... 1972. Chem.Abstr.,77, 97750 (1972) View all references , 6 6. Duerr , D. and Dittrich , V. Ciba; Patent US 3395233, NL 6604132. 1966. Chem. ... 12 12. Braverman , S. , Cherkinsky , M. and Birsa , ML 2005. Science of Synthesis, Vol. 18, 65–320. Stuttgart: Thieme. ...