Dicarboxylic acid salt

Many other reactions have been reported for the synthesis of polyesters, such as reactions between dicarboxylic acid salts and dialkyl halides, reactions between... 

Stephanou EG (1992) a,cd-dicarboxylic acid salts and a,co-dicarboxylic acids. Photooxidation products of unsaturated fatty acids, present in marine aerosols and marine sediments. Naturwiss 79 28-131. 

J. W. Darden and E. E. McEntire. Dicyclopentadiene dicarboxylic acid salts as corrosion inhibitors. Patent EP 200850, 1986. 

Recently, treatment of the esters or amides of l-methylpyridinium-3,5-dicarboxylic acid salts with an alkanethiol and TEA in methylene chloride was found to give a mixture of dihydropyridines (Scheme 77) (80CC1147). These yellow adducts are particularly useful as thiolate transfer agents. Excellent yields of thioesters, for example (133), are formed by the reaction of the adducts with activated acid derivatives. 

The world-wide production of PA (excluding fibers) in 1997 was 1.6x10 t, with a 75 % use of casting processed materials. For food contact articles the following can be used as starting materials straight chain u -amino acids (C6-C12) and their lactams adipic acids, azelaic acids, sebacic acids, dodecane dicarboxylic acids and heptadecane-dicarboxylic acids salts with hexamethylenediamine isophthalic acid, bis(4-aminocy-clohexyl)-methane, 2,2-bis(4 -aminocyclohexyl)-propane, 3,3 -dimethyl-4,4 -diamino-dicyclohexyl-methane, terephthalic acid or its methylester, l,6-diamino-2,2,4-tri-methylhexane, 1,6-diamino-2,4,4-trimethylhexane, l-amino-3-amino-methyl-3,5,5-tri-methylhexane. 

Classification Dicarboxylic acid salt Empirical C2H8N2O4 C2H8N2O4 H2O Properties Colorless cryst. odorless sol. in water si. sol. in alcohol insol. in ammonia m.w. 124.1... 

Ciassification Dicarboxylic acid salt Empiricai C2Na204 Formuia NaOCOOCONa... 

Emulsion Silanol ended oligomer or cyclic dimethylsiloxanes Sodium silicate, tin dicarboxylates acid salt hydroxides of alkali metals 7 ( Co) (16-18)... 

A further note concerns the rapidity of precipitate formation. Precipitation was believed to be the molecular weight limiting factor for the condensation of the uranyl ion with dicarboxylic acid salts. Since precipitation is so rapid, it is possible that precipitation of the polymer is the limiting factor for uranyl uptake for the present system. 

Several special dicarboxylic acid salts were used to produce both fer-rocene and cobalticinum-containing polyesters. Ferrocene reactions to produce structure 9, were studied as a function of pH. The pK q for 1,1 -ferrocenedicarboxylic acid (FDCA) is not known but should be near 6.8. ... 

Jin Y, Hiltnet A, Baer E. Effect of an organic dicarboxylic acid salt on fractionated crystallization of polypropylene droplets. J Appl Polym Sci 2007 105(6) 3260-73. 

Syntheses of aliphatic polyesters and polyamides by 02 + 2 polycondensations in the melt were first studied by Carothers in the years 1930-1937 (see Chap. 3). Since that time Nylon-6,6 type aliphatic polyamides were and are prepared from equimolar monomer mixtures usually supplied in the form of diamine-dicarboxylic acid salts. In the case of aliphatic polyesters two different procedures are applicable, depending on the volatility of the reaction partners. Combinations of low boiling esters such as dimethyl succinate and low boiling dieols (e.g., ethanediol) are best polymerized in equimolar feed ratios Equimolar feed ratios are again advisable for combinations of long a,m-alkanediols and dicarboxylic acids or their... 

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