structural:reformatting, linguistic:paraphrasing
Hydration

The hydration reaction of acetylene gives acetaldehyde. The reaction proceeds by formation of vinyl alcohol, which tautomerizes to form the aldehyde. This reaction was once a major industrial process but it has been displaced by the Wacker process. This reaction occurs in nature, the catalyst being acetylene hydratase.

Hydration of phenylacetylene gives acetophenone:

(Ph P)AuCH catalyzes hydration of 1,8-nonadiyne to 2,8-nonanedione: