# Why does reduction of naphthalene with nickel/hydrogen lead to trans-decalin?

Is there any reason why $\ce{H2/Ni}$ leads to trans-decalin? I knew from high school that catalytic hydrogenations are always syn.

• The two questions you asked are only very poorly related. I urge you to reask the sodium/ehtanol question as a separate one (you can relink to the same image, though). – Jan Jan 31 '17 at 0:09