2.1 Chemicals and Reagents
Methanol and dichloromethane (DCM) were purchased from Merck KGaA
(Darmstadt, Germany). All of the samples were provided by Jianwei Han
research group at East China University of Science and Technology,
Shanghai. The preparation methods could be referred to relevant
articles.37-39 Some structures of the diaryliodonium
salts (M ) were given in Scheme 2 , while the rest
structures were shown in Scheme S1 , and they were labeled for
convenience as 1 to 54 . Salts 24 , 33and 34 contained OTs– as counter anion, the
rest diaryliodonium salts contained OTf– as counter
anion. DCM was a suitable aprotic solvent for preparing the solution of
diaryliodonium salts. In most cases, the diaryliodonium salts were
dissolved in DCM to prepare the sample solution at concentration of
1~10 µg/mL for mass spectrometric analysis.
Scheme 2 Chemical structures of some diaryliodonium salts
(1 ~16 ) in this study, Mes =
mesitylene.