diisobutylaluminium hydride in hexane 1.) 25 deg C, 1 h, 2.) ferlux, 1 h;

1: 68 percent / p-toluenesulfonic acid monohydrate / 5 h / 210 °C 2: 95 percent / diisobutylaluminum hydride / hexane / 1.) 25 deg C, 1 h, 2.) ferlux, 1 h View Scheme