text: 1,3-Propanedithiol reacts with metal ions to form chelate rings.  Illustrative is the synthesis of the derivative diiron propanedithiolate hexacarbonyl upon reaction with triiron dodecacarbonyl:
  :Fe(CO) +  CH(SH)  →   Fe(SCH)(CO)  +  H  +  Fe(CO)  +  CO