CO insertion intermediate

Additional complications with regard to recognition of an insertion reaction may arise if the acyl produced defies isolation by undergoing a further transformation. Equations (17)-(19) 78, 134, 115) provide diversified examples of such behavior (the postulated CO insertion intermediates are enclosed in brackets). The intermediacy of acyl complexes in these reactions can sometimes be inferred through examination of the infrared or NMR spectra of reaction solutions. In a number of cases, however. 

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See also in sourсe #XX -- [ ]

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