作者:Annette D. Allen、John Andraos、Thomas T. Tidwell、Sinisa Vukovic
DOI:10.1021/jo402438w
日期:2014.1.17
zwitterions, and these undergo amine catalyzed dealkylation forming N,N-disubstituted amides. Reactions of N-methyldialkylamines show a strong preference for methyl group loss by displacement, as predicted by computational studies. Loss of ethyl groups in reactions with triethylamine also occur by displacement, but preferential loss of isopropyl groups in the phenylketene reaction with diisopropylethylamine
Gold nanoparticles supported on supramolecular ionic liquid grafted graphene: a bifunctional catalyst for the selective aerobic oxidation of alcohols
作者:Mojtaba Mahyari、Ahmad Shaabani、Yasamin Bide
DOI:10.1039/c3ra44696d
日期:——
Goldnanoparticlessupported on supramolecular ionic liquid grafted graphene have been synthesized and used as a bifunctional, efficient and recyclable heterogeneous catalyst for the aerobicoxidation of various primary and secondary aliphatic and aromatic alcohols to the corresponding aldehyde and ketone derivatives in water as a green solvent at room temperature.
Spectroscopy and Absolute Reactivity of Ketenes in Acetonitrile Studied by Laser Flash Photolysis with Time-Resolved Infrared Detection
作者:Brian D. Wagner、Bradley R. Arnold、Gerald S. Brown、Janusz Lusztyk
DOI:10.1021/ja964155b
日期:1998.3.1
to the Swain−Lupton field (F) and resonance (R) effectsubstituent parameters was unsatisfactory, whereas the correlation to the inductive substituent parameter (σI) of Charton gave excellent results. This suggests that the asymmetric stretching frequency of substituted ketenes depends mainly on the inductive (i.e., field) effect of the substituents. The mechanism and kinetics of the reactions of these
reaction of substituted phenylketenes with diethylamine in acetonitrile were suggested to be the amideenols rather than the zwitterions on the basis of the theoretical calculations. A single broad band at 1674 cm−1 observed for reaction with the primary amines was attributed to overlap of two bands of the intermediate (amideenol) and the final product (amide). The substituenteffect for the second‐order
Imidazol-5-one as an Acceptor in Donor–Acceptor Cyclopropanes: Cycloaddition with Aldehydes
作者:Andrey A. Mikhaylov、Andrei V. Kuleshov、Pavel N. Solyev、Alexander A. Korlyukov、Pavel V. Dorovatovskii、Konstantin S. Mineev、Mikhail S. Baranov
DOI:10.1021/acs.orglett.0c00725
日期:2020.4.3
donor–acceptor (D–A) cyclopropanes in a formal cycloaddition reaction with aldehydes. The activation of such type of cyclopropanes is achieved with an equivalent of Brønsted acid. The reaction proceeds in high yields of 51–92% and demonstrates moderate diastereoselectivity at the quaternary stereocenter, which is determined by the electron-donating nature of the aldehyde partner. The ease of separation of stereoisomers