Abstract: Derivatives of formula (I) ##STR1## in which X denotes a hydrogen or halogen atom, an alkoxy radical, an alkyl radical or an allyloxy radical, and R denotes a linear or branched alkyl radical, a cycloalkylalkyl radical, an alkenyl radical, an arylalkyl radical which can bear one or more substituents chosen from halogen atoms and methyl, methoxy and methylenedioxy radicals, or alternatively an optionally substituted phenyl radical, as well as the addition salts thereof with pharmaceutically acceptable acids produce an .alpha..sub.2 -receptor antagonist effect.

Abstract: An installation for de-slagging casting ladles having a de-slagging machine comprising means for raising each ladle to be de-slagged and tilting it into an inclined de-slagging position with its opening directed downwards. Once de-slagging has been completed the raising and tilting means is used to restore the ladle to its original position. Means is provided for immobilizing the ladle in the inclined de-slagging position, as is a movable de-slagging arrangement comprising a tool-holder head, and means for rotating this head about an axis coinciding with that of the ladle in the inclined de-slagging position.