Deuterium (D) is an isotope of hydrogen, in which the nucleus has one proton and one neutron. This nucleus, called a deuteron, behaves very much like a proton, although there are observed differences in the rates of reactions involving either protons or deuterons (an effect called the kinetic isotope effect). Deuterium can be introduced into a compound via the process below:
(a) The C—Mg bond in compound 3 can be drawn as ionic. Redraw 3 as an ionic species, with BrMg + as a counterion, and then draw the mechanism for the conversion of 3 to 4.