Phenolate-tris

The hydrolysis of phosphites is retarded by the addition of a small amount of a base such as triethanolamine. A more effective approach is the use of hindered phenols for esterification. Relatively good resistance to hydrolysis is shown by two esters derived from hindered phenols tris(2,4-di-/ / butylphenyl)phosphite [31570-04-4] (25) and tetrakis(2,4-di-/ /f-butylphenyl)4,4 -biphenylenediphosphonite [38613-77-3] (26). The hindered fluorophosphite [118337-09-0] (27) has excellent resistance to hydrolysis. 

With 3-methylphenol (meto-cresol), around 8 % of dibromo products result when one equivalent of brominating agent is used, and this rises to 23 % of dibromo products on attempted monobromination of 3,5-dimethylphenol with 1 molar equivalent of resin. Nevertheless, the good yields of products obtained from the mono-substituted phenols tried demonstrate that this is a powerful new synthetic method for the organic chemist. 

Copper Picrate will be described as Phenol, Tri-nitro, Copper Salt... 

Phenol (Tris-saturated)—Add 500 ml of liquefied phenol to 500 ml of 0.5 M Tris HC1, pH 8.0. Gently but thoroughly mix the solution for 15 min. Allow the two phases to separate, and aspirate off as much of the aqueous (upper) phase as possible. Repeat this extraction two more times with (500 ml per extraction) with 100 mM Tris HC1, pH 8.0. After the final extraction, leave a sufficient layer of Tris HC1, pH 8.0, over the equilibrated phenol. Store this solution in a tightly capped dark bottle at 4°C (stable for several weeks). 

The final step in a recent synthesis of the antifungal agent Papulacandin D involved deprotection of five O-silyl groups including a di-ferr-butylsilylene group, a triethylsilyl ether and two phenolic tri-isopropylsilyl ethers [Scheme 3.115],215 Acid conditions were precluded by the add lability of the side chain. Use of TBAF was complicated by problems in separating the product from tetrabuty-Lammonium salts. The desired global deprotection was accomplished with tris-(dime thy iamino)sulfoni urn difluorotrimethylsilicate (TAS-F). 

Addition of an equal volume of phenol-Tris-HCl pH 7.5 (commercially available ready to use solution) and agitation at 4 °C for 1 h... 

Organophosphites are secondary antioxidants which reduce hydroperoxides to alcohols. They inhibit the discolouration reaction experienced by phenolics. Tris-nonyl phenyl phosphite (TNPP) is the most commonly used. The disadvantage of phosphates is their high hygroscopicity. Thioesters act as secondary antioxidants by destroying hydroperoxides to form stable sulphur derivatives. In addition, thioesters impart high heat stability to polyolefins, polystyrene and its copolymers. The m or disadvantage of thioesters is their unpleasant odour which is transferred to the host polymer. 

Tris (dimethylaminomethyl) phenol Tri (dimethylphenyl) phosphate. See Trixylenyl phosphate... 

Ethylenebis (tetrabromophthalimide) Ethylene diamine phosphate Pentabromotoluene Sodium antimonate Tetradecabromodiphenoxybenzene flame retardant, PET Pentabromobenzyl acrylate Polypropylene/dibromostyrene copolymer Tetradecabromodiphenoxybenzene Tetrakis (2-chloroethyl) ethylene diphosphate flame retardant, phenolic resins 1,4-Diisobutyl-1,4-diphosphoryl-2,3,5,6-tetrahydroxycyclohexane flame retardant, phenolics Tris (2,3-dichloropropyl) phosphate flame retardant, pigment carriers Triaryl phosphate... 

Methyl alcohol formaldehyde scavenger Aminoethyl propanediol formaldehyde scavenger, curing phenolics Tris (hydroxymethyl) aminomethane formaldehyde source... 

Phenol is an alcohol in which OH is bonded to a benzene ring. Use fragments from Schemes 5.1 and 5.6 to generate all the possible monophenols and diphenols. Is there anything interesting you can say about phenols (try searching on the Web) ... 

Polyamine and organic acid anhydride hardeners serve as co-reactive hardeners, which become incorporated into the epoxy resin, whereas tertiary amines, such as 2,4,6-tris-(dimethylaminomethyl)phenol (tris-DMP) and N,N-dimethylbenzylamine, imidazoles, and boron trihalide amine complexes are catalyst-type curing agents, which may not be chemicaUy bound to the resin molecules during epoxy curing reactions (Guin and Work 1995 Muskopf and McCoUister 1987). 

Cyanoethyl-2-phenyl-4,5-di(cyanoethoxymethyl)imidazole Dimethylaminomethylphenol [25338-55-0] 2,4,6-Tris-(dimethylaminomethyl)phenol (tris-DMP)... 

An NADH diaphorase has been purified from human erythrocytes. The enzyme activity can be determined in a system containing 2.6 dichlorophenol-indo-phenol, Tris HCl buffer (pH 7.55), EDTA, and the enzyme. The reduction of 2.6 dichlorophenol-indo-phenol is followed spectrophotometrically. The purified enzyme contains one mole of a flavin adenine nucleotide (probably FAD) per 195,000 g of protein. The enzyme functions with either NADPH or NADH as hydrogen donor, but the affinity for NADH is almost 10 times greater than that for NADPH. 

The reaction between liquid polysulfide polymers and epoxies is catalyzed by organic amines, for example, dimethylamine methyl phenol, tri-dimethylami-nomethyl phenol, diethylenetriamine, and benzyldimethylamine. The reaction of liquid polysulfide polymer with an epoxy resin and a primary amine is... 

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