1: sodium perborate tetrahydrate / acetic acid / 3 h / 50 °C 2: 35 percent Chromat. / NiCl2(PPh3)2, p-tolylmagnesium bromide / tetrahydrofuran; diethyl ether / 3 h / Ambient temperature View Scheme

1: sodium perborate tetrahydrate / acetic acid / 3 h / 50 °C 2: 4 percent Chromat. / Ni(acac)2 / tetrahydrofuran; diethyl ether / 3 h / Ambient temperature View Scheme

PPA T=90 - 100°C; 1 h;

PPA(phosphoric pentaoxide T=20 - 30°C;

PPA T=90 - 100°C; 1 h;