Novel arene chromium carbonyl complexed mustard agents have been prepa
red. The metal carbonyl group modulates mustard alkylative ability as
evidenced by 4-NBP assay. Antitumor evaluation against the human colon
tumor line HCT-116 however showed no clear correlation between alkyla
tive ability and antitumor activity of the mustard agents, in part a c
onsequence of the inherent cytotoxicity of the metal carbonyl group in
this screen.