Crystal and molecular structure of 4-acetyl-3-methyl-7β-phenoxyacetamido-Δ3-cephem

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Abstract
The crystal structure of the title compound (4) has been determined by three-dimensional diffraction methods. Crystals are orthorhombic, space group P212121 with Z= 4, unit cell dimensions a= 23.771(7), b= 8.833(2), c= 7.943(7)Å. The structure has been solved by direct methods and refined by least-squares to R 0.051. The relevant molecular parameters are compared with those of other Δ3-cephem derivatives. In particular the same distortions of the β-lactam ring are observed; the lactam-nitrogen atom is out of the plane of its bonded carbon atoms by 0.20 Å.

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