[DE] VERFAHREN ZUR HERSTELLUNG VON 5-BROM-3,3-DIMETHYL-2,3-DIHYDRO-1H-INDOL, HYDROCHLORID [EN] METHOD FOR PRODUCING 5-BROMO-3,3-DIMETHYL-2,3-DIHYDRO-1H-INDOLE HYDROCHLORIDE [FR] PROCEDE DE PREPARATION D'HYDROCHLORURE DE 5-BROME-3,3-DIMETHYL-2,3-DIHYDRO-1 H -INDOL