Oxidation of small sulfur compounds resulting from algae production are considered as a possible source of sulfate production in marine aerosols and cloud condensation nuclei and thus, may play a role in climate regulation. The S-H bonds in alkane-thiols, CH3SH and CH3CH2SH, are 87.5 and 87.6 kcal/mol, respectively, and are weaker than the C–H bond which is 94.2 kcal/mol. The thiyl radical is therefore considered a significant product in the initial reactions of sulfur hydrocarbons with OH in the chemistry of the atmosphere. The reactions of thiyl radicals with carbon monoxide are important for the coupling the chemistry of sulfur radicals with carbon oxygen compounds. The reactions in this study result in a formation path for OCS with HS• and hydrocarbon sulfur radicals: HS• + CO ↔ HSC•=O ↔ O=C=S + H or CH3S• + CO ↔ CH3SC•=O ↔ CH3 + O=C=S. Computational chemistry is used to determine the thermochemical parameters and kinetics for the above reactions under atmospheric and thermal conditions such as the Claus Process. The overall reactions are near thermo neutral with ethyl and methyl radical product sets slightly exothermic. The barriers for adduct reaction to H, CH3 and CH3CH2 + OCS appear to be rate determining under atmospheric conditions.