Isolation, characterization and resolution of 1,3,5,7-tetramethyl-2,6,9-trioxo-bicyclo[3.3.1]nona-3,7-diene

1,3,5,7-Tetramethyl-2,6,9-trioxo-bicyclo[3.3.1]nona-3,7-diene, a dimer of acetylacetone which is formed as a coordinated species through a Pt(II) promoted {A figure is presented} condensation, can be displaced from the complex by sodium cyanide treatment. This new compound forms stable chelate π-complexes with Pd(II) and Rh(I) and has been resolved into optical isomers by fractional crystallization of a diastereoisomeric Rh(I) complex. © 1977.