Phenolic esters heating with `AlCl_(3)` (Lewis acid ) gives ortho and para acyl phenol . This is known as Fries rearrangement .
In general, low temperature favours the para product and high tempearture favaous orhto product .
If one of the ortho position is subtituted by any group then para is the major product
`overset(AlCl_(3))to ` Major product :