Homoallenyl
Homoallenyl is a term used in organic and organometallic chemistry to designate a substituent or ligand related to the allenyl group (the fragment derived from allene) but extended by one methylene unit. In this sense, homoallenyl motifs retain a cumulated diene framework but incorporate an additional CH2 in the chain, giving a family of structures that can vary with substitution and attachment point. Because the exact connectivity can differ by context, the intended structure is usually specified in the accompanying text of a study rather than by a universal formula.
Nomenclature and scope: The prefix homo- signals homologation, and homoallenyl is used primarily in specialized literature
Formation and relevance: Homoallenyl motifs arise in studies of enynes, allene derivatives, and related rearrangements, where