Synthesis and characterization of Nb(OR)4[OC(O)OR] (R = Me, Et, Allyl) and their reaction with the parent alcohol to afford organic carbonates.
Nb(OR)(4)[OC(O)OR] (R = Me, Et, allyl) compounds have been synthesized by the reaction of dimeric alkoxo complexes [Nb(OR)(5)](2) with CO(2). The kinetics of the reaction has shown that the monomer in equilibrium with the dimer is the species that reacts with CO(2). The resulting compounds are monomeric with a eta(2)-O,O-bonded hemicarbonate group. The CO(2) uptake is reversible. The hemicarbonates react with the parent alcohol to afford the relevant organic carbonate (RO)(2)CO with a turnover number (TON) of >2.
Aresta
Michele
M
Department of Chemistry, University of Bari, and Centro METEA, Via Celso Ulpiani 27, Bari 70126, Italy. aresta@metea.uniba.it
Dibenedetto
Angela
A
Pastore
Carlo
C