# Methods to prepare lactic acid from acetaldehyde

I got one method [here](using acetaldehyde and carbon monoxide)1.

But is there any alternative method (using specific catalyst)?

• What is the downvote for? – user14857 Sep 2 '15 at 18:33
• I'm not the downvoter or the upvoter, but it would be really nice if you add a summary of what's written there here. I could assume the downvote is because someone wasn't inclined to click on an external link to find out what your question really is. – M.A.R. Sep 2 '15 at 19:05

A fairly simple two step synthesis involves nucleophilic addition of $\ce{HCN}$ to the carbonyl group and then aqueous hydrolysis of the nitrile to yield the carboxylic acid product.
Acetylene + $$\ce{HCN-Ba(CN)2}$$ → vinyl cyanide