While an increasing number of (hexacarbonyldicobalt) alkynes have been found to possess antiproliferative activity against a number of cancer cell lines, the role of the organometallic moiety in this bioactivity is not well understood. To gain a better understanding of cobalt's role in the medicinal chemistry of these compounds, several simplified analogs of a known organocobalt anticancer compound were synthesized and assessed for antiproliferative ...