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.