The bidentate ligand 2,11‐bis(diphenylphosphinomethyl)benzo[c]phenanthrene (1) was synthesized from 2,11‐dimethyl‐benzo[c]phenanthrene (3) via the corresponding bromomethyl derivative 9. 3 was obtained from the cyclization with boron trifluoride etherate of 1,1‐di‐(p‐methylphenethyl)‐epoxyethane (7), which was prepared from 1,5‐di(p‐tolyl)‐pentan‐3‐one (6).
Die Darstellung des zweizähnigen Titelliganden (VII) erfolgt ausgehend vom aus p‐Tolualdehyd und Aceton erhaltenen Dibenzylidenaceton (I) nach dem aufgezeigten Schema.
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