SPANphos
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SPANphos is an organophosphorus compound used as a ligand in organometallic and coordination chemistry. The compound is a rare example of a trans-spanning ligand and rigidly links mutually trans coordination sites. By virtue of its C 2 -symmetric backbone, SPANphos forms a chiral cavity over the face of a square planar complexes, e.g. in MCl 2 (SPANphos) (M = Pd, Pt).
SPANphos is an organophosphorus compound used as a ligand in organometallic and coordination chemistry. The compound is a rare example of a trans-spanning ligand and rigidly links mutually trans coordination sites. By virtue of its C 2 -symmetric backbone, SPANphos forms a chiral cavity over the face of a square planar complexes, e.g. in MCl 2 (SPANphos) (M = Pd, Pt). ==Synthesis== SPANphos can be prepared synthesized from relatively inexpensive reagents. In the first step 4,4,4',4',6,6'-hexamethyl-2,2'-spirobichromane is prepared via an acid-catalyzed reaction of p-cresol and acetone. The resultant spirocycle is halogenated with N-bromosuccinimide followed by lithium-bromide exchange using n-BuLi. Treatment of the resulting dilithio compound with chlorodiphenylphosphine completes the synthesis. ]] ==References==
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