NEW YORK (AP) -- Shares of some top chemicals companies are up at 10 a.m.:
Dow Chemical Co. rose $.31 or .9 percent, to $34.32.
DuPont Co. rose $.96 or 1.8 percent, to $53.64.
Over the past few years, Citigroup Inc has been grappling with an unusual problem - how to incur more U.S. taxes. …