“…Currently, only vanillin can be produced via a commercial process by oxidation of lignosulfonates, a byproduct from the sulfite pulping industry [121,122,123]. Recently, new chemical and biotechnological approaches for the production of vanillin are studied [23,120,124,125,126]. Starting from vanillin, many biobased aromatic monomers for polyester synthesis can be produced, for example, vanillic acid, divanillyl diol, dimethyl divanillate, and so on [127,128,129,130,131].…”