Synthesis, characterization, and exchange of complexes of ( R )- N , N -dimethylaminoethylferrocene with SO 2 and BF 3

Sulfur dioxide and (R)-N,N-dimethylaminoethylferrocene (I) react with an enthalpy of formation of 21.5 ± 1 kcal mol −1 to give a complex with sulfur bonded to nitrogen. The SO 2 exchanges between adduct molecules by a dissociation mechanism. BF 3 reacts with the above amine to give an adduct and its partly hydrolyzed product, [(η 5 -C 5 H 5 )Fe(η 5 -C 5 H 4 —CH(CH 3 )N(CH 3 ) 2 •BF(OH) 2 ] (II). II crystallizes in the orthorhombic space group P2 1 2 1 2 1 with a = 9.882(3), b = 10.625(5), and c = 13.988(13) Å and z = 4. R f = 0.102 and R w = 0.104. Keywords: N,N-dimethylaminoethylferrocene complexes, X-ray structure, NMR exchange.