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

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

  • $\begingroup$ What is the downvote for? $\endgroup$ – user14857 Sep 2 '15 at 18:33
  • 4
    $\begingroup$ 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. $\endgroup$ – 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.

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Acetylene + $\ce{HCN-Ba(CN)2}$ → vinyl cyanide

Vinyl cyanide - hydrolysis → acetaldehyde cyanohydrin

Acetaldehyde cyanohydrin - dil HCl → lactic acid


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