... Chem. ... Gerrit L'abbb,* Guido Vermeulen, Jacques Flbmal, and Suzanne Toppet Department of Chemistry, University of Leuven, Celestijnenluun 200F, 3030 Heverlee ... of the ortho phenyl carbon absorption in compounds 3a,c,e. Ac- cording to Begtrup' the chemical shift value of ...