Table 2. Exploring various alkylboron compounds ^a .

Alkylboron	Reduction potential	Result	Drawbacks
	>2.5 V vs. SCE	No conversion	• Air sensitive
			• Poor redox properties
	>2.5 V vs. SCE	No conversion	• Limited commercial availability
			• Poor atom economy
			• Poor redox properties
	>2.5 V vs. SCE	<5% conversion	• Air sensitive
			• Poor atom economy
			• Poor redox properties
	+1.1 V vs. SCE	No conversion	• Limited commercial availability
			• Hydrolytically unstable
			• Poor atom economy

^aReactions were run with heteroarene (1.0 equiv.), alkylboron reagent (1.0 equiv.), MesAcr (5 mol%), K₂S₂O₈ (2.0 equiv.), trifluoroacetic acid (1.0 equiv.) in MeCN/H₂O (1 : 1) on 0.2 mmol scale.