Reaction with resorcinol

Analytical Methods. A method has been described for gas chromatographic analysis of trichloromethanesulfenyl chloride as well as of other volatile sulfur compounds (62). A method has been recommended for determining small amounts of trichloromethanesulfenyl chloride in air or water on the basis of a color-forming reaction with resorcinol (63). 

Glucose phosphate isomerase 5.3.1.9 Glucose-6-phosphate Fructose-6-phosphate Reaction with resorcinol... 

For the diazocoupling reaction with resorcinol and 4-nitrobenzene diazonium, see Coffey S, ed. Rodd s Chemistry of Carbon Compounds. Vol. 3, Part C. New York Elsevier Scientific, New York, 1973 136 and references cited therein. 

The reaction with resorcinol at pH 11 was run in solvent systems containing 50%, 67%, and 100% water. The degree of substitution was measured as described below to determine the effect of dioxane on the condensation. After 6 hours at 100 °C, the degree of substitution was 16% lower in dioxane-water (1 1) and only 2% lower in dioxane-water (1 2) than in water. 

As was observed in reactions with resorcinol, the 13C-NMR spectra showed... 

Diazooxides react with hydroxyaromatic coupling components in the same manner as diazoniiun salts, giving dihydroxysubstituted azo compounds. An interesting feature of this reaction is the fact that the reaction rate incr with medium acidity, reaches a maximum (between 50-80% HjSO in reactions with resorcinol, depending on the diazooxide under study) and then decreases... 

Calixarenes are macrocyclic molecules synthesized with high yield by condensation of appropriate arenes and aldehyde derivatives. Calix means bowF in Latin and Greek, and this phrase reflects the shape of the tetramer, which usually adopts a bowl or beaker-like conformation. Gutsche first introduced the name calixarene for this class of compounds [38]. Several authors have exhaustively reviewed the chemistry and synthetic procedures, which lead to different structural modifications of calixarenes [39-42]. In general, three types of calixarenes derivatives are known first, metacyclophanes (type 1) second, those obtained by condensation of formaldehyde with phenol (type 11), and third, those obtained by reaction with resorcinol (type III) (Scheme 6). The latter modifications are also called resorcarenes to distinguish calixarenes of type III from those of type II. 

Both of these curatives are added in the lower temperature, final mixing stage. HMTA must be isolated from the other rubber curatives during storage and batch preparation since its basicity can cause premature decomposition of the rubber cure accelerators and can accelerate the conversion of insoluble sulfur into the soluble form. The structure of HMTA and the reaction with resorcinol are illustrated in Scheme 4.1. Classical chemical studies indicate that as much as 75% of nitrogen remains chemically bonded to the rubber though some ammonia is released during the cure of the resin and the rubber, which can have detrimental effects on rubber composites reinforced with brass coated steel cords. 

A DCL of short polymers has been generated from the condensation of resorcinol and 1,4-butanedial (Scheme 1.11) [41]. Resorcinol and 2,5-dimethoxytetrahydro-furan (3.3 equiv.) were combined in ethanol at 80 C in the presence of HCl. Acid-catalyzed decomposition of the 2,5-dimethoxytetrahydrofuran led to the formation of 1,4-butanedial. Each aldehyde then underwent two condensation reactions with resorcinol to form ladder-like polymers containing calixarene moieties under thermodynamic control. 

Unlike the reaction of nitrous acid with p-cresol, the product of a similar reaction with resorcinol, has been proved< > without doubt, by comparison with 2,4-dinitrosoresorcinol, to be the nitroso-compound. The procedure is ... 

A test for the detection of fructose in urine, based on its reaction with resorcinol in hydrochloric acid to give a red colour. 

The phospha-Mannich condensation of a-, (3- and y-amino acetals, paraformaldehyde and secondary phosphine oxides led to a),(i)-dialko g -all laminomethylphosphine oxides whose reaction with resorcinols or pyrogallol in boiling trifluoroacetic acid afforded (diallg lphosphinoyl-methyl-)(o),a)-diaiylallgrl)ammonium trifluoroacetates (Scheme 41). ... 

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