Tetra-carboxylic acids

Phosphorodithioic acid 0,0 -dialkyl ester (dialkyldithiophosphoric acid) 

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The PBI molecules studied include pyridyl-(P-PBI), terpyridyl (TP-PBI), and thiol-terminated (T-PBI) perylene-3,4 9,10-tetra-carboxylic acid bisimides, that contain bulky ferf-butylphenoxy substituents at 1,6,7,12 bay positions, and pyridyl-(Py-PBI) and terpyridyl- (TPy-PBI) terminated perylene-3,4 9,10-tetra-carboxylic acid bisimides, that contain bulky pyrrolidinyl substituents at 1,7 bay positions (Fig. 26a) [327-329]. 

There is one triplet and one quadruplet correlation. The third isomer, 1,2,3,5-tetra-carboxylic acid, will have three different intrinsic binding constants (at positions... 

Perylene, a parent pentacyclic aromatic compound, which exhibits a strong fluorescence has found application in laser dyes and organic light emitting diodes (see section 3.8.5.1). The esters of di-, tri- and tetra-carboxylic acids of perylene are lightfast, yellow to red fluorescent chromophores, exemplified by the diisobutyl ester of the... 

Ethane-tetra-carboxylic Acid Tetraethyl Ester, with iodine, then in 1924 by reducing ethene-tetracarboxylic acid tetraethyl ester witb a seven-fold excess of aluminum amalgam for two hrs at 50—60° in 95% ale (Ref 11)... 

Figure 14.5. Two-step acylation reactions that generate poly(amic acid) from diamine and tetra-carboxylic acid dianhydride (reproduced by permission of the American Chemical Society, from Ando...

Scheme 15.1 The honeycomb self-assembled network formed between tetra-carboxylic acid diimide 15.1 and melamine (15.2).

Mashazi PN, Ozoemena K I, Maree DM, Nyokong T (2006) Self-assembled monolayers (SAMs) of cobalt tetra carboxylic acid chloride phthalocyanine covalently attached onto a preformed mercaptoethanol SAM A novel method. Electrochim Acta 51(17) 3489—3494... 

Crownpak CR(+). Chiral separation of gemifloxacin was performed in analytical counter-current chromatography using (- -)-(18-crown-6)-tetra-carboxylic acid as CSP. A successful separation of gemifloxacin enantiomers could be achieved using a two-phase solvent system composed of 1-butanol-ethyl-acetate-bis(2-hydroxyethyl)amino tris (hydroxymethyl)methane acetate buffer with a small amount of CgH4 [19]. 

R. Koner, 1. Goldberg, Crystal engineering of molecular networks hydrogen bonding driven two-dimensional assemblies of tetrapyridylporphyrin with benzene tri- and tetra-carboxylic acids, CrystEngComm 11 (2009) 1217-1219. 

Of particular interest are the ladder polytriazoles formed from bisamidrazones with di-and tetra-carboxylic acids or bisbenzoxazinones, e.g. Scheme 149. Such polymers derived from napththoic acids have a high average molecular weight, high thermal resistance and good resistance to wear. 

Another example is the Friedel-Crafts phosgene reaction with 0.xylene giving 3,3, 4,4 -tetramethylbenzophenone in high yield and free of isomers (Ref. 14). This substituted benzophenone is easily oxidized into benzophenone tetra-carboxylic acid dianhydride (BTDA) widely used for the manufacture of polyimides [Scheme 18] ... 

Fig. 7.18 Chiral crown ethers employed as chiral selectors in CSPs for liquid chromatographic enantiomer separation. (A) (3,3 -diphenyl-l,T-binaphthyl)-20-crown-6 employed in coated CSPs. (B) (18-crown-6-2,3,ll,12)-tetra-carboxylic acid used forthe preparation of immobilized CSPs.

The same type of behavior is observed with Moo-Pim leading to the possibility of two frozen arrangements. The H NMR study allowed to evidence, between 226K and 336K, the fluxionality of Moio-Glu " and (Mon-Pim) in contrast to the rigidity of Mog-Ox ". Replacing the alkyl carboxylic acid by an aromatic tri- or tetra-carboxylic acid blocks the motions in the wheel. 

Ozonation of benzo[r,s,t]pentaphene (7) followed by oxidative workup led to benzo[r,s,t]pentaphene-5,8-dione (12) (14%), phthalic acid (13) (4%), p-terphenyl-2,2, 3, 2"-tetra-carboxylic acid-2, 3 -anhydride (14) (10%), and 2-(o-car-boxyphenyl)- ,10-phenanthrenedicarboxylic acid anhydride (15) (3%), with a 56% recovery of unreacted 7, Ozonation of pentaphene (11) led to a peroxidic mixture which on oxidative workup led to 2,2 -binaphthyl-3,3 -dicarboxalde-hyde (16) (16%), 2,2 -binaphthyl-3,3 -dicarboxylic acid (17) (16%), and 13 (2%), with a 28% recovery of unreacted 11. A comparison of the reactivity to ozone of carcinogenic polycyclic aromatics benzo c]phenanthrene (1), 7,12-di-methylbenz [a] anthracene (2), 3-methylcholanthrene (3), dibenz[si,]] - (4), and dibenzlsi, ]anthracene (5), benzo Si -pyrene (6) and 7, and the noncarcinogen 11, all determined in our laboratory, leads us to conclude that there is no simple, consistent correlation between carcinogenicity, K-and L-region additivity towards ozone and the Pullmans electronic theory of carcinogenesis. 

Figure 7-7. Crystal structure of 40, a two-dimensional lamella of Ni(II) and tetra-carboxylic acid, b three-dimensional structure with vacancies oceupiedby water molecules.

A monomer mixture composed of an ester of benzophenone tetra-carboxylic acid and a polyamine, with a content of 9% volatiles is heated to a critical temperature at which foaming occurs contemporaneously with polymerization of the tetracarboxylic and polyamine components until the PI foam is formed. ... 

A very wide range of di-, tri- and tetra-carboxylic acids have been used in the synthesis of MOFs. Selected examples are shown in Figure 2.29, but a more... 

An arylboronic acid bearing bulky l-(2,2,6,6-tetramethylpiperidinyl)methyl groups at the 2,6-positions can catalyse the conversion of di- and tetra-carboxylic acids to their... 

Mellophanic Acid Benzene-1 2 3 f)-tetra-carboxylic acid)... 

Metallo phthalocyanine units as dye components are fixed on lyotropic liquid crystalline systems based on poly(y-benzyl-L-glutamate). Phthalocyanines are introduced onto the liquid crystalline backbone of poly(y-benzyl-L-glutamate) as shown in Figure 17.13 via a Friedel-Crafts reaction of acid chloride of phthalocyanine tetra-carboxylic acid with the parent polymer [212]. Reactive metallo mesogens of the structure... 

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