- Rh(III)-catalyzed, 1,2,3-triazole-assisted directed C–H coupling with diazo diphosphonates
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A mild and efficient procedure was developed for the [Cp?Rh(III)]-catalyzed, 1,2,3-triazole directed C–H coupling with diazomethylene-diphosphonates. This protocol provided a step- and atom-economical protocol for C–C bond formation and led to structurally diverse 2-(1,2,3-triazol-2-yl)benzyl diphosphonates in good to excellent yields.
- Yu, Zhu-Jun,Zhang, Chen,Li, Jiang-Lian,Liu, Yan-Zhao,Yu, Xin-Ling,Guo, Li,Li, Guo-Bo,Wu, Yong
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supporting information
p. 2816 - 2819
(2018/06/19)
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- Preparation of organohalosilanes
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In an industrial process for preparing organohalosilanes by reacting metallic silicon particles with an organohalide in the presence of a copper catalyst, a contact mass composed of the metallic silicon and the catalyst further contains an effective amount of a phosphine chalcogenide compound. The invention drastically increases the silane formation rate and the utilization of silicon without lowering the selectivity of useful silane.
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- Synthesis and Nuclear Magnetic Resonance Spectroscopic Studies of Alkylene / Alkylidenebis(phosphonic Dihalides) and -bis(fluorophosphoranes)
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Chlorine-fluorine exchange in the bis(phosphonic dichlorides) Cl2P(O)-X-P(O)Cl2 (1a - c) with AsF3 furnishes the bis(phosphonic difluorides) F2P(O)-X-P(O)F2 (2a - c).Reaction of 2a - c with SF4 leads to bis(tetrafluorophosphoranes) F4P-X-PF4 (3a - c) (X = CH2, CH2CH2, trans-CH=CH).Additional methods of synthesis are indicated for compound 3a (X = CH2) which are based on the cleavage of the Si-C bond with PF5 in the Si-C bonded precursors 2 and Me3SiCH2PF4.The NMR spectra of compounds 2 and 3 are discussed.
- Althoff, Wolfgang,Fild, Manfred,Schmutzler, Reinhard
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p. 1082 - 1090
(2007/10/02)
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