Abstract
The conventional palladium catalysts used in Heck reactions —Pd(OAc)2 + n P(aryl)3—suffer from extensive PC-bond cleavage at temperatures that would be necessary to activate aryl chlorides and electron-rich aryl bromides (> 120°C). This type of catalysts is, thus,not suitable to perform Heck reactions with non-activated substrates, especially with the technically interesting aryl chlorides.
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