The use of Co(tetraphenylporphyrins), carrying methoxy substituents in the meso-phenyl groups, in aerobic, quinone-free palladium-catalysed 1,4-oxidations of cyclohexa-1,3-diene provides an entry to cis-disubstituted products, until now inaccessible by aerobic procedures.
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Grennberg et al. (1993) studied this question.
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