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α-Silyl Ethers as Hydroxymethyl Anion Equivalents in Photoinduced Radical Electron Transfer Additions

✍ Scribed by Guido Gutenberger; Eberhard Steckhan; Siegfried Blechert


Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
113 KB
Volume
37
Category
Article
ISSN
0044-8249

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✦ Synopsis


Nucleophilic α-hydroxymethyl radicals can be generated from α-silyl ethers by irradiation in the presence of 9,10-anthracenedicarbonitrile (ADC) and biphenyl (BP). Under these conditions the hydroxymethyl radicals are not oxidized further but add directly to electron-poor alkenes [Eq. (a); EWG=electron-withdrawing group]. The radical adduct undergoes back electron transfer to form the carbanion, which is protonated. R=PhCH , tBuMe Si, Me; TMS=Me Si.


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