Using c1ccc([P+](c2ccccc2)(c2ccccc2)C2CCCC2)cc1, COc1ccc(Br)cc1C=O to produce COc1ccc(Br)cc1C=C1CCCC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.