Popis: |
A series of microporous metal-organic frameworks, NIIC-10, based on 2,5-thiophendicarboxylate (tdc2–), 1,4-diazabicyclo[2.2.2]octane (dabco), polyol ligands and Zn-ions were investigated in carboxylation of mono-, di and tri-substituted epoxides in the presence of tetrabuthylammonium bromide (TBAB). Reactions were carried out in solventless media under CO2 atmosphere and 80°C. All resulting mono- and disubstituted cyclic carbonates were obtained in good to excellent yields. Furthermore, the catalyst also showed good selectivity and recyclability for five cycles without a significant loss of activity. |