Dow Chemical  (DOW) and DuPont (DFT) will reassess how they plan on separating into three firms following their merger, after investors from both companies raised concerns regarding the details of each new business, the Wall Street Journal reports.

Both Dow Chemical and DuPont said today that the combined board of directors would begin "a comprehensive review" of the businesses that will go into three spinoffs after the deal's closing, including a new look at cost-reduction plans and the timeline for the spinoffs.

The two firms also said today that Andrew Liveris, currently Dow Chemical's CEO and chairman, will serve as executive chairman of the merged DowDuPont from the closing of the deal, expected by September, through April 1 next year.

(Dow Chemical is held in Jim Cramer's charitable trust Action Alerts PLUS. See all of his holding with a free trial here. )