The synthesis of new 3-substituted 7-halocephalosporanates was described. 7-ACA was reacted with thiols at pH 6.5${sim}$6.8 to afford the 3-substituted 7-ACA (1), which was treated with diphenyldiazomethane to give diphenylmethyl 7-aminocephalosporanate (2). The Halogenation of 7-aminocephalosporanate (2) with NaNO$_2$, KBr and H$_2$SO$_4$ gave 7-bro-mocephalosporanate (3) and with NaNO$_2$, HCI gave 7-chlorocephalosporanate (4). Diphenylmethyl cephalosporanate (2${sim}$4) were deprotected by AIC1$_3$ in anisole and neutralized to give the sodium cephalosporanate (5${sim}$7).