1: 93 percent / tetrabutylammonium fluoride / tetrahydrofuran / 0.33 h 2: 94.4 percent / H2 / 10percent Pd/C / methanol; ethyl acetate / Ambient temperature View Scheme

tetrabutyl ammonium fluoride in ethyl acetate 0.5 h;

 in  acetone T=20°C; 44 h;  UV-irradiation;