Deutsche Bank analyst David Begleiter says a breakup of DuPont (DD) is "highly likely" following the exit of CEO Ellen Kullman. Interim CEO Ed Breen broke up Tyco (TYC) twice when he ran the company, Begleiter tells investors in a research note. The separation of DuPont into an Ag/Nutrition/Biosciences company and a Chemical/Materials company would unlock "substantial" shareholder value, the analyst contends. His sum-of-the-parts analysis yields a value of $67 per share. DuPont closed yesterday up $2.01 to $51.27. Begleiter lowered his price target for the shares to $63 from $66 and reiterates a Buy rating on the name.