Sometimes during catalytic hydrogenation, the partially hydrogenated products become volatile, melting and evaporating away before they can bind to more hydrogen atoms. Now, researchers have explored how and why this volatility varies during hydrogenation, suggesting that a previously underappreciated effect from carbon-hydrogen bonds is the main culprit. The new analysis can help chemists identify the ideal conditions needed for catalytic hydrogenation so they can better remove excess hydrogen. – Source