Ag. Tolstikov et al., CHIRAL ORGANOPHOSPHORUS LIGANDS DERIVED FROM THE LEVOPIMARIC ACID-MALEIC ANHYDRIDE ADDUCT, Mendeleev communications, (6), 1996, pp. 215-217
The levopimaric acid-maleic anhydride adduct 1 has been used as a star
ting compound to synthesize chiral organophosphorus ligands 11-13 and
15-17 for transition metal complexes.