20 Dec 2016 --- China National Chemical Corp (ChemChina) has further extended the deadline of its $43bn offer for Syngenta to March 2 next year. The extension of the deal follows a number of other extensions as the deal seeks regulatory approval in certain markets. ChemChina had previously extended the deadline to January 5 but this latest extension means that Syngenta investors now have an extra two months to tend their shares.