Zhang Y, Tham FS, Nixon JF, Taylor C, Green JC, Reed CA. The low basicity of phosphabenzenes: first examples of protonation, alkylation, and silylation reactions. Angew Chem Int Ed Engl. 2008;47(20):3801–4. doi: 10.1002/anie.200800878. PMID: 18412206.