Syntheses of NHC adducts of bis[tris(trimethylsilyl)silyl]germylene and -stannylene and some structurally related cyclic disilylated stannylenes are reported. Reactions of a cyclic stannylene NHC adduct with gold and silver cyanide led to cationic metal complexes with two cyanostannyl ligands. The Ag complex decomposed further to a cyanostannide. Reactions of bis[tris(trimethylsilyl)silyl]germylene
Catalyst-free visible light-promoted defunctionalization of alkyl isocyanides with a hydrosilane through C–N bond cleavage
作者:Yu-Qing Ma、Shi-Kai Tian
DOI:10.1039/d4ob00173g
日期:——
A radical initiator-free defunctionalization reaction of alkylisocyanides with a hydrosilane has been established through C–N bond cleavage under catalyst-free visible light irradiation. Various alkylisocyanides participated in the defunctionalization with tris(trimethylsilyl)silane under blue light irradiation at room temperature, delivering the reduced products in good yields with high chemoselectivity
We report the use of isonitriles as alkyl radical precursors in visible-light mediated hydro- and deuterodeamination reactions. Most examples only require visible-light irradiation of the isonitrile in the presence of a silyl radical precursor, although a significant acceleration was observed in the presence of an organic photocatalyst. The method is scalable, shows broad functional group compatibility
我们报道了在可见光介导的加氢和氘代脱氨基反应中使用异腈作为烷基自由基前体。大多数例子仅需要在甲硅烷基自由基前体存在下对异腈进行可见光照射,尽管在有机光催化剂存在下观察到显着的加速。该方法具有可扩展性,显示出广泛的官能团兼容性,并且适用于 C α伯、C α仲和 C α叔烷基异腈。
Tris(trimethylsilyl)silane as a radical-based reducing agent in synthesis
作者:M. Ballestri、C. Chatgilialoglu、K. B. Clark、D. Griller、B. Giese、B. Kopping
DOI:10.1021/jo00002a035
日期:1991.1
Tris(trimethylsilyl)silane is an effective reducing agent for organic halides, selenides, xanthates, and isocyanides, as well as an effective hydrosilylating agent for dialkyl ketones and alkenes. The silane functions as a mediator in the formation of intermolecular carbon-carbon bonds via radicals and allows a variety of organic substrates to be used as alkyl radical percursors. Absolute rate constants for the reaction of (Me3Si)3Si radicals with a variety of organic compounds have been measured in solution by laser flash photolysis. At 294 K rate constants are > 5 x 10(7) M-1 s-1 for C = C double bonds that are activated by neighboring pi-electron systems or by electron-withdrawing groups. For other substrates, reactivities decreased in the order xanthate > selenide > isocyanide > nitro > sulfide.
BALLESTRI, M.;CHATGILIALOGLU, C.;CLARK, K. B.;GRILLER, D.;GIESE, B.;KOPPI+, J. ORG. CHEM., 56,(1991) N, C. 678-683
作者:BALLESTRI, M.、CHATGILIALOGLU, C.、CLARK, K. B.、GRILLER, D.、GIESE, B.、KOPPI+