... Chern. 335 (1993) 128- 134 Journal fur praktische Chemie C hemi ker -Zeitung 0 Johann Ambrosius Barth 1993 ... Chem. 335 (1993) CI ... The chloro atoms in the dichloromethyl group range in their reactivity between the two ring chloro atoms in positions 2 and 4 of the ring system. ...