Two Sterically Encumbered 1,3,2‐Dioxaphospholanes – Reactions,Comparison of Crystal Structures and Computational Explanations |
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Authors: | Matthias Freytag Jörg Grunenberg Peter G Jones Reinhard Schmutzler Prof Dr |
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Institution: | Braunschweig, Institut für Anorganische und Analytische Chemie der Technischen Universit?t |
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Abstract: | 3,4,5,6‐Tetrachlorobenzo‐3‐(2,4,6‐tri‐tert‐butylphenyl)‐1,3,2‐dioxaphospholane ( 2 ) and benzo‐3‐(2,4,6‐tri‐tert‐butylphenyl)‐1,3,2‐dioxaphospholane ( 4 ), in which the reactive PIII‐center lies close to the sterically demanding Mes* group (Mes* = 2,4,6‐tri‐tert‐butylphenyl), were prepared from Mes*–Br and the corresponding P‐chloro‐phospholane. Compounds 2 and 4 reacted with various oxidants, azides, MeSO3CF3 or (tht)AuCl] (tht = tetrahydrothiophene) to give the expected products. All crystal structures of the products display a strongly distorted Mes* system with a boat conformation of the phenyl ring and appreciable out‐of‐plane deviations of phosphorus and the ortho‐tert‐butyl groups to opposite sides of the ring. Quantum chemical calculations at the DFT (density functional theory) level of theory were used in order to discriminate between intra‐ and intermolecular forces, which are responsible for these distortions. |
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Keywords: | Gold Phospholanes 2 4 6‐tri‐Tri‐t‐butylphenyl‐3 4 5 6tetrachlorodioxaphospholane Crystal structures Gold complexes Quantum chemical calculations |
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