(Bloomberg) -- Abu Dhabi National Oil Co. has made a preliminary takeover approach for German chemical producer Covestro AG, people with knowledge of the matter said. Most Read from BloombergAlibaba Names Tsai Chairman, Wu CEO in Surprise Shake-UpTucker Carlson's Fox Defense Crumbled When He Took MillionsThese Are World’s Most Expensive Cities for High-Class LivingSingapore’s Grab Plans Biggest Job-Cut Round Since PandemicXi Tells Blinken ‘Very Good’ That Progress Made on US-China TiesThe state-