In:
Angewandte Chemie, Wiley, Vol. 127, No. 40 ( 2015-09-28), p. 11957-11960
Abstract:
The first coupled operando EPR/UV‐Vis/ATR‐IR spectroscopy setup for mechanistic studies of gas‐liquid phase reactions is presented and exemplarily applied to the well‐known copper/TEMPO‐catalyzed (TEMPO=(2,2,6,6‐tetramethylpiperidin‐1‐yl)oxyl) oxidation of benzyl alcohol. In contrast to previous proposals, no direct redox reaction between TEMPO and Cu I /Cu II has been detected. Instead, the role of TEMPO is postulated to be the stabilization of a (bpy)(NMI)Cu II ‐O 2 ⋅− ‐TEMPO (bpy=2,2′‐bipyridine, NMI= N ‐methylimidazole) intermediate formed by electron transfer from Cu I to molecular O 2 .
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v127.40
DOI:
10.1002/ange.201504813
Language:
German
Publisher:
Wiley
Publication Date:
2015
detail.hit.zdb_id:
506609-8
detail.hit.zdb_id:
1479266-7