A Diels–Alder reaction employing terpenes for rapid synthesis of monomer libraries under flow conditions is presented.

The synthesis and characterization of a new 5-(Hydroxymethyl)furfural-based resin was evaluated. The product obtained, a dark brownish solid and insolluble in several organic solvents and water, presents acidic properties (-COOH). The characterization was performed by using FTIR, solid carbon NMR, TGA, DSC analyses and the results showed an amorphous material. Its acidity was explored in an organic reaction under continuous flow conditions.

The synthesis of monomers for the production of novel green polymers was evaluated in continuous flow conditions using terpenes as dienes and maleic anhydride as dienophile for the [4+2] Diels-Alder cycloaddition reaction. The hydrogenation reaction was also evaluated to prevent the retro-Diels-Alder and to expand the reactional scope by producing adducts with distinct characteristics of structures and reactivity. Fourteen different monomers were obtained in good yields in flow regime.