Trimethylpropane monoallyl ester is an aliphatic polycarbonate, an important class of biodegradable/absorbable polymers. It possesses a wide range of physical, chemical, and biological properties, and comes in many varieties with tunable structures to meet diverse biomedical needs. Furthermore, the degradation of polycarbonates produces carbon dioxide and neutral diols, avoiding the adverse effects caused by carboxylic acids produced during the degradation of polylactic acid (PLA) and polyglycolic acid (PGA). Biodegradable polycarbonates are finding increasingly widespread applications in absorbable surgical sutures, controlled drug release, in vivo implant materials, and tissue regeneration. Trimethylpropane monoallyl ester can also be used as a pharmaceutical synthesis intermediate.