Al III-Catalysed Formation of Poly(limonene)carbonate: DFT Analysis of the Origin of Stereoregularity

Abstract

<p> Amino-triphenolate derived Al(III) complexes combined with suitable nucleophiles have been investigated as binary catalysts for the coupling of limonene oxide and carbon dioxide to afford alternating polycarbonates. These catalysts are able to produce stereo-regular, perfectly alternating <em>trans</em>-polymers from <em>cis</em>-limonene oxide, whereas the pure <em>trans</em> isomer and <em>cis</em>/<em>trans</em> mixture give rise to lower degrees of stereo-regularity. The best Al(III) catalyst shows the potential to mediate the conversion of both stereo-isomers of limonene oxide with high conversion levels of up to 71% under neat conditions indicating a high robustness and atom-efficiency of this catalytic process. Computational studies have revealed unique features of the binary catalyst system among which is the preferred nucleophilic attack on the quaternary carbon centre in the limonene oxide substrate.</p>