Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Tetrahedron called Palladium-catalyzed desymmetric [2+2+2] cycloaddition of 1,6-enyne and alkyne, Author is Zhao, Wei-Cheng; Wang, Xin; Feng, Juhua; Tian, Ping; He, Zhi-Tao, which mentions a compound: 16400-32-1, SMILESS is CCC#CCBr, Molecular C5H7Br, Safety of 1-Bromo-2-pentyne.
A novel and straightforward palladium-catalyzed desym. [2+2+2] cycloaddition reaction of alkyne-tethered cyclohexadienone and internal alkyne is established. Widely existing fused tricyclic hydronaphthofuran and hydronaphthopyrrole frameworks are prepared diastereoselectively in moderate to excellent yields. One-step aromatization process provides a new and facile access to important benzene-containing tricycles from above cycloaddition products.
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Reference:
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics