- Regioselective monobromination of phenols with KBr and ZnAl–BrO3?–layered double hydroxides
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The regioselective mono-bromination of phenols has been successfully developed with KBr and ZnAl–BrO3?–layered double hydroxides (abbreviated as ZnAl–BrO3?–LDHs) as brominating reagents. The para site is much favorable and the ortho site takes the priority if para site is occupied. This reaction featured with excellent regioselectivity, cheap brominating reagents, mild reaction condition, high atom economy, broad substrate scope, and provided an efficient method to synthesize bromophenols.
- Wang, Ligeng,Feng, Chun,Zhang, Yan,Hu, Jun
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supporting information
(2020/02/22)
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- BIARYL KINASE INHIBITORS
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The present disclosure is directed to biaryl compounds of formula (I) which can inhibit AAKl (adaptor associated kinase 1), compositions comprising such compounds and their use for treating e.g. pain, Alzheimer's disease, Parkinson's disease and schizophrenia.
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Page/Page column 453
(2017/05/07)
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- P-Hydroxyphenacyl photoremovable protecting groups Robust photochemistry despite substituent diversity
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A broadly based investigation of the effects of a diverse array of substituents on the photochemical rearrangement of p-hydroxyphenacyl esters has demonstrated that common substituents such as F, MeO, CN, CO2R, CONH2, and CH3 have little effect on the rate and quantum efficiencies for the photo-Favorskii rearrangement and the release of the acid leaving group or on the lifetimes of the reactive triplet state. A decrease in the quantum yields across all substituents was observed for the release and rearrangement when the photolyses were carried out in buffered aqueous media at pHs that exceeded the ground-state pKa of the chromophore where the conjugate base is the predominant form. Otherwise, substituents have only a very modest effect on the photoreaction of these robust chromophores.
- Givens, Richard S.,Stensrud, Kenneth,Conrad, Peter G.,Yousef, Abraham L.,Perera, Chamani,Senadheera, Sanjeewa N.,Heger, Dominik,Wirz, Jakob
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scheme or table
p. 364 - 384
(2011/06/22)
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- Liquid crystal compounds and compositions
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Smetic C liquid crystal compounds, represented by the following formula (1) or (2) are disclosed. R1-O-A1-C≡C-A2-CO-(O)P-R2 (2)wherein R1and R2are C1-18 alkyl groups; A is a cyclic group, such as aubstituted or unsubstituted 1,4-phenylene group, X is direct bond, O or C#IDW#C; Y is -C#IDW#C- or -CH2CH2-; one of A1and A2is 1,4-phenylene group and the other is, 2,3-difluoro-1,4-phenylene group; and p is 0 or 1. These compounds can provide ferroelectric liquid crystal composition of low viscosity, and are useful as a component giving negative dielectric anisotropy and enlarging a temperature range showing smetic C phase.
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