1: 32 percent / tetrabutylammonium bromide (TBAB) / benzene; H2O / 40 h / Heating 2: 55 percent / benzene / 14 h / Heating 3: 95 percent / Pd(Ph3P)4 / tetrahydrofuran / 6 h View Scheme

in acetic acid Heating;

(hydrolysis);