3-methyl-4-((trimethylsilyl)methylene)dihydrofuran-2(3H)-one

ethyl 2-bromo-2-methyl-3-oxobutanoate

Butanoic acid, 4-bromo-2-methyl-3-oxo-, methyl ester

3-(trimethylsilyl)prop-2-yn-1-yl 2-bromopropanoate