Allenes is a class of unsaturated compounds with cumulated double bonds. Featured with the same carbon atom possessing two orthogonal π orbitals, the electron cloud density of allenes can be tuned by substituent effect.
Alkynes product

Allenes is a class of unsaturated compounds with cumulated double bonds. Featured with the same carbon atom possessing two orthogonal π orbitals, the electron cloud density of allenes can be tuned by substituent effect.