Mechanism of Transition-Metal-Catalyzed Decarbonylation of Carboxylic Acids to Olefins via Anhydrides Manuel A. Ortuño, Büşra Dereli Cramer Group Conversion of natural-product feedstocks into valuable synthetic chemicals has become a crucial issue due to the increasing shortage of fossil reserves. Among the different renewable resources available, biomass-derived carboxylic acids are excellent substrates to obtain highvalue α-olefins via catalytic deoxygenation processes. In this line, the decarbonylation dehydration reaction appears as a quite useful protocol to convert readily available carboxylic acids to olefins. This process can be catalyzed by transition metal complexes and mediated by either anhydride or ester derivatives. The present work aims to unravel the reaction mechanism of the transition-metal-catalyzed decarbonylation of hydrocinnamic acid by means of DFT calculations. The understanding of the reaction at the microscopic level might point toward new directions to rationally design more efficient catalysts.