1-hydroxy-4,4-dimethyl-1,1-diphenyl-pentan-3-one

(3-tert-butyl-2,2-diphenyloxetan-3-yl)oxy-trimethylsilane

2,2-diphenyl-3-propan-2-yloxetan-3-ol

3-cyclopropyl-2,2-diphenyloxetan-3-ol

3-tert-butyl-2,2-diphenyloxetan-3-ol