Micromass lct mass spectrometer

¹H (400 MHz), ¹³C{1H} (100 MHz), ³¹P{1H} (161 MHz) and ¹⁹F{1H} (376 MHz) NMR spectra were recorded on an Avance II⁺ 400 spectrometer (Bruker, Wissembourg, France) at 299 K (probe temperature). The chemical shifts are reported in parts per million (δ, ppm) and referenced to residual solvent peaks for ¹H (CDCl₃: δ = 7.26 ppm). The ³¹P- and ¹⁹F-NMR were referenced to the external aqueous solution of 85% H₃PO₄ and KF at 0.5 M, respectively in CDCl₃ (or in a mixture of DMSO-D₆/D₂O for PPh₃ spectra—see Supplementary Material, Figure S9). The IR spectra were measured on an Avatar 360 FTIR (Nicolet, Thermo Scientific, Waltham, MA, USA) in KBr pellets; only significant bands are mentioned in the text. The mass spectra (ESI-TOF) were recorded with a Micromass LCT mass spectrometer (Waters, Milford, MA, USA). Elemental analyses (C, H, N) were performed in a VariolEL instrument from Elementar Analysensysteme (Langenselbold, Germany). In the processing of the elemental analysis results of compound 3 and 4, the theoretical values were calculated taking into account the addition of dichloromethane molecules since their presence is observed in the ¹H-NMR spectra of both compounds. This situation arises from the inclusion of solvent molecules and/or inorganic salts in the dendritic structures during the isolation of the compound by precipitation.