Hbf4r
![Scheme 1. C–O bond formation with HBF4 at room temperature.[a] dr ...](https://www.researchgate.net/publication/283971632/figure/fig8/AS:296597712850983@1447725813776/Scheme4-C-C-bond-formation-with-HBF4-at-room-temperaturea-a-Isolated-yields-1H-NMR_Q320.jpg "Hbf4r")
![New hybrid: [H-β-(4-pyridyl)-Ala-OH] tetrafluoroborate – crystal ...](https://xpic.x-mol.com/20230615/10.1039_D3CE00308F.jpg "Hbf4r")
![三- 叔 -丁基膦四氟硼酸盐 - TTBP·HBF4, [(t-Bu)3PH]BF4](https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/structures/344/850/422eaefd-49a3-4cf6-ae04-e071d5d4b4c1/640/422eaefd-49a3-4cf6-ae04-e071d5d4b4c1.png "Hbf4r")
![[Solved] 3 . 7.1) When gamma-pyrone is treated with the strong acid ...](https://mavink.com/images/loadingwhitetransparent.gif "Hbf4r")
2, [1⁰-H⁺]BF4 and [CdCl2(1⁰)]. a ...](https://www.researchgate.net/publication/295903524/figure/fig1/AS:11431281184098459@1693229590056/Path-for-the-synthesis-of-1BF42-1-HBF4-and-CdCl21-a-from-ref-21-b_Q640.jpg "Hbf4r")
![Scheme 1. C–O bond formation with HBF4 at room temperature.[a] dr ...](https://www.researchgate.net/publication/283971632/figure/fig5/AS:296597670907916@1447725803616/Scheme1-C-O-bond-formation-with-HBF4-at-room-temperaturea-dr-diastereoisomeric_Q640.jpg "Hbf4r")
![Scheme 3. C–N bond formation with HBF4 at room temperature.[a] [a ...](https://www.researchgate.net/publication/283971632/figure/fig1/AS:296597662519310@1447725801674/Scheme3-C-N-bond-formation-with-HBF4-at-room-temperaturea-a-Isolated-yields-1H-NMR_Q640.jpg "Hbf4r")
![Palladium(II) acetate - Pd(OAc)2, [Pd(OAc)2]3](https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/structures/508/249/99a0ef2c-b77c-4d73-8ed9-0cca05b6b41f/640/99a0ef2c-b77c-4d73-8ed9-0cca05b6b41f.png "Hbf4r")
![Scheme 2. HBF4-catalysed dimerisation of propargylic alcohols.[a] dr ...](https://www.researchgate.net/publication/283971632/figure/fig6/AS:296597679296522@1447725805681/Scheme5-Undesired-reactions-of-indoles-in-acetone-Isolated-yields-are-provided_Q320.jpg "Hbf4r")
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