in hydrogen bromide oxide dissoln. in dil HBr (1:3), soln. evapn. until crystn. occured; crystals sepn. from mother liquor, drying (vac. desiccator, over CaCl2, P2O5 and alkali) to const. mass;

in inert gas at 200-400°C; quant. reaction requires a fourfold excess of NH4Br;

in hydrogen bromide aq. HBr; 48 percent aq. HBr; purifn. by subl.;

aluminium in solid liquid Br2 was dropped into a solid mixt. of oxide and a large excess ofAl powder in one-end sealed quartz tube under Ar atm., evacuated, seale d, placed in a tabular furnace with temp. gradient from 750 to 460 K;

aluminium in solid Ln2O3, AlBr3 (Ln:Al = 1:4) and Al powder were placed into an one-end sealed quartz tube under Ar, sealed under vac., heated at 600 K for 1 h; sealed tube was placed in a tubular furnace with a reduced temp. gradient from 750 to 460 K, vapor transport reaction for 6 h, tube was quickly removed from the furnace, the hot end was quenched with water, AlBr3 wascondensed;

in neat (no solvent) oxide to bromide 1:6, 1st annealing step (440°C), 2nd annealing step (850°C); elem. anal.;

La2O3 and BBr3 (molar ratio 1:2) heated in sealed ampoule at 300-330°C (12 h);

byproducts: CO2, C; 3-fold excess of CBr4; 400-600°C, 4-5 h; further by-product: La oxide bromide;

sulfur introducing a vapor of a soln. of S in Br2 over La oxide;

in hydrogen bromide aq. HBr; dissolving of La-oxide in concd. HBr, addn. of bromide; evapn., heating up to 570°C (vac.), then up to 650°C, melting (1100 K), distn. (0.1 Pa, 1150 K);