基双酚A衍生物. 相似文献
7.
梅焕谋 《高等学校化学学报》1988,(12)
近年来,以锌为催化剂用超声波进行氟烷基化反应已有不少报道,但反应物限于全氟烷基碘R_F I。对于I(CF_2)_2 I(Ⅰ)、I(CF_2)_4I(Ⅱ)这类α,ω-二碘全氟烷烃未见报道。作者用(Ⅰ)或(Ⅱ)在DMF或THF中,于室温下加入锌粉(锌粉经活化或未活化),立即有气体逸出,若施加超声波,气体更甚。加入碘苯亦无预期产物,这是符合β-断裂、碘极易脱离生成全氟烯烃之说的。 相似文献
8.
In the past few years, organic chemists have made significant contributions to the development of difluoromethylation and difluoromethylenation of carbon nucleophiles via difluorocabene intermediate. This article summarizes the recent progress of CCF2 and CCF2 functionalization with difluorocarbene. 相似文献
9.
Lingui Zhu 《Tetrahedron letters》2010,51(47):6150-6152
Nucleophilic (phenylsulfonyl)difluoromethylation of both alkyl iodides and bromides was successfully accomplished by using CsF/15-crown-5 as an initiating system in DME, and the amount of 15-crown-5 was found to be critical to the yield of the product. The prepared (phenylsulfonyl)difluoromethylated alkanes were converted into gem-difluoroalkenes by a base-mediated 1,2-elimination reaction, and the latter species could be further transformed into trifluoromethyl compounds in the presence of KF/18-crown-6 or TBAF. 相似文献
10.
Dr. Zhigang Ma Dr. Xinxin Wu Prof. Dr. Chen Zhu 《Chemical record (New York, N.Y.)》2023,23(9):e202200221
Fluorine incorporation by concomitant fluoroalkyl radical addition to alkene or alkyne and functional group migration (FGM) represents an ingenious and robust strategy for the synthesis of structurally diverse fluorinated compounds. This account gives an overview of related studies in our group, in which three main reaction modes are discussed: 1) radical fluoroalkylative difunctionalization of unactivated alkenes via intramolecular FGM; 2) alkene difunctionalization by docking-migration process using fluoroalkyl-containing bifunctional reagents; 3) incorporation of fluoroalkyl group into C(sp3)−H bond via consecutive hydrogen atom transfer (HAT) and FGM. Relying on these methods, a variety of trifluoromethylation and di-/mono-fluoroalkylation reactions along with the migration of cyano, heteroaryl, oximino, formyl, alkynyl, and alkenyl groups have been accomplished under mild conditions. 相似文献