2,2′-P-phenylenebis(4-methyl-5-phenyloxazole) and other solutes for scintillation counting †

The advent of large liquid scintillation counters has created a need for a secondary solute which is more soluble in organic solvents than is 2,2′-p-phenylenebis(5-phenyl-oxazole) (POPOP, I or II, R-substituents = H), the preferred secondary solute for small-scale work.