Chemically induced dynamic polarisation of 19F-nuclei during reactions at chiral centres; the benzylic insertion of diphenylmethylene into diastereoisomeric 1-methylheptyl α-fluorophenylacetates

Abstract

Polarisation of ¹⁹F-nuclei during the insertion of triplet diphenylmethylene into the benzylic C–H bond of individual, optically active, diastereoisomeric 1-methyl-heptyl α-fluorophenylacetates appears equally in both diastereoisomeric products, indicating that the radical pairs giving rise to CIDNP show no stereochemical preference in their combination.