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Triphenylphosphonium salt, TPE-TPP, was prepared from 3 (0.5 g, 1.0 mmol) and triphenylphosphine (1.0 g, 4.0 mmol) in DMF at 100° C. After stirring for 24 h, the solution was poured into large amount of toluene. The white precipitate was collected in 80% yield. 1H NMR (400 MHz, DMSO-d6), δ (TMS, ppm): 7.90-7.55 (m, 30H), 7.16-6.66 (m, 18H), 5.039 (d, 4H). 13C NMR (100 MHz, DMSO-d6), δ (TMS, ppm): 143.4, 142.5 140.1, 135.2, 134.0, 131.1, 130.6, 130.3, 130.1, 128.0, 127.0, 126.1, 118.1, 17.2, 40.21. m/z (MALDI-TOF) 882.49 [M−2Br)+]; calc. 882.35. Anal. Calcd. C64H52Br2P2: C, 73.7; H, 5.0. Found: C, 73.7; H, 4.9.

1. customThe white precipitate was collected in 80% yield