1-methoxybut-2-yne

4-(but-2-ynoxymethyl)-1-methylsulfonylpiperidine

1-prop-2-enoxybut-2-yne

4-[tert-butyl(dimethyl)silyl]oxybut-2-yn-1-ol

ethyl 6-hydroxy-4-methylhexa-2,4-dienoate