2-butyl-3-pent-4-ynylcyclohex-2-en-1-one

2-butyl-3-[cyclobutylidene(trimethylsilyl)methyl]cyclohex-2-en-1-one

5-chloropent-1-en-2-yl(trimethyl)stannane

6-chlorohex-2-ynoic acid

ethyl 6-chlorohex-2-ynoate