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• W2066905422 abstract "Abstract First enantiomerically pure phosphapalladacycle bearing an asymmetric carbon directly bonded to a palladium atom as a single chirality source was prepared by the resolution of racemic dimer {Pd(η2-L)(μ-Cl)}2 (1), where L = 2 - Bu 2 t PC 6 H 4 CHMe , using (R,R)-stilbendiamine as an auxiliary ligand. Double recrystallization of a 1:1 mixture of diastereomers (S,RR)-4a and (R,RR)-4b from MeCN affords one of them, (S,RR)-4a, as a single isomer (>98% de, 31P{1H} NMR data). Another diastereomerically pure complex, (R,SS)-4c, was isolated by the same method using (S,S)-stilbendiamine as a resolving agent. This diastereomer (R,SS)-4c was converted into the enantiopure dimer (R,R)-1 (>98% ee, 31P{1H} NMR data) by the diamine protonation with dilute acetic acid at ∼5 °C. Dimer (R,R)-1 is configurationally stable at high temperatures up to at least 110 °C. The absolute configuration of the C∗-stereocenter in dimer (S,S)-1 was established by an X-ray diffraction study of its precursor (S,RR)-4a." @default.
• W2066905422 created "2016-06-24" @default.
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• W2066905422 date "2011-01-01" @default.
• W2066905422 modified "2023-09-25" @default.
• W2066905422 title "First enantiopure phosphapalladacycle with a palladium bonded stereogenic carbon as the sole chirality source" @default.
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• W2066905422 doi "https://doi.org/10.1016/j.poly.2010.09.024" @default.
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