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Shining new light on the Ullmann reaction | Chemistry World - a copper mediated carbon–nitrogen coupling reaction used to create arylamines – is one of the most widely used reactions in the pharmaceutical industry. But while extensive work has been done on the chemistry of the reaction, until now it has generally been thought that the mechanism proceeds via a concerted oxidative addition to cleave off the aryl group. And there has been no evidence to contradict this, until Greg Fu and Jonas Peters at the California Institute of Technology, US, started collaborating that is.(10.1126/science.1226458)

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