Iron catalysts carbenoid

Although the dirhodium catalysts are the most commonly used today, other metals are still being explored for carbenoid C-H insertion [35], These include copper [36-45], silver [46, 47], iron [48-50], gold [40], and magnesium [51, 52], and most will be discussed in context, particularly in Sect. 3.1. 

In addition, carbenoid insertion of aliphatic C-H bond can be achieved in the presence of iron(III) porphyrin as catalyst. A benzylic C-H insertion product was obtained along with the arene C-H insertion product in a ratio of about 5 1 when p-xylene was used as substrate and solvent (eq 57). 

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