NarrowH OMO-LUMO gaps and high chargecarrier mobilities make larger acenes potentially high-efficient materials for organic electronic applications.The performance of such molecules was shown to significantly increase with increasing number of fused benzene rings.B ulk quantities, however,c an only be obtained reliably for acenes up to heptacene.T heoretically,(oligo)acenes and (poly)acenes are predicted to have open-shell singlet biradical and polyradical ground states,respectively,for which experimental evidence is still scarce.W eh ave nowb een able to dramatically lower the HOMO-LUMO gap of acenes without the necessity of unfavorable elongation of their conjugated p system, by incorporating two boron atoms into the anthracene skeleton. Stabilizing the boron centers with cyclic (alkyl)-(amino)carbenes gives neutral 9,10-diboraanthracenes,w hich are shown to feature disjointed, open-shell singlet biradical ground states.