hydrogenchloride; phosphoric acid; acetic acid in 1,4-dioxane T=80°C; 36 h;

chloromethylation;

in tetrahydrofuran; anhydrous butyl ether dissolution of ligand and Cr(CO)6 in a mixt. of butyl ether and THF, heating at 130°C for 24 h under N2, monitoring by IR; concn. under reduced pressure, addn. of hexane, column chromy., elution with n-hexane/CH2Cl2, column chromy., elution with benzene under N2, elem. anal.;

N-bromosuccinmide in butanone