Azetidinone of derivatives and process for their preparation

RESPECT THE INVENTION OF DERIVATIVES azetidinone A PROCESS FOR THEIR PREPARATION THESE DERIVATIVES ARE REPRESENTED BY THE FORMULA:. (CF DRAWING IN BOPI) OR R IS LOWER aLKYL sUBSTITUTED OR AN aRYL aRYLOXY, R IS LOWER aLKYL sUBSTITUTED aRYL A, A LOWER aLKYL sUBSTITUTED BY aRYLOXY OR POSSIBLY LOWER aLKYL sUBSTITUTED BY hALOGEN, R REPRESENTS: (CF DRAWING IN BOPI) (R OR IS LOWER aLKYL) (CF DRAWING IN BOPI) (R OR IS AS DEFINED ABOVE), -S-SO-R (OR R IS AN aRYL) (CF DRAWING IN BOPI) (OR R R AND ARE SIMILAR OR DIFFERENT AND rEPRESENT AN aLKYL pHENYL OR BELOW) OR (CF DRAWING IN BOPI) X AND IS HEDROGENE OR hALOGEN.