This brief excursion into the reactivities of CS2, CO 2, and COS towards transition metals demonstrates the diversity of the individual chemistries. Although. CS2 is a very reactive molecule, CO2 is not. Cleavage of the C-O bond in CO2 78 and the C-S bond in CS2 play only minor roles in the chemistries, whereas C-S bond cleavage in COS is the important aspect of the chemistry. Thus far, the study of COS chemistry has not proved directly helpful in the activation of CO2. Nor has the use of liquid CO2 led to new, stable CO2 complexes. Yet COS chemistry has proved to be interesting and diverse in its own right, with potential applications to carbonylation reactions. And the use of liquid CO2 has proved to be valuable as a screening technique for reactivity of transition-metal systems towards CO2. The chemistry of these molecules is in an early stage of development. Much remains to be explored, including a wider range of transition metals, kinetics and mechanisms of the reactions, and theoretical studies of the bonding. I am optimistic that the increased interest in this area, engendered in part by the potential utilization of CO2 as a source for C1 chemistry, will lead to rapid development of the chemistry of these fascinating molecules.
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