## Abstract Possibilities to synthesize substituted oligo[(hydroxy‐1,3‐phenylene)methylene]s containing hydroxynitrophenylene and alkylhydroxyphenylene units are discussed. The only successful way to introduce the hydroxynitrophenylene unit consists in the condensation of chloromethylated nitrophen
Die kristallstruktur von oligo[(2-hydroxy-1,3-phenylen)methylen]en
✍ Scribed by Paulus, Erich ;Böhmer, Volker
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1984
- Weight
- 677 KB
- Volume
- 185
- Category
- Article
- ISSN
- 0025-116X
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✦ Synopsis
Abstract
The crystal structure of three tetranuclear phenolic compounds – 6,6′‐bis (2‐hydroxy‐5‐methylbenzyl)‐4,4′‐dimethyl‐2,2′‐methylenediphenol (1), 6‐(2‐hydroxy‐3,5‐dimethylbenzyl)‐6′‐(2‐hydroxy‐5‐methylbenzyl)‐4,4′‐dimethyl‐2,2′‐methylendiphenol (2), and 6‐(3‐tert‐butyl‐2‐hydroxy‐5‐methylbenzyl)‐6′‐(2‐hydroxy‐5‐methylbenzyl)‐4,4′‐dimethyl‐2,2′‐methylene‐diphenol (3) –, was determined by single crystal X‐ray analysis. Intramolecular hydrogen bonds between all hydroxyl groups of adjacent phenolic units are found for all molecules. They are directed to the opposite end of the molecule by the ortho‐methyl or ortho‐tert‐butyl group in compounds 2 and 3, while no special orientation is found in 1. The conformation of the phenolic units is trans/trans (anti/anti) in 1 and cis/trans (syn/anti) in 2 and 3. Consequently, in the crystal lattice, 2 and 3 form cyclic dimers via intermolecular head‐to‐tail hydrogen bonds, while the molecules of 1 are arranged to chains of indefinite length by head‐to‐head and tail‐to‐tail hydrogen bonds.
📜 SIMILAR VOLUMES
## Abstract The structures of two homologous series of oligo[(2‐hydroxy‐1,3‐phenylene)methylene]s completely esterified with methacrylic acid, were spectroscopically analysed. The molar decadal absorption coefficients of ultraviolet absorption maxima of the two homologous series confirm Hunter's re
## Abstract Die ^1^H NMR‐Spektren von 51 Oligo(hydroxy‐5‐nitro‐1,3‐phenylen)methylen Verbindungen (17 Zwei‐, 18 Drei‐, 14 Vier‐ und 2 Fünfkernverbindungen) wurden in Pyridin als Lösungsmittel aufgenommen. Bei Verbindungen mit __ortho__‐Nitrophenolbausteinen zeigten die Signale für die Protonen der
## Abstract Es wird die Darstellung von Cyclo{tris[(2‐hydroxy‐5‐methyl‐1,3‐phenylen)methylen]‐(2‐hydroxy‐5‐__tert__‐butyl‐1,3‐phenylen)methylen} (**4a**), Cyclo{bis[(2‐hydroxy‐5‐methyl‐1,3‐phenylen)methylen]‐bis[(2‐hydroxy‐5‐__tert__‐butyl‐1,3‐phenylen)methylen]}(**4b**) und Cyclo‐{pentakis[(2‐hydr
## Abstract 4‐(1,1,3,3‐Tetramethylbutyl)phenol und 4‐Octylphenol, erhalten durch Friessche Verschiebung der entsprechenden Phenylester und anschließende Reduktion der Carbonylgruppe, wurden in ortho‐Stellung monobromiert und mit Formaldehyd hydroxymethyliert. Aus diesen Verbindungen konnten sechs 2