Addition Reactions of Tris(trimethylsilyl)germyl Radicals to Unsaturated Compounds. An EPR and Product Study
Authors:
- Stefania Bernardoni,
- Marco Lucarini,
- Gian Franco Pedulli,
- Luca Valgimigli,
- Vladimir Gevorgyan,
- Chryssostomos Chatgilialoglu
Abstract
Tris(trimethylsilyl)germyl radicals, (TMS)3Ge·, thermally or photochemically generated by means of suitable radical initiators, were reacted with a number of unsaturated compounds. The preparative scale reaction of (TMS)3GeH with a variety of alkynes proceeded stereo- and regioselectively affording exclusively 2-alkenylgermanes in excellent chemical yields. In the analogous reactions with alkenes, no addition products were obtained except in the case of 4-vinylpyridine. This behavior is explained in terms of the reversibility of germyl radical addition to olefines. The reaction with arylalkenes, ketones, quinones, azines, and nitroalkanes was instead carried out in the cavity of an EPR spectrometer. In most cases the corresponding radical adducts were observed; however, quite often the intensity of the spectra was lower than expected and with azines no EPR signals could be detected. These results have been interpreted as an indication that the addition reaction of tris(trimethylsilyl)germyl radicals to multiple bonds is less exothermic than that of trialkylgermyl radicals. With some of the investigated compounds, the addition of (TMS)3Ge· is thermoneutral or even endothermic and is therefore readily reversible.
- Record ID
- UAMfd83d1799298485fa29987b84dbb99b5
- Author
- Journal series
- Journal of Organic Chemistry, ISSN 0022-3263
- Issue year
- 1997
- Vol
- 62
- Pages
- 8009-8014
- ASJC Classification
- DOI
- DOI:10.1021/jo970711o Opening in a new tab
- Language
- (en) English
- Score (nominal)
- 0
- Score source
- journalList
- Publication indicators
- = 25; = 26; : 1999 = 1.322; : 2006 (2 years) = 3.790 - 2007 (5 years) =3.716
- Citation count
- 35
- Uniform Resource Identifier
- https://researchportal.amu.edu.pl/info/article/UAMfd83d1799298485fa29987b84dbb99b5/
- URN
urn:amu-prod:UAMfd83d1799298485fa29987b84dbb99b5
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or PerishOpening in a new tab system.