描述
2-methylbut-2-en-1-al, also known as (E)-2-methyl-2-butenal, is a member of the class of compounds known as enals. Enals are an alpha,beta-unsaturated aldehyde of general formula RC=C-CH=O in which the aldehydic C=O function is conjugated to a C=C triple bond at the alpha,beta position. 2-methylbut-2-en-1-al is soluble (in water) and an extremely weak basic (essentially neutral) compound (based on its pKa). 2-methylbut-2-en-1-al can be found in apple, garden onion, and peppermint, which makes 2-methylbut-2-en-1-al a potential biomarker for the consumption of these food products.