High Quality Content by WIKIPEDIA articles! The Prins reaction is an organic reaction consisting of an electrophilic addition of an aldehyde or ketone to an alkene or alkyne followed by capture of a nucleophile. The outcome of the reaction depends on reaction conditions (scheme 1). With water and a protic acid such as sulfuric acid as the reaction medium and formaldehyde the reaction product is a 1,3-diol. When water is absent dehydration takes place to an allyl alcohol. With an excess of formaldehyde and a low reaction temperature the reaction product is a dioxane. When water is replaced by acetic acid the corresponding esters are formed. The original reactants employed by Dutch chemist Hendrik Jacobus Prins in his 1919 publication were styrene (scheme 2), pinene, camphene, eugenol, isosafrole and anethole.

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