1: 2-methyl-2-propenoic acid With potassium hydroxide in toluene 2: (chloromethyl)trimethoxysilane With 4,4'-bismethylene(2,6-di-tert-butylphenol); tetra-n-butyl phosphonium chloride in toluene; butanone T=110°C; 4 h;

1,1-bis (3,5-di-t-butyl-4-hydroxyphenyl)-methane

1: With acetic acid; trifluorormethanesulfonic acid T=45°C; 2 h; 2: With acetyl chloride T=40°C; 0.333333 h; 3: With 1,1,1,3,3,3-hexamethyl-disilazane