1-bromo-3-methoxy-3-methylbut-1-yne

lithium,3-methoxy-3-methylbut-1-yne

6-methoxy-2,6-dimethylhept-4-yn-3-one

4-methoxy-4-methyl-1-(3-methylphenyl)pent-2-yn-1-one

(6-methoxy-3,3,6-trimethylhepta-1,4-diynyl)-trimethylsilane