(E)-non-3-en-2-ol

4-(3-hydroxybut-1-enylidene)-3,5,5-trimethylcyclohex-2-en-1-one

3-(1-chloroethoxy)but-1-yne

1-but-3-yn-2-yloxy-3-chloropropan-2-ol

buta-1,2-dien-1-yl phenylcarbamate