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- W2050552974 abstract "Abstract An organoplatinum complex containing the ( S )‐form of orthometalated [1‐(dimethylamino)ethyl]naphthalene as the chiral auxiliary promotes the asymmetric [2+2] dimerization of ( E )‐2‐(diphenylphosphanyl)styrene to generate two isomeric chelating diphosphanyl‐substituted cyclobutane platinum template complexes in the ratio of 6:1. The four substituents on the cyclobutane rings adopt the pseudo‐equatorial positions with an all ‐ trans arrangement. The naphthylamine auxiliary can be removed chemoselectively from the template products by treatment with concentrated hydrochloric acid to form the corresponding dichloroplatinum( II ) complexes, which, upon subsequent ligand displacement with aqueous cyanide, liberate the enantiomerically enriched free diphosphane ligand in high yields. Recomplexation of the liberated diphosphane to the ( R )‐form of the platinum template, followed by fractional crystallization, allows separation of the optically pure platinum template complex containing the diphosphane ligand (1 R ,2 R ,3 R ,4 R )‐1,2‐bis(diphenylphosphanyl)‐3,4‐diphenylcyclobutane, from which the free diphosphane can be subsequently liberated efficiently. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)" @default.
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- W2050552974 date "2005-11-21" @default.
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- W2050552974 title "Asymmetric [2+2] Cycloaddition of (<i>E</i>)‐2‐(Diphenylphosphanyl)styrene Promoted by a Chiral Metal Template" @default.
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- W2050552974 doi "https://doi.org/10.1002/ejic.200500549" @default.
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