Piperonal
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Piperonal, also known as heliotropin, is an organic compound which is commonly found in fragrances and flavors. The molecule is structurally related to other aromatic aldehydes such as benzaldehyde and vanillin. The methylenedioxyphenyl group is found in other fragrances.
Piperonal, also known as heliotropin, is an organic compound which is commonly found in fragrances and flavors. The molecule is structurally related to other aromatic aldehydes such as benzaldehyde and vanillin. The methylenedioxyphenyl group is found in other fragrances. ==Preparation== Piperonal can be prepared by the oxidative cleavage of isosafrole or by using a multistep sequence from catechol or 1,2-methylenedioxybenzene. Synthesis from the latter chemical is accomplished through a condensation reaction with glyoxylic acid followed by cleaving the resulting α-hydroxy acid with an oxidizing agent. Synthesis from catechol requires an additional step, Williamson ether synthesis using dichloromethane. ==Reactions== Piperonal, like all aldehydes, can be reduced to its alcohol (piperonyl alcohol) or oxidized to give its acid (piperonylic acid). Piperonal can be used in the synthesis of some pharmaceutical drugs including tadalafil, L-DOPA, and atrasentan.
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