Due to a scarcity of thermochemical data for HHCs in the literature, a new dataset, enum-halocarb4, was compiled in this work. In order to obtain high coverage and diversity of CHO-(F,Cl,Br) chemical space, this dataset was created by "halogenating" a systematically enumerated set of over 600 CHO species containing up to 4 heavy atoms generated by Margraf et al. This "halogenating" process involved systematic substitutions of halogen atoms (F,Cl,Br) for hydrogens using RDKit. Molecules that contain more than one halogen element (CF 3 Br for example) are referred to as "mixed-halogens" and molecules with only a single halogen element (CF 4 for example) are called "mono-halogens". To reduce the size of the dataset, enum-halocarb4 was pruned by removing: