1-Pentyn-1-ylbenzene4250-81-133 % similar 1-Pentyne627-19-033 % similar 6-Dodecyne6975-99-133 % similar 2-Hexynoic acid764-33-033 % similar 5-Undecyne2294-72-632 % similar (3-Trimethylsilyl-2-propynyl)triphenylphosphonium bromide42134-49-631 % similar 5-Dodecyne19780-12-231 % similar