In this context, particularly exciting applications of rAP-Kolbe reaction are facile access to unconventional polymer building blocks from abundant, biomass-derived carboxylic acids (Figure ). As mentioned earlier, undecenoic acid 37 can be efficiently dimerized to the diene 40. A trivial conversion of the olefin into diol readily afforded a novel tetraol 56, a building block suitable for constructing degradable polyethylene analogs. Another monomer 57 was also supplied rAP-Kolbe reaction of levulinic acid 55, one of the top-12 platform chemicals that can be mass produced from biorefineries according to the US Department of Energy. Then, 56 and 57 were condensed together in the catalytic amount of acid to construct a novel degradable polymer 58 with ketal linkages -an underutilized motif in degradable polymers. As ketals can be hydrolyzed by under acidic conditions, 58 can readily de-polymerized to its components by simply heating in aqueous sulfuric acid. This degradation mode is complementary to known biomass-derived degradable polymers which can be de-polymerized under basic conditions. This simple example powerfully illustrates enabling applications of biomass-derived carboxylic acids using the rAP-Kolbe reaction.