Application Precatalysts for Asymmetric and Cross-Coupling Catalysis Bis(norbornadiene)rhodium(I) tetrafluoroborate can be used as a catalyst for the synthesis of: • Lactones via the 1,4-addition of arylboronic acids to butenolide. • Chiral β-aryl-substituted ketones and esters. • β-aryloxycarboxylic esters from β-aryloxy-α,γ-unsaturated esters. Product class M-C, Homogeneous Catalysts, Diene/Dienyl Ligands Reaction type Hydrogenation, Asymmetric Reactions, CH-Activation, Asymmetric Hydrogenation, Isomerization Chemical properties Chemical formula C 1 4 H 16 BF 4 Rh Empirical formula [Rh(nbd) 2 ]BF 4 Molecular weight 373.99 Metal Rh Theoretical metal content 28 Physical state powder Color red Metal purity 99.95