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Scheldt et al.bridging carbonyl ligands is observed. This aspect is being investigated further.It is anticipated that the study of "A-frame" complexes and their chemistries with small unsaturated molecules will, in addition to yielding a great deal of interesting and varied chemistry, be of tremendous value in furthering the understanding of catalytic processes involving multicentered metal catalysts.

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We successfully synthesized a novel P-chirogenic diaminophosphine oxide 4, which was applied to catalytic enantioselective construction of quaternary carbon centers using Pd-catalyzed asymmetric allylic substitution with various beta-keto esters (up to 99% yield, 94% ee). Preliminary mechanistic studies indicated that two molecules of 8 coordinate to the Pd metal in a monodentate fashion, resulting in the formation of Pd complex 9 (Pd:8 = 1:2), which functions as the active species.