allyylisiä

Allyylisiä refers to a class of organic compounds characterized by the presence of an allyl group. An allyl group is a functional group with the chemical formula H2C=CH−CH2−. It consists of a double bond and a methylene group adjacent to it. Allyylisiä compounds thus contain this specific three-carbon unsaturated moiety.

The allyl group's reactivity stems from the allylic position, which is the carbon atom directly attached to the double bond. This position is susceptible to various chemical reactions, including substitution and addition, due to the delocalization of electrons across the pi system of the double bond and the adjacent sigma bond. Allylic halides, for instance, are particularly reactive in nucleophilic substitution reactions.

Common examples of allyylisiä compounds include allyl alcohol (propen-2-en-1-ol), allyl chloride (3-chloroprop-1-ene), and allyl bromide (3-bromoprop-1-ene). These compounds serve as important intermediates in the synthesis of a wide range of organic chemicals, including polymers, pharmaceuticals, and fragrances. The double bond in the allyl group can undergo polymerization, leading to materials with diverse properties. The allylic position also allows for rearrangements and other transformations that are useful in organic synthesis. The term allyylisiä is a Finnish word, and the English equivalent is "allylic compounds."