Moreover, this process is safe, scalable, and highly modular. Substituted benzyne precursors yield monomers with a host of functionalities that may alter the properties of polymers generated downstream. The monomer's substitution pattern also influences its physical properties with ramifications for the processing conditions employed in FROMP, for example, liquid resins are necessary to reactive processing such as DIW. The parent HEN monomer (3a) is solid at room temperature, whereas methyl-or chloro-substituted monomers (4a, 3b, and 3c) are liquids. Moreover, many of the substituted HEN monomers exist as racemic mixtures of enantiomers (4a, 3b, and 3c) or constitutional isomers (4b and 4c). While previous studies from our group demonstrated that the monomer isomer identity influences the resultant polymer properties, we wanted to assess the reactivity of the HEN-type monomers as prepared without laborious isomer separation.