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Adducts of Rh2[MTPA]4 with some phosphine chalcogenides: nature of binding and ligand exchange

✍ Scribed by Tamás Gáti; András Simon; Gábor Tóth; Damian Magiera; Stefan Moeller; Helmut Duddeck

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
222 KB
Volume
42
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Adducts of four phosphine chalcogenides with the chiral dirhodium complex ([RhRh]) were investigated by variable‐temperature ^1^H and ^31^P NMR spectroscopy in order to compare their properties as axial ligands. Whereas the selenide (1) and the sulfide (2) are strong ligands with electrostatic attration and, in addition, a significant orbital (HOMO–LUMO) interaction, the phosphine oxide compounds (PO) bind primarily via electrostatic attraction and are relatively weak donors. Moreover, the overall bond strength in these adducts depends on steric congestion around the PO group. Copyright © 2004 John Wiley & Sons, Ltd.

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Chiral phospholene and phospholane chalc
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## Abstract Twelve secondary phenylselenenylalkanes and ‐cycloalkanes were studied by ^1^H, ^13^C and ^77^Se NMR spectroscopy in the presence of the chiral dirhodium complex Rh~2~[(__R__)‐MTPA]~4~ [Rh–Rh; MTPA‐H = (__R__)‐(+)‐methoxytrifluoromethylphenylacetic acid, Mosher's acid]. The 1 : 1 and 2