9,9-Dioctylfluorene-2,7-diboronic Acid bis(Pinacol) Ester is a reactant in the synthesis of 6,6'-(5,5'-(9,9-dioctyl-9H-fluorene-2,7-diyl)bis(thiophene-5,2-diyl))bis(2,5-bis(2-ethylhexyl)-3-(thiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione) (DPP1), a solution-processable nonfullerene electron acceptor used in organic solar cells. Molecular Formula: C41H64B2O4 Molecular Weight: 642.57000000000005