Novel stable phosphastannapropene derivatives. Synthesis and characterization

International audience; Phosphastannapropenes containing the -P=C-Sn < moiety are very scarcely reported in the literature, but their structure suggests that they can be of interest as precursors of inorganic materials, and their potential catalitic activity is worth investigating. Several new phosphastannapropenes were synthesized starting from the dichlorophosphaalkene Mes*P=CCl2 (Mes* = 2,4,6-tri-tertbutyl-phenyl) and dichlorotin derivatives following the synthetic route similar to that described in the literature for phosphasilaand phosphagermapropenes. The tin atom is either substituted by organic groups with low sterical hindrance, or incorporated in a cyclic system. The compounds were characterized by multinuclear NMR spectroscopy and, in some cases, single-crystal X-ray diffraction.