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New Derivatives of 3 - amino - 2 - azetidinon - (1 - (2 - Halo - or 2 - acetyl haloetiliden) - acetic acid, Process for preparing them and Procedure to obtain 3 - cefem compounds from such derivatives
New Derivatives of 3 - amino - 2 - azetidinon - (1 - (2 - Halo - or 2 - acetyl haloetiliden) - acetic acid, Process for preparing them and Procedure to obtain 3 - cefem compounds from such derivatives
