TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The composition comprises 1,3,3,3-tetrafluoropropene (HFC-1234ze), and a compound chosen from 2,3,3,3-tetrafluoropropene (HFC-1234yf), 1,2,3,3-tetrafluoropropene (HFC-1234ye), 3,3,3-trifluoropropene (HFC-1243zf), difluoromethane (HFC-32), pentafluoroethane (HFC-125), 1,1,2,2-tetrafluoroethane (HFC-134), 1,1,1,2-tetrafluoroethane (HFC-134a), 1,1,1-trifluoroethane (HFC-143a), 1,1-difluoroethane (HFC-152a), fluoroethane (HFC-161), 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea), 1,1,1,2,3,3-hexafluoropropane (HFC-236ea), 1,1,1,3,3,3-tetrafluoroethane (HFC-236fa), 1,1,1,3,3-pentafluoropropane (HFC-245fa), 1,1,1,3,3-pentafluorobutane (HFC-365mfc), propane, n-butane, isobutane, 2-methylbutane, n-pentane, cyclopentane, dimethylether, bis(trifluoromethyl)sulfide, carbon dioxide, ammonia, and iodofluoromethane, and/or 2,3,3,3-tetrafluoropropene (HFC-1234yf), and a compound chosen from 1,2,3,3-tetrafluoropropene (HFC-1234ye), 3,3,3-trifluoropropene (HFC-1243zf), difluoromethane (HFC-32), pentafluoroethane (HFC-125), 1,1,2,2-tetrafluoroethane (HFC-134), 1,1,1,2-tetrafluoroethane (HFC-134a), 1,1,1-trifluoroethane (HFC-143a), 1,1-difluoroethane (HFC-152a), fluoroethane (HFC-161), 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea), 1,1,1,2,3,3-hexafluoropropane (HFC-236ea), 1,1,1,3,3,3-tetrafluoroethane (HFC-236fa), 1,1,1,3,3-pentafluoropropane (HFC-245fa), 1,1,1,3,3-pentafluorobutane (HFC-365mfc), propane, n-butane, isobutane, 2-methylbutane, n-pentane, cyclopentane, dimethylether, bis(trifluoromethyl)sulfide, carbon dioxide, ammonia, and iodofluoromethane. The composition alternately comprises 1,2,3,3-tetrafluoropropene (HFC-1234ye), and a compound chosen from 3,3,3-trifluoropropene (HFC-1243zf), difluoromethane (HFC-32), pentafluoroethane (HFC-125), 1,1,2,2-tetrafluoroethane (HFC-134), 1,1,1,2-tetrafluoroethane (HFC-134a), 1,1,1-trifluoroethane (HFC-143a), 1,1-difluoroethane (HFC-152a), fluoroethane (HFC-161), 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea), 1,1,1,2,3,3-hexafluoropropane (HFC-236ea), 1,1,1,3,3,3-tetrafluoroethane (HFC-236fa), 1,1,1,3,3-pentafluoropropane (HFC-245fa), 1,1,1,3,3-pentafluorobutane (HFC-365mfc), propane, n-butane, isobutane, 2-methylbutane, n-pentane, cyclopentane, dimethylether, bis(trifluoromethyl)sulfide, carbon dioxide, ammonia, and iodofluoromethane, and/or 3,3,3-trifluoropropene (HFC-1243zf), and a compound chosen from difluoromethane (HFC-32), pentafluoroethane (HFC-125), 1,1,2,2-tetrafluoroethane (HFC-134), 1,1,1,2-tetrafluoroethane (HFC-134a), 1,1,1-trifluoroethane (HFC-143a), 1,1-difluoroethane (HFC-152a), fluoroethane (HFC-161), 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea), 1,1,1,2,3,3-hexafluoropropane (HFC-236ea), 1,1,1,3,3,3-tetrafluoroethane (HFC-236fa), 1,1,1,3,3-pentafluoropropane (HFC-245fa), 1,1,1,3,3-pentafluorobutane (HFC-365mfc), propane, n-butane, isobutane, 2-methylbutane, n-pentane, cyclopentane, dimethylether, bis(trifluoromethyl)sulfide, carbon dioxide, ammonia, and iodofluoromethane.