Fully substituted 3-fluorooxindoles containing vicinal fluoroamine motifs have been synthesized through organocatalytic Mannich reactions of 3-fluorooxindoles.
Ultra-thin freestanding polyimide(PI) films of 100 nm thickness were formed by sequential evaporation of 4,4'-diaminodiphenyl ether(ODA) and pyromellitic dianhydride(PMDA) precursor monomers followed by a thermal treatment of 150 ℃ 1 h and 350 ℃ 2 h.The chemical structures of the PI films were investigated using FTIR spectroscopy and the degree of imidization was calculated.Results show that the PI film has a fully imidization.The surface morphology of the films,compared with co-deposited PI films,was observed using AFM,the surface morphology of the PI films would be better by depositing ODA first.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Enantioselective Friedel-Crafts alkylation of indole with α,β-unsaturated aldehyde was catalyzed by camphor sulfonyl hydrazine (CaSH) with good enantioselectivity (81-88%).
Cu(NO 3 ) 2 .3H 2 O was demonstrated to be an efficient, regioselective and inexpensive nitrating reagent for the synthesis of mono-nitro substituted phenolic compounds.12 examples of different phenols were examined.Good yields (67-90%) have been achieved.
N-heterocyclic carbene borane (NHC-borane) based on a triazole core is demonstrated for the first time to be efficient for reduction of a variety of tert-butanesulfinyl ketimines. Up to 95% yield and up to >99% diastereomeric excess were achieved. NHC-borane exhibited excellent activities that are more efficient than or comparable to commonly used reductive reagents such as NaBH4, NaBH3CN, l-selectride, Ru catalyst, or BH3–THF.
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