Abstract

The reaction with CO of the six-membered cyclometallated derivatives (L)MCl (2, M = Pd, 3, M = Pt; LH = 6-(1-methylbenzyl)-2,2′-bipyridine), and that of the solvato complexes [(L)M(S)][(BF₄], (S = acetone; 4, M = Pd; 5, M = Pt), have been investigated at atmospheric and high pressure (80–90 atm). At atmospheric pressure the complexes 2 and 3 do not react with CO, whereas the cationic derivatives 4 and 5 afford [(L)M(CO)]⁺ species (6, M = Pd; 7, M = Pt), containing terminal CO ligands. Under higher pressure the palladium complex 2 gives a labile seven-membered acyl derivative, 9, which either affords a benzoquinolizinone, 11, in the presence of ethanol or undergoes reversible decarbonylation when the CO pressure is released. The platinum complex 3 undergoes reversible coordination of a carbonyl ligand, with no insertion of CO into the platinum---carbon bond.

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