2-Disubstituted acetic acids and their halides, anhydrides, activated esters, activated amides and salts

摘要

The novel 2-disubstituted acetic acids correspond to the formula <IMAGE> In formula III, R<1> and R<2> have the meanings given in Claim 1. The acid halides, acid anhydrides, lower alkyl esters, certain activated esters, certain activated amides and the salts of the compounds of the formula I are also novel. The compounds of the formula I can be used to prepare cephalosporin compounds having an antibacterial action.