| 摘要 |
<p>Azetidinone mercury sulfides of formula …<CHEM>… wherein… n is 0 or 1,… X is chloro or bromo, and… R is hydrogen or a carboxylic acid ester protecting group, are prepared by the reaction of penicillin derived thiazoline-azetidinones of formula …<CHEM>… with a mercuric halide in the presence of an alcohol or glycol. They are useful intermediates in the preparation of cephalosporin compounds.</p> |
