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The reaction mixture of nickel(II) β-diketonato complex and aldehyde (pivalaldehyde or cyclohexanecarboxaldehyde) exhibits high reactivity toward tetraphenylcyclopentadienone (one of famous singlet oxygen (1Δg) scavenger), and the origin of unique reactivity of the system was discussed.
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Nishida et al. (1992) studied this question.
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