16331-45-6Relevant articles and documents
Low-Resolution Microwave Studies of Substituted Ethyl- and Isopropylbenzenes
True, Nancy S.,Farag, Maya, S.,Bohn, Robert K.,MacGregor, Malcolm A.,Radhakrishnan, J.
, p. 4622 - 4627 (1983)
A single conformation exists in ethylbenzenes with the ethyl C-C bond lying in a plane orthogonal to the benzene ring.This conclusion results from the observation that asymmetrically substituted ethylbenzenes each display only a single band series in low-resolution microwave (LRMW) spectra whereas any other conformation of the ethylphenyl fragment would result in two spectroscopically distinguishable species.LRMW spectra of isopropylbenzene derivatives display three spectroscopically distinguishable band series, two of which correspond to the conformation with the methine C-H bond eclipsed with the benzene ring and syn or anti with respect to an unsymmetrical phenyl substituent.The third series is much more intense, has a B + C value which is the average of the syn and anti forms, and is consistent with the superposition of spectra of torsionally excited species.
Liquid crystal of ethyl and propyl aromatic aldehyde with azo core and photosensitivity in mesophase
Wei, Yong-Sheng,Zheng, Min-Yan,Geng, Wei,Wang, Shan,Shang, Yong-Hui
, p. 1883 - 1888 (2015)
Eight new stable rod-like aromatic aldehyde liquid crystalline molecules with azo bridge have been prepared, in which single or double six-membered carbon ring carboxylic acid mesogenic cores with shorter alkyl chain of ethyl, n-propyl were condensed with hydroxyl azo benzaldehyde. These compounds have been characterized by their spectral data, DSC and HS-POM. These molecules were expected to exhibit liquid crystal phase so that the influence of UV-light on their textures of mesophase could be detected. The results showed that all these target compounds have the temperature range of mesophase between 101 and 145°C. After irradiating under UV-light, they exihibited photo-sensitivity not only in methanol but also in mesophase.
Dilithium Amides as a Modular Bis-Anionic Ligand Platform for Iron-Catalyzed Cross-Coupling
Neate, Peter G.N.,Zhang, Bufan,Conforti, Jessica,Brennessel, William W.,Neidig, Michael L.
supporting information, p. 5958 - 5963 (2021/08/18)
Dilithium amides have been developed as a bespoke and general ligand for iron-catalyzed Kumada-Tamao-Corriu cross-coupling reactions, their design taking inspiration from previous mechanistic and structural studies. They allow for the cross-coupling of alkyl Grignard reagents with sp2-hybridized electrophiles as well as aryl Grignard reagents with sp3-hybridized electrophiles. This represents a rare example of a single iron-catalyzed system effective across diverse coupling reactions without significant modification of the catalytic protocol, as well as remaining operationally simple.
Modular Tuning of Electrophilic Reactivity of Iridium Nitrenoids for the Intermolecular Selective α-Amidation of β-Keto Esters
Lee, Minhan,Jung, Hoimin,Kim, Dongwook,Park, Jung-Woo,Chang, Sukbok
supporting information, p. 11999 - 12004 (2020/08/06)
We report herein an Ir-catalyzed intermolecular amino group transfer to β-keto esters (amides) to access α-aminocarbonyl products with excellent chemoselectivity. The key strategy was to engineer electrophilicity of the putative Ir-nitrenoids by tuning electronic property of the κ2-N,O chelating ligands, thus facilitating nucleophilic addition of enol π-bonds of 1,3-dicarbonyl substrates.