Stabilized and Destabilized Carbocations in the 1,6-Methano[10]annulene Series
作者:Xavier Creary、Kevin Miller
DOI:10.1021/jo035006w
日期:2003.10.1
2-Chloromethyl and 3-chloromethyl-1,6-methano[10]annulenesystems solvolyze in methanol to give simple substitution products. Solvent effect studies and the special salt effect support the involvement of cationic intermediates stabilized by the 1,6-methano[10]annulene group. Rate data indicate that the degree of cation stabilization greatly exceeds that of naphthyl groups. B3LYP/6-31G computational
Site‐Selective Alkoxylation of Benzylic C−H Bonds by Photoredox Catalysis
作者:Byung Joo Lee、Kimberly S. DeGlopper、Tehshik P. Yoon
DOI:10.1002/anie.201910602
日期:2020.1.2
strategies for C-N and C-C bond formation. In particular, almost all methods for the incorporation of alcohols by C-H oxidation require the use of the alcohol component as a solvent or co-solvent. This condition limits the practical scope of these reactions to simple, inexpensive alcohols. Reported here is a photocatalytic protocol for the functionalization of benzylic C-H bonds with a wide range of oxygen
Dicyanobenzene sensitized carbon-carbon bond cleavage in methoxybicumenes. Products and mechanistic studies
作者:Przemyslaw Maslak、William H. Chapman
DOI:10.1016/s0040-4020(01)88366-6
日期:1990.1
Radical cations of p-methoxy-p-X-bicumenes generated by ET to excited-state dicyanobenzene undergo rapid irreversible C-C bond scission giving cumyl cations and radicals. The photoefficiency of the process (Φ = 0.13 for X = MeO, Φ< 0.005 for X = CN) and the fate of the radicals produced depends strongly on substitution.
Indium(<scp>i</scp>)-catalyzed alkyl–allyl coupling between ethers and an allylborane
作者:Hai Thanh Dao、Uwe Schneider、Shū Kobayashi
DOI:10.1039/c0cc03673k
日期:——
An efficient method for alkylâallyl cross-coupling between ethers and a 9-BBN-derived allylborane catalyzed by indium(I) triflate has been developed. The allylborane proved to be essential to obtain the desired products in high yields. The reaction displayed good substrate scope including high functional group tolerance.
“Design” of Boron-Based Compounds as Pro-Nucleophiles and Co-Catalysts for Indium(I)-Catalyzed Allyl Transfer to Various Csp3-Type Electrophiles
作者:Hai Thanh Dao、Uwe Schneider、Shū Kobayashi
DOI:10.1002/asia.201100096
日期:2011.9.5
our work highlights for the first time the correlation between the Lewis acidity of “electrophilic” boron‐based compounds and their “nucleophilic” reactivity in Csp3–Csp3 couplings, catalyzed by a “soft” low‐oxidation main group metal. In addition, we also report several applications of these methodologies to the selective synthesis of various carbohydrate derivatives.