diisobutylaluminium hydride; lt;Pd(H2O)2(Ph2PCH2CH2PPh2)gt;(CF3SO3)2 1) Et2O, -78 deg C, 5 h, 2) CH2Cl2, room temperature, 5 days; Yield given. Multistep reaction. Title compound not separated from byproducts;

lithium aluminium tetrahydride in tetrahydrofuran 3 h; Heating;