6-chloro-1-(tetrahydropyranyle-2-oxy) hex-2-yne

7-(tetrahydro-2'H-pyran-2'-yloxy)hept-5-ynenenitrile

methyl (Z)-7-((tetrahydro-2H-pyran-2-yl)oxy)hept-5-enoate

methyl 7-hydroxyhept-5-enoate

三溴化磷