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The application of the highly efficient ruthenium catalyst [Ru(CO)2{P(p‐CF3–C6H4)3}2(O2CPh)2] (1) in the selective syn‐addition of carboxylic acids to internal alkynes, yielding valuable trisubstituted enol esters with (E)‐configuration, is described. All reactions feature excellent stereoselectivities and good regioselectivities. The regioselectivity is dictated by electronic and steric aspects of...
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