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A palladium(II)-catalysed intramolecular oxidative C-H/C-H cross-coupling of N'-methylenebenzohydrazides to phthalazin-1(2H)-ones has been developed. This cyclization is believed to mechanistically proceed via electrophilic ortho-palladation and subsequent C-arylation of the carbon-nitrogen double bond.
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Matsuda et al. (2013) studied this question.
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