Reversible CO2 Addition to a Si=O Bond and Synthesis of a Persistent SiO2 -CO2 Cycloadduct Stabilized by a Lewis Donor-Acceptor Ligand.
Angew Chem Int Ed Engl
; 57(10): 2635-2638, 2018 03 01.
Article
em En
| MEDLINE
| ID: mdl-29336108
ABSTRACT
The donor-stabilized sila-ß-lactone 1 reacts with CO2 via a remarkable reversible [2+2]-cycloaddition reaction to form the spiro-cyclic silicon carbonate derivative 2. Furthermore, photolysis of 2 under pressure of CO2 affords the first persistent SiO2 -CO2 cycloadduct 3, presenting a Si2 O4 -like structure, which is stabilized by a Lewis donor-acceptor type ligand. As predicted by theoretical calculations, in marked contrast to the thermodynamically stable SiO2 dimer, the SiO2 -CO2 mixed cycloadduct 3 is labile and readily releases CO2 .
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MEDLINE
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En
Ano de publicação:
2018
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Article