One Stone Three Birds: Regiodivergent Access to Amino-Substituted Benzophospholes and Their Structure–Property Relationships

Three series new NH2-benzophosphole oxides were synthesized from cycloaddition of o-aminophenyl phosphine oxide with alkynes. Photophysics investigation and theoretical calculation indicate that the position of amino group in these benzophosphole oxides obviously regulate their properties. 4-NH2-benzo[b]phosphole oxides show strong fluorescence emission and high fluorescence quantum efficiency. This “One stone three birds” process provides rapid access to multiple organophosphorus based luminogens for the structure–property relationship study.