| abstract |
WHEREIN X'' IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, LOWER ALKYL AND PHENYL LOWER ALKYL, R'' is selected from the group consisting of hydrogen, lower alkyl, phenyl, phenyl lower alkyl, lower alkyl phenyl, and Z'' is selected from the group consisting of amino and tritylamino. These compounds are useful as intermediates in the preparation of cephalosporin compounds. A 1,3-thiazine compound having the formula |