Photosubstitution of Dicyanoarenes by Hypervalent Allylsilicon Reagents via Photoinduced Electron Transfer
作者:Daisuke Matsuoka、Yutaka Nishigaichi
DOI:10.1246/cl.131132
日期:2014.4.5
Photosubstitution of dicyanoarenes with hypervalent allylsilicon reagents in the presence of anthracene efficiently proceeded to afford the allyl-substituted product in moderate to good yields. The efficiency for the present photoreaction was much higher than that for the tetracoordinate allylsilanes, because hypervalent allylsilicon reagents possess lower oxidation potential than the tetracoordinate ones, which resulted in more efficient photoinduced electron-transfer process.
Hypervalency (pentacoordination) of silicon atom enhanced photoallylation of 1,2-diketones with allylsilicon reagents, while normal tetracoordinated ones could not. This reaction seems to proceed via photoinduced electron transfer from the silicon reagent to the photoexcited ketone judged from its reactivity and selectivity. (c) 2005 Elsevier Ltd. All rights reserved.
CERVEAU, G.;CHUIT, C.;CORRIU, R. J. P.;REYE, C., J. ORGANOMET. CHEM., 328,(1987) N 3, C17-C20
作者:CERVEAU, G.、CHUIT, C.、CORRIU, R. J. P.、REYE, C.
DOI:——
日期:——
Reactivity of hypervalent species of silicon: cleavage of the allyl-silicon bond
The reactivities of the silicon-allyl bonds in two kinds of pentacoordinated siliconspecies CH2CHCH2Si(o-O2C6H4)2 −NMe4+ (1) and CH2CHCH2- Si(OCH2CH2)3N (2) has been compared. In the allyl transfer to carbonyl compounds under nucleophilic conditions (NaOMe, KF or Bu4NF) and electrophilic conditions (TiCl4, AlCl3, BF3) these two species show quite different behaviour. Complex 1 is activated by nucleophiles
Allyl-transfer Reaction from Photoexcited Hypervalent Allylsilicon Reagent toward Dicyanobenzenes
作者:Daisuke Matsuoka、Yutaka Nishigaichi
DOI:10.1246/cl.140940
日期:2015.2.5
Photoreaction between dicyanobenzenes and a hypervalent allylsilicon reagent using 2,3-dihydroxynaphthalene as a ligand on silicon efficiently proceeded to afford allyl-substituted benzonitriles in moderate to good yields. The present photoreaction was found to occur based on the excitation of the hypervalent allylsilicon reagent.