remains in solution. The following data are representative. A solution of phenylmagnesium bromide A-0.2060 N in basic magnesium and 0.2138 N in bromide ion was precipitated as described above with 1.0 and 1.1 equivalents of isoquinoline. The solutions after centrifuginp contained:(1 equivalent of isoquinoline) basic magnesium 0.1720 N (with respect to the volume of the original sample); bromide ion 0.0522