The orange liquid B,H,Fe(CO), has been prepared by direct reaction of pentaborane(9) with iron pentacarbonyl and also by the reaction of tetraborane( 10) with enneacarbonyldi-iron ; spectroscopic evidence shows that the Fe(CO), group has replaced the apex BH group in BSHQ and that the compound has structural and bonding affinities with C4H4Fe(CO), and C[Fe(C0),ls.

Die Nitrose‐Komplexe (I) reagieren mit Silbertetrafluoroborat (II) und Acetonitril (III) zu den Komplexen (IV), deren Acetonitril‐Liganden in stereospezifischer Weise durch Trideuteroacetonitril ausgetauscht werden.

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