Borylborazine molecular precursors have been synthesized from B(NHiPr){sub}3 or B(NHMe){sub}3 and subsequently converted into preceramic polymers by polycondensation reactions. The latter display flexible three-atom bridges between the B{sub}3N{sub}3 rings. The isopropyl-based polymer exhibits good processing properties and continuous raw micrometric fibers could be melt-spun then converted into BN fibers by high temperature thermal treatment. These ～10 μm diameter fibers show promising mechanical properties (σ ～900 MPa and E ～ 150 GPa).
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