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Isomerization of alfa-pinene oxide in the presence of indenyl allyl dicarbonyl molybdenum(II) and tungsten(II) complexes
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The indenyl complexes IndM(η3-C3H5)(CO)2 (M=Mo (1), W (2)), (IndMe)Mo(η3-C3H5)(CO)2 (3) and
(IndSiMe3)Mo(η3-C3H5)(CO)2 (4) display catalytic activity for the isomerisation of α-pinene oxide. Conversion
reached 97% after 3 h at 35 °C in the presence of 1 and 1,2-dichloroethane as solvent, giving campholenic
aldehyde in 56% yield. Solvent polarity and basicity appear to affect the reaction rate. Whereas the type of
substituent on the indenyl ligand does not appear to have a strong impact on catalytic performance, changing
the metal centre from Mo (1) toW(2) gave a significantly more active catalyst.
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Bruno, S., Gamelas, C., Gomes, A., Valente, A., Pillinger, M., Romão, C. & Gonçalves, I. (2012). Isomerization of alfa-pinene oxide in the presence of indenyl allyl dicarbonyl molybdenum(II) and tungsten(II) complexes. Catalysis Communications, 23, pp. 58-61. doi: 10.1016/j.catcom.2012.03.006