Selective Palladium-Catalysed Aerobic Oxidation of Alcohols - Transition Metal Catalysis in Aerobic Alcohol Oxidation - page 97

d n 4 r 4 n g | 2

Figure 4.3 Oxidative dehydrogenation of allylic alcohols over palladium surfaces.

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Figure 4.4 Temperature-programmed C 1s XP spectra of a saturated crotyl alcohol
adlayer over Pd(111) highlighting primary dehydrogenation pathway and
competing decarbonylation.
Reprinted with permission from Ref. 46. Copyright 2007 American
Chemical Society.

temperature-programmed XPS measurements of crotyl alcohol over clean
Pd(111) 46 surfaces proved that oxidative dehydrogenation to crotonaldehyde
occurs at temperatures as low as 60 1C (Figure 4.4), with alcohol de-
hydration only a minor pathway. These ultra-high-vacuum measurements
also revealed that reactively formed crotonaldehyde undergoes a competing