1H,3H-Benzo[1,2-c:4,5-c']difuran-1,3,5,7-tetrone, reaction products with 4,4'-[[1,1'-biphenyl]-2,5-diylbis(oxy)]bis[benzenamine], Et alc., 3,3'-[1,3-phenylenebis(oxy)]bis[benzenamine] and 5-(2-phenylethynyl)-1,3-isobenzofurandione