1: 1-chloro-4-bromobenzene With magnesium in tetrahydrofuran 2: With tributoxyborane in tetrahydrofuran; diethyl ether T=-60 - 20°C; 10 h; 3: ethanolamine T=20°C; 2 h;

in ethanol equimol. amts. of borate and borane were dissolved in EtOH under heating; cooled, crystals of diphenylborate were collected, mother liquor was evapd. to give bis(4-chlorophenyl)borane; both products were identified by m.p. and IR;

Behandeln des Reaktionsprodukts mit wss.HCl und mit 2-Amino-aethanol;

(i) Ph2NBCl2, Et2O, benzene, (ii) aq. HCl, (iii) /BRN= 505944/, H2O; Multistep reaction;