Answer to Question #142206 in Organic Chemistry for Den sen

Question

Why in the alkene hydrogenation get a syn addtion?

Answer 1

In case of alkene hydrogenation reaction is metal catalysed , first of all hydrogen bind to metal surface after that alkene approach hydrogen and bind simultaneously on both end , because of that syn addition take place

CH₂=CH₂ + H₂ $\to$ CH₃-CH₃