Synthesis and structural characterization of the diborylated organometallics 1,3-Bis(dibromoboryl)-1′,2′,3′,4′,5′-(pentamethyl)ferrocene and 1,3-bis(dibromoboryl)cymantrene

Diborylated organometallic complexes can function as precursors for boron-bridged organometallic macromolecules. So far, mainly ferrocenylborane polymers featuring a 1,1'-connectivity pattern have been prepared from 1,1'-bis(dibromoboryl)ferrocene. In this paper we present the optimized synthesis protocols for 1,3-bis(dibromoboryl)-1',2',3',4',5'-(pentamethyl)ferrocene and 1,3-bis(dibromoboryl)cymantrene. Both compounds have been fully characterized by NMR spectroscopy as well as X-ray diffraction techniques and possess promising potential for the preparation of boron-bridged polymers with a 1,3-connectivity pattern.