Activation of Carbon Dioxide by Silyl Triflate‐Based Frustrated Lewis Pairs. Issue 37 (28th July 2015)

• Record Type: Journal Article
• Authors: Weicker, Sarah A.; Stephan, Douglas W.
• Is Part Of: Chemistry. Volume 21:Issue 37(2015)
• Page Start: 13027
• Page End: 13034
• Publication Date: 2015-07-28
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201501904
• Languages: English
• ISSNs: 0947-6539

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Silyl triflates of the form R_{4−<italic>n</italic>}Si(OTf)_{<italic>n</italic>} (<italic>n</italic>=1, 2; OTf=OSO₃CF₃) are shown to activate carbon dioxide when paired with bulky alkyl‐substituted Group 15 bases. Combinations of silyl triflates and 2, 2, 6, 6‐tetramethylpiperidine react with CO₂ to afford silyl carbamates via a frustrated Lewis pair‐type mechanism. With trialkylphosphines, the silyl triflates R₃Si(OTf) reversibly bind CO₂ affording [R′₃P(CO₂)SiR₃][OTf] whereas when Ph₂Si(OTf)₂ is used one or two molecules of CO₂ can be sequestered. The latter bis‐CO₂ product is favoured at low temperatures and by excess phosphine.</p> </abstract>