Cyclocondensation of nitromalonaldehyde sodium salt with substituted 1-amino-3-butanones afforded 2-dimethyl-, diethylaminomethyl-4-nitrophenols and 2-piperidylo-, morpholylomethyl-4-nitrophenols.
The three-component addition of isocyanides to phenol derivatives and aldehydes proceeds easily in methanol to form O-arylated compounds in a new Passerini-type reaction. The key step of the conversion lies in an irreversible Smilesrearrangement of intermediate phenoxyimidate adducts. It represents the first use of a Smilesrearrangement in a Passerini reaction. [reaction: see text]
phenols were prepared and investigated by 1H and 13C NMR spectroscopy in chloroform-d1 solution. The chemical shifts of intramolecular hydrogen-bonded protons in Mannich bases depend on the pKa of the parent phenols. A correlation between Hammett's constants, σp, and 13C NMR chemical shifts of para carbon atoms has been found. All the results obtained from 1H and 13C NMR spectra show that in the case
The influence of steric and polar effects on hydrogen bonding in 2-(N,N-diethylamino)-methyl-4-NO2-phenols
作者:A. Filarowski、A. Koll、T. Glowiak
DOI:10.1007/bf02576550
日期:1997.12
structures consisting of 2-(N,N-diethylamino)-methyl-4-NO2-phenol molecules were determined. In the triclinic crystals (with a=9.527(2) Å,b=11.268(3) Å,c=11.408(3) Å, α=87.80(3)o. β=69.62(3)o, γ=81.82(3)o, Z=4, space groupPĪ) asymmetric cyclic dimers were found, formed by two nonequivalent O−…H−N+ hydrogen bonds of 2.614(3) and 2.660(3) Å lengths. In the complex of 2-(N,N-diethylamino)-methyl-4-NO2-phenol