Expanding the Balz-Schiemann Reaction: Organotrifluoroborates Serve as Competent Sources of Fluoride Ion for Fluoro-Dediazoniation
作者:Tharwat Mohy El Dine、Omar Sadek、Emmanuel Gras、David M. Perrin
DOI:10.1002/chem.201803575
日期:2018.10.9
The Balz–Schiemann reaction endures as a method for the preparation of (hetero)aryl fluorides yet is eschewed due to the need for harsh conditions or high temperatures along with the need to isolate potentially explosive diazonium salts. In a departure from these conditions, we show that various organotrifluoroborates (RBF3−s) may serve as fluorideion sources for solution‐phase fluoro‐dediazoniation
PyridineN‐oxide–BF2CF3 and –BF2C2F5 complexes and their derivatives were synthesized. Most of the complexes show fluorescence both in solution and in the solid state. By expanding the π‐conjugated skeleton, the color of the fluorescence could be changed dramatically. A fluorophore with a high solvent dependency could also be produced. Since such compounds can be synthesized on a gram scale in high
The influence of the nature of phosphine ligand on palladium catalysts for cross-coupling of weakly nucleophilic potassium pentafluorophenyltrifluoroborate with ArHal and PhCH2Hal (Hal=Br, Cl)
作者:Anton Yu. Shabalin、Nicolay Yu. Adonin、Vadim V. Bardin、Valentin N. Parmon
DOI:10.1016/j.tet.2014.04.019
日期:2014.6
the nature of bulky phosphines used as ligands. As a result, conditions for involving the electron-deficient organoboron reagent—potassium pentafluorophenyltrifluoroborate—in the palladium-catalyzed cross-coupling with aryl bromides and arylchlorides were identified. It was demonstrated that the chosen conditions are appropriate for the reaction of K[C6F5BF3] with benzyl chloride and benzyl bromide
<sup>1</sup>
H, <sup>13</sup>
C, <sup>19</sup>
F and <sup>11</sup>
B NMR spectral reference data of some potassium organotrifluoroborates
作者:Roberta A. Oliveira、Ricardo O. Silva、Gary A. Molander、Paulo H. Menezes
DOI:10.1002/mrc.2467
日期:2009.10
Complete (1)H, (13)C, (19)F and (11)BNMRspectraldata for 28 potassiumorganotrifluoroborates are described. The resonance for the carbon bearing the boron atom is described for most of the studied compounds. A modified (11)BNMR pulse sequence was used and better resolution was observed allowing the observation of (11)B-(19)F coupling constants for some of the studied compounds.
Ag(<scp>i</scp>)/persulfate-catalyzed decarboxylative coupling of α-oxocarboxylates with organotrifluoroborates in water under room temperature
作者:Sheng Chang、Jian Feng Wang、Lin Lin Dong、Dan Wang、Bo Feng、Yuan Tai Shi
DOI:10.1039/c7ra10924e
日期:——
AgNO3 using K2S2O8 as oxidant to generate diarylketone products in high yields. The method is novel, simple, safe and efficient. Both aryl substituted potassium α-oxocarboxylates and organotrifluoroborates proceeded smoothly in water under room temperature. The utilization of α-oxocarboxylates as acylatingagent presents some elements of interest.
α-氧代羧酸盐和有机三氟硼酸盐的脱羧偶联反应在催化AgNO 3的存在下使用K 2 S 2 O 8作为氧化剂顺利进行,从而以高收率生成二芳基酮产物。该方法新颖,简单,安全,高效。芳基取代的α-氧代羧酸钾和有机三氟硼酸在室温下均能顺利进行。α-氧代羧酸盐作为酰化剂的利用表现出一些令人感兴趣的元素。