1: With pyridinium p-toluenesulfonate in 1,2-dichloro-ethane T=80°C; 20 h; 2: With triethylamine in dichloromethane T=20°C; 6 h; 3: With trifluoroacetic acid in methanol; dichloromethane T=140°C; 0.0666667 h; microwave irradiation; Further stages.;

peracetic acid; 2,4-dimethylpentane-2,4-diol cyclic chromate in tetrachloromethane; dichloromethane T=0°C; 0.3 h;

3,3-dimethyldioxirane in acetone T=20°C; 2 h; Yield givenYields of byproduct given. Title compound not separated from byproducts;

1: Zn-Cu 2: CrO3, H2SO4 / acetone View Scheme

(i) NaH, toluene, (ii) /BRN= 385801/; Multistep reaction;