Treatment of 2,7,7-trimethyl-3,8-dioxatricyclo[3.2.1.02,4]octane 5 and derivatives with BF3 gave the corresponding 4,4,5-trimethyl-3,4-dihydro-2H-pyran-2-carbaldehyde 7 and traces only of 3,5,5-trimethyl-7-oxabicyclo[2.2.1]-heptan-2-one 8.
G. P. Moss and C. K. Ooi, J. Chem. Soc., Chem. Commun., 1992, 342 DOI: 10.1039/C39920000342
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