Yield 36,3 mg (67%). UV-vis (CH2Cl2) λmax [nm, ε x 10 -4 (M Diffraction data were collected using synchrotron radiation monochromated using silicon(111) to a wavelength of 0.7293(1)Å. An approximate full-sphere of data was collected using 0.6° w scans. The structure was solved by direct methods (SHELXT) and refined by full-matrix least squares on F 2 (SHELXL-2013). All non-hydrogen atoms were refined anisotropically. Hydrogen atoms were geometrically calculated and refined as riding atoms. Full details of the analyses are given in the crystallographic information files, which can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif.