abstract |
The present invention relates to a process for the preparation of a compound of formula I (CF DRAWING IN BOPI) in which R1, R2, R3, R4, R5, n and Ar are as defined in claim 1, by reaction of a phenol of formula II: (CF DRAWING IN BOPI) in which R1 to R4 are as defined in claim 1 with a compound of formula III (CF DRAWING IN BOPI) in which R5, Ar, E and n are as defined to claim 1, in the presence of an acid which is derived from sulfinimide or sulfonimide. |