<scp>Iron‐Catalyzed</scp> Reductive C(aryl)—Si <scp>Cross‐Coupling</scp> of Diaryl Ethers with Chlorosilanes
作者:Pei Liu、Baowei Wu、Xuefeng Cong、Jie Kong
DOI:10.1002/cjoc.202300593
日期:2024.3.15
shows high activity in the successive cleavage of unactivated C(aryl)—Obonds of diaryl ethers and strong electrophilic Si—Cl bonds of chlorosilanes, allowing their cross-coupling in a reductive fashion. The low-valent iron species generated in situ by reduction of FeCl2 with iPrMgCl was proposed, which prefers to initially cleavage the C(aryl)—O bond of diaryl ethers with the chelation help of an o-amide
The far-UV photochemistry of five- and six-membered-ring monosilacycloalkenes in alcohols: stereospecific .beta.-cleavage to silyl ethers and stereoselective formation of silacycloalkyl ethers
作者:Mark G. Steinmetz、Changjun Yu
DOI:10.1021/jo00037a030
日期:1992.5
Photoalcoholysis of 1,1-dimethylsilacyclopent-2-ene (9) at 214 nm in methanol, 2,2,2-trifluoroethanol, and tert-butyl alcohol affords alkoxy(3-butenyl)dimethylsilanes 11 and 3-alkoxy-1,1-dimethylsilacyclopentanes 12. Also formed are alkoxy(cyclopropylmethyl)silanes 13 from apparent 1,3-C migration. In pure, deuterated alcohols (CH3OD and CF3CD2OD) adducts It and 12 become trans deuterated, whereas in dilute solutions of methanol-O-d in pentane, scrambling of deuterium between the trans and cis C-2 positions of 12 is observed without corresponding loss of stereospecificity for formation of silyl ether 11. Silyl ether 11 is thus produced via a pathway which is mechanistically distinct from that giving 12, for which the loss of stereoselectivity in dilute alcohols is ascribed to pseudorotational scrambling of deuterium in a silacyclopentyl cation intermediate. At high concentrations of alcohol the trans-stereoselective deuteration of 12 can be attributed to least hindered anti attack of the alcohol at C-3 of this hyperconjugatively stabilized cation. High cis-stereoselective deuteration of 12 is observed for photolysis in dilute CF3CD2OD in pentane, possibly reflecting the intermediacy of an ion pair or unsymmetrically solvated silacyclopentyl cation. Photoalcoholyses of the silacyclohex-2-ene were conducted for comparison.
The Preparation and Properties of Cyclic Six-Membered Silicon Compounds
作者:Robert Benkeser、Stanley Smith、James Noe
DOI:10.1021/jo01266a602
日期:1968.2
MANUEL, G.;FAUCHER, A.;MAZEROLLES, P., J. ORGANOMET. CHEM., 1984, 264, N 1-2, 127-133
作者:MANUEL, G.、FAUCHER, A.、MAZEROLLES, P.
DOI:——
日期:——
Thermal isomerization of 3-silabicyclo[3.1.0]hexanes: A new route to silacyclopentenes and silacyclohexenes
By thermolysis, 3-silabicyclo[3.1.0]hexanes lead to silacyclohexenes as major products and also to silacyclopentenes. The ratio of the different isomeric silicon rings is strongly dependent on the nature of the C(1) and C(5) substituents (R, R′ = H, Me).