Isopropenylmagnesium bromide13291-18-4100 % similar 1-Propynylmagnesium bromide16466-97-043 % similar Ethylmagnesium bromide925-90-642 % similar Propylmagnesium bromide927-77-536 % similar Vinylmagnesium bromide1826-67-135 % similar Bromo(1-methylethyl)magnesium920-39-835 % similar Methylmagnesium bromide75-16-133 % similar Allylmagnesium bromide1730-25-232 % similar