Synthesis Workshop: High-valent Bismuth Redox Catalysis with Dr. Oriol Planas (Episode 36)

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In this Research Spotlight episode, we are joined by Dr. Oriol Planas, who takes us through his work in the area of bismuth catalysis!

Parent references:
Science 2020, 367, 313-317.
J. Am. Chem. Soc. 2020, 142, 11382-11387.
For footnotes, see references.

Other references (in order of appearance):
For a highlight on the benign properties of bismuth, see Nat. Chem. 2010, 2, 336.
For Bismuth in organic chemistry, see: Bismuth-Mediated Organic Reactions. (Springer, Heidelberg, 2012).
For main group redox processes, see: ChemCatChem, 2018, 10, 4213; Science 2019, 363, 479.
For pioneering work of Suzuki and co-workers on sulfone-based bismacycles, see: J. Chem. Soc., Perkin Trans. 1, 1992, 1593.
For a catalytic fluorination of organoboron compounds through SET process, see: J. Am. Chem. Soc. 2013, 135, 14012-14015.
For mechanistic considerations of negative entropies, see: Chem. Sci. 2012, 3, 72.; Inorg. Chem. 1998, 37, 3975.
For transmetallation studies to Bi(III) centers, see: Organometallics 2007, 26, 6864; Nat. Chem. 2020, 12, 260.
For pioneer studies on Bi-mediated C-O bond formation, see: Chem. Lett. 2007, 36, 928.
For studies on effects of molecular sieves in catalysis, see: J. Org. Chem. 2006, 71, 1861; Chem. Rev. 2019, 119, 12491.
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Really nice and interesting use of bismuth for fluorination!

XxCALUMxX
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the change from the sulfone to the e poor sulfonimine seems to have been very important for distinguishing this catalyst from previous bismuth complexes that were previously known but did not perform as well.

what drove the decision to make this change? were you intentionally seeking to modulate the lewis basicity of the sulfone?

reminds me of how monocoordinated acetate ligands can become dicoordinated to support the dissociation of another ligand, very very cool! really loved the detailed NMR studies too

ozonefreak
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Have you considered using 2nd oranometalic coupling partner to form C-C bond?

wosmahl
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Why would someone want to use arylboronic acids to make simple triflates, if you can make them simply from phenols for example ??

mrx
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Why we are using 2, 6 di chloro pyridine at here why don't used pyridine?

arvindyadav
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17 minutes 😨 that's too long!
but very information packed

JustinKoenigSilica