1: 2-ethyl-3-methyl-1-propanol; carbon dioxide; dioctyl-bis(2-ethylbutyloxy)tin With 1,1,3,3-tetraoctyl-1,3-bis(2-ethylbutyloxy)distannoxane T=120°C; P=30003 Torr; 2: phenol T=40°C; 1 h; Inert atmosphere; Product distribution / selectivity;