- Syntheses of 6-Amino-1,3-benzodioxin and Its p-Arylazo-Substituted Calixarenes
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The p-arylazo-substituted calixarenes were synthesized by a diazo-coupling reaction between calixarene and the diazonium salt of 6-amino-1,3-benzodioxin.The monoarylazo-, 1,2-diarylazo-, 1,3-diarylazo-, triarylazo-, and tetraarylazo-para-substituted calixarenes were isolated and characterized by spectral methods. 6-Amino-1,3-benzodioxin was prepared by palladium metal reduction of 6-nitro-1,3-benzodioxin.
- Yeh, Mei-ling,Tang, Fa-shin,Chen, Shu-ling,Liu, Wen-chin,Lin, Lee-gin
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p. 754 - 757
(2007/10/02)
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- Oxidative hair dyeing compositions based on 4-aminophenol derivatives and new 4-aminophenol derivatives
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Compositions for oxidative dyeing of hair based on 4-aminophenol derivatives of the formula (I): STR1 or their physiologically compatible water soluble salts, wherein R is selected from the group consisting of alkyl groups with from one to four carbon atoms, monohydroxyalkyl groups with from two to four carbon atoms, aminoalkyl groups with from two to four carbon atoms, aminoalkyl groups having amino groups substituted with from one to two alkyl groups having from one to four carbon atoms and dihydroxyalkyl groups with from three to four carbon atoms. New developer substances include 4-amino-2-propoxymethyl phenol, 4-amino-2-isopropoxymethyl phenol and 4-amino-2-(2'-hydroxyethoxymethyl)-phenol. The developer substances of the formula I have physiologically improved properties with equally good dyeing properties as the p-aminophenol used up to now in the red region of the spectrum.
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- Heterocycles dioxinniques. Nouvelle methode de synthese des benzo (4H) dioxinnes-1,3
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The condensation reactions between variously substituted phenols and paraformaldehyde were carried out in the presence of ion exchangers used as catalysts.The control of the hydration rate of the reaction medium afforded the selective formation of the corresponding 4H-benzo-1.3-dioxins.
- Denis, Alain,Delmas, Michel,Gaset, Antoine
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p. 517 - 519
(2007/10/02)
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