boron tribromide in dichloromethane 2 h;

1: 83 percent / Mg / tetrahydrofuran / 2 h / Heating 2: 94 percent / BBr3 / CH2Cl2 / 2 h View Scheme

byproducts: isobutan, boron hydride; High Pressure; under N2; diborane and trihalogen-borane was added to t-butylbenzene at-130°C, then in a closed autoclave the mixture was heated to 130°C for 40 min; at -195.8°C H2 was removed, at room temp. the residue of trihalogen-borane and diborane were removed, unseparable isomers; elem. anal.;