White solid or colorless liquid; mp = 22.5 deg C; [GFS Chemicals MSDS] Melting point = 27 deg C; [ChemSampCo MSDS]
Comments
A skin and eye irritant; Vapor or mist causes eye, mucous membrane, and upper respiratory tract irritation; [ChemSampCo MSDS] See "4-Nonyne" and "Methylacetylene."