... Volume: Page ... 4, 9 5, 10 6, 11 and 7 12 in Scheme 1 are known compounds and our melting points and/or 1 H NMR spectra ... Figure 1 Crystal structures of (a) 1H, (b) 3PP, (c) 2X, and (d) 2X/ZnCl 2 . The red lines highlight the planar vs pyramidal geometries of the ...