Abstract
The direct reaction between [{Pd(μ-AcO)(CˆP)}2] 1 and cyclic imides to yield new dinuclear cyclometallated palladium(II) complexes containing –NCO– bridging imidates of general formula [{Pd(μ-NCO)(CˆP)}2] (CˆP = CH2C6H4P(o-tolyl)2; –NCO– = succinimidate (suc) 2, maleimidate (mal) 3, phthalimidate (phthal) 4 or saccharinate (sacc) 5 is described. Spectroscopic techniques and structural characterisation by X-ray diffraction of complex 2 confirmed the proposed formulae. The new dimeric complexes are shown to be excellent catalysts for the selective formylation of aryl halides under CO-free conditions to obtain synthetically important aromatic aldehydes. Yields are diminished by steric hindrance around the aryl halides.
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