... %, BAR (benzylidene acetone), imidazole, OCBA (O-chlorobenzaldehyde)2) Fine specialty chemicals:a) Hypophosphorous acid (CAS no.: 6303-21-5)b) 2 ... ,3 propane sultone (CAS no.: 1120-71-4)3) Perfluoro chemicals:a) N-ethyl perfluorooctylsulfonamide (sulfluramid, CAS no.: 4151-50-2 ...