Kikuchi S1, Sekine K, Ishida T, Yamada T.
Angew Chem Int Ed Engl. 2012 Jul 9;51(28):6989-92. doi: 10.1002/anie.201201399. Epub 2012 Jun 4.A catalytic amount of silver benzoate with 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene (MTBD) was an effective catalytic system for the reaction of carbon dioxide with various ketones containing an alkyne group at an appropriate position. These reactions afforded the corresponding γ-lactone derivatives in good to high yields under mild conditions.Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.