Abstract
AbstractThe reaction of (dibromoboryl)ferrocene (1a) with pyrazole/NEt3 gave the ferrocenyltri‐1‐pyrazolylborate ligand 2. Its thallium(I) derivative 2‐Tl provides the first example of a polymeric structure with bridging tri‐1‐pyrazolylborate units in the solid state. The trinuclear iron complex 2‐Fe, which is related to 1,1′‐terferrocene, was obtained by reaction of 2 with FeCl2. The bis(polydentate) ligand 1,1′‐ferrocenediyl‐bis(tri‐1‐pyrazolylborate) (3‐Li) was prepared from 1,1′‐bis‐[bis(dimethylamino)boryl]ferrocene (1c) and a mixture of lithium pyrazolide/pyrazole in refluxing toluene/THF. 3‐Li reacts with TlNO3 to give the thallium(I) complex 3‐Tl.
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