Pyrazolyl derivatives of aluminium and gallium

Abstract

A series of volatile, tricyclic derivatives, [ N₂C₃H₃·MR₂]₂(where M = Al or Ga; R = H, D, Me, Et, or Cl) has been synthesised by reacting pyrazole with the appropriate aluminium or gallium precursor. The resulting dimeric compounds have been characterised by elemental analyses, molecular weight determinations, and by ¹H n.m.r. and mass spectroscopic measurements. In all cases a boat conformation for the six-membered ring of four nitrogen and two metal atoms is consistent with the experimental results.