Hydrogen Bonding in Phenols

The interaction of novolak oligomers with hydrogen bond acceptors.

“…Cairns and Eglinton supported this interpretation by showing how closely the spectrum of the tetramer matches that of a calixarene [8]. The resonance stabilization in the tetramer is similar to that of the trimer structure does not require ionization.…”

“…There is no trace of the free phenol band in the spectrum of the tetramer (Figure 5a), and Cairns and Eglinton [8] recognized that this implies a closed ring structure, where all four hydroxyl groups are mutually hydrogen-bonded. Cairns and Eglinton supported this interpretation by showing how closely the spectrum of the tetramer matches that of a calixarene [8].…”

The pyridine vapor adsorption behavior and its influence on suppressing low-temperature cross-linking reactions during slow pyrolysis of lignite

“…In this section, the variation of different types of hydrogen bonds before and after pyridine vapor pretreatment were quantitatively studied based on our previous work, as well as the distribution and reduction of hydrogen bonds in coal. The peak assignments of hydrogen-bonded bands and the half-widths were determined based on the second differential of the spectrum and references or experiential formula [15,[25][26][27][28][29][30][31][32]. The coal spectrum was fitted by Peak Fitting Module included in the origin 7.0SRO.…”

Darstellung und spektroskopische analyse von oligo{[4‐(1,1,3,3‐tetramethylbutyl) (bzw. 4‐octyl)‐2‐hydroxy‐1,3‐phenylen]methylen}en und ihrer Ausgangsverbindungen

“…Dieses Signal ist bei 3d und 3e aufgespalten. 1,3,pht.rzol: 3 log ( 2 1,5 mol) 4-TMB-Phenol wurden in 800 cm3 I ,2-Dichlorathan gelost, die Losung rnit Eis gekiihlt und unter Riihren wahrend 2 bis 3 h 2888 ( 2 1,8 mol) Brom zugetropft. Nach 10-20 h Stehen bei 20 "C und Abziehen des Losungsmittels wurde i. Vak.…”

“…[ (2-h!~drox~-1,3-phen~~len)inerh~~lerieii] 4.5. Koiiderzsatioii der hroniierteri Octylphrnole niit Forinuldrhjd 6, I ,3, -2,2'-i~zethylendipheiioI (2a): In eine siedende Losung von 23 g (0,08 mol) 2- Brom-4-( 1,1,3,3-tetramethylbutyl)phenol in 40 cm3 Eisessig, zu der 1,8 g (0,06 mol) Paraformaldehyd gegeben war, lie8 man wChrend 15 min 4 cm3 konz. Schwefelsaure tropfen und hielt unter Ruhren wihrend 6 h die Badtemp.…”