DE844143 , ; DRP/DRBP Org.Chem. Zhurnal Obshchei Khimii, , vol. 8, p. 1353,1354, 1358 Chem. Zentralbl., , vol. 110, # II p. 3690 Zhurnal Obshchei Khimii, , vol. 2, p. 921,924 Chem. Zentralbl., , vol. 105, # I p. 215 Ullmann, , vol. 5, p. 472 Zhurnal Obshchei Khimii, , vol. 4, p. 529,534, 550 Chem. Zentralbl., , vol. 106, # II p. 514