Other Applications of Hindered Phenols

6- di-tert-Butyl-4-methoxyphenyl esters have been used for stereospecific aldol reactions. Thus the threo aldol obtained from the reaction of isobutanal and 

6- di-tert-butyl-4-methoxyphenylpropionate, after acetylation was converted in acetonitrile solution with ceric ammonium nitrate during 30 mins, to the acetoxy acid which was hydrolysed with aqueous sodium hydroxide to give (2SR,3SR)-2,4-dimethyl-3-hydroxypentanoic acid (ref. 115). 

The phenol in benzene srirred with manganese dioxide on alumina at ambient temp, for 6h.to 3,5,3, 5 -tetra-tert-butylstilbene-4,4 -quinone. 

BnMejNBrj The phenol and aqueous sodim hydroxide added dichloromethane and then stirred at ambient temp, for 5h. to give 2,6,2, 6 -tetratert-butyldipheno-quinone. 

The phenol and the ehelate [N,N -bis-(2 -pyridine-carboxamido)- , 2-benzene]cobalt(II)-water in acetonitrile at ambient temp, with oxygen for for 5h. to give 2,6-di-tert-butylbenzo-l,4-quinone. 

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