发现在沸腾的三氟乙酸(TFA)中发生酰基戊二甲基苯与活化的芳烃(如苯甲醚)之间的容易的转酰基作用。通过产物分离和动力学阐明了乙酰戊五甲基苯(AcPMB)和苯甲醚与TFA的转酰化机理。该反应进行经由AcPMB的可逆protodeacetylation涉及的本位-protonated中间体B,得到五甲基苯和乙三氟乙酸酐,接着通过混合酸酐苯甲醚不可逆乙酰化。从而导致该机构本位-protonated中间体B由acetylmesitylene与[反应推导2H] TFA以及3,5-二氘代乙酰基乙酰间苯三甲与TFA的脱乙酰速率。这种中间体的形成还通过在稳定离子条件下在超酸溶液中对AcPMB的13 C nmr光谱研究独立地证实。
Sterically hindered acylarenes are deacylated to arenes in good yields on heating in boiling 1,2-dichloroethane containing a catalytic amount of triflic acid and water. Hindered arenecarboxylic acids undergo decarboxylation under the same conditions to give arenes in high yields.
Sterically hindered acylarenes are deacylated to arenes in quantitative yields on heating in boiling 85% trifluoroacetic acid. Hindered arenecarboxylic acids undergo decarboxylation under the same conditions to give arenes in high yields.
Regioselective side-chain nitration of polymethylbenzenes directed by an acyl function and its application to the synthesis of polysubstituted phthalic acid derivatives