358978-95-7Relevant academic research and scientific papers
Cationic complexes of palladium(II) and platinum(II) as Lewis acid catalysts for the Diels-Alder reaction
Pignat, Kristian,Strukul, Giorgio
, p. 5160 - 5167 (2000)
The synthesis of a series of Pd(II) and Pt(II) cationic complexes of the types [(P-P)M(solv)](Y)2, [(P-P)M(η2-Y)](Y), and [(P-P)M(μ-Cl)]2(Y)2 (where P-P = various diphosphines including chiral diphosphines (M = Pd, Pt; Y = TfO-, ClO4-, BF4-) is reported. All complexes are excellent catalysts for the Diels-Alder reaction between cyclopentadiene or cyclohexadiene and a number of simple dienophiles such as acrolein, methacrolein, and methylvinyl ketone. Some of the complexes modified with chiral diphosphines can act as enantioselective catalysts in the Diels-Alder reaction under mild condition with moderate ee's. A critical point in this respect is the presence of only one vacant coordination site in the catalyst.
