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Functionalization of Carbon Monoxide and tert ‐Butyl Nitrile by Intramolecular Proton Transfer in a Bis(Phosphido) Thorium Complex

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [1];  [2];  [1]
  1. Department of Chemistry University of Missouri Columbia MO 65211 USA
  2. Universite de Toulouse CNRS INSA, UPS, CNRS, UMR, UMR 5215 LPCNO 135 Avenue de Rangueil 31077 Toulouse France

Abstract

We report intramolecular proton transfer reactions to functionalize carbon monoxide and tert ‐butyl nitrile from a bis(phosphido) thorium complex. The reaction of (C 5 Me 5 ) 2 Th[PH(Mes)] 2 , Mes=2,4,6‐Me 3 C 6 H 2 , with 1 atm of CO yields (C 5 Me 5 ) 2 Th( κ 2 ‐(O,O)‐OCH 2 PMes‐C(O)PMes), in which one CO molecule is inserted into each thorium–phosphorus bond. Concomitant transfer of two protons, formerly coordinated to phosphorus, are now bound to one of the carbon atoms from one of the inserted CO molecules. DFT calculations were employed to determine the lowest energy pathway. With tert ‐butyl nitrile, t BuCN, only one nitrile inserts into a thorium–phosphorus bond, but the proton is transferred to nitrogen with one phosphido remaining unperturbed affording (C 5 Me 5 ) 2 Th[PH(Mes)][ κ 2 ‐(P,N)‐N(H)C(CMe 3 )P(Mes)]. Surprisingly, reaction of this compound with KN(SiMe 3 ) 2 removes the proton bound to nitrogen, not phosphorus.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; SC0014174
OSTI ID:
1483012
Alternate ID(s):
OSTI ID: 1612101
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 51 Vol. 57; ISSN 1433-7851
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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