How would you draw the product of the hydrogenation of ethyne?

1 Answer
Nov 16, 2015

There is no specific reaction mentioned, so I'll list all the ones that are relevant.

The highlighted hydrogens are the ones added onto the alkyne.

  • The first one you learned, hydrogen with palladium over carbon, goes all the way to alkane.

  • You can tell that hydrogen with Lindlar's Catalyst stops the hydrogenation at the cis-alkene.

  • The sodium/ammonia radical reaction stops the hydrogenation at the trans-alkene.