Electrophilic Trapping of Arylmetal Intermediates with Borates

1 Electrophilic Trapping of Arylmetal Intermediates with Borates 

One of the first and, probably, still the cheapest and most common way of synthesizing arylboronic adds involves the reaction of a hard organometallic intermediate (i.e., Hthium or magnesium) with a borate ester at low temperature. The corresponding zinc and cadmium species are much less effective [173]. 

1 By Metal-Halogen Exchange with Aryl Halides 

1 Electrophilic borate trapping of arylmetal intermediates from aryi haiides 

2 Electrophilic borate trapping of aryimetai intermediates from directed ortho-metaiiation 

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