S. Ait-mohand et al., Palladium-catalyzed oxidations: Inhibition of a Pd-H elimination by coordination of a remote carbon-carbon double bond, ORGANOMETAL, 20(8), 2001, pp. 1683-1686
Under oxidative conditions that use an anionic palladium salt as catalyst,
cis-endo-2,3-bis(hydroxymethyl)bicyclo[2.2.1]hept-5-ene affords the corresp
onding exo-lactol, while cis-endo-2,3-bis(hydroxymethyl)bicyclo[2.2.1]hepta
ne provides the expected Lactone. Mechanistic considerations explain hero t
he presence of the C=C bond blocks the oxidation at the lactol in the first
case.