Imides s. Dicarboxylic acid

Imides s. Dicarboxylic acid imides, Sulfimides Imidines s. Phthalimidines N-Imidoylethylenimines... 

Virtually any of the traditional methods outlined to prepare polyamides, particularly aromatic polyimides, has readily been used for the synthesis of poly(amide imide)s from diamines or diamine derivatives and imide-containing dicarboxylic acids or acid derivatives (Scheme 35). 

R) - and (S)-l-phenylethylamine to the diethyl esters of fumaric and maleic acid which are carried out by heating the pure compounds, without solvent, to 115-120 °C for three days (see Table 1). The reaction mixtures are then hydrolyzed and hydrogenated to give aspartic acids in high yields (85-87%) but very low optical purities (6.3-12.2%). A number of intermediates and by-products arc isolated, especially amides and imides of the dicarboxylic acids participating in the reaction. This may explain the low overall diastereoselectivity which can be calculated from the low optical rotation of the isolated aspartic acids. However, any discussion of the reaction mechanism remains difficult because the structures of the substrates and products of the actual addition step itself are not known with certainty. It is known that... 

Kricheldorf has reported the synthesis of lyotropic poly(amide-imide)s and poly(benzoxazole-amide)s. These were prepared by the polycondensation of N,N-bis(trimethylsilyl)-p-phenylenediamine or N,AT -bis(trimethylsilyl)-3,3 -dim-ethylbenzidine with the diacyl chloride of trimellitimide of p-aminobenzoic acid, or the imide formed from p-amino benzoic acid and terephthalic acid. Lyotropic behaviour was observed in cone, sulphuric acid solution [38]. A series of thermotropic poly(imide-amide)s was prepared based on trimellitimides formed from trimellitic anhydride and an a, -bis(4-aminophenoxy) alkane with carbon chain lengths 9-12. Melting points were in the range 250-300 °C. They formed smectic A phases and tended to degrade around the isotropisation temperatures (around 350 °C). Pendant methyl groups or occupied meta- groups tended to prevent mesophase formation [39]. Novel LC poly(imide-amides) have also been synthesised from new diamine spacers derived from linear diaminoalkanes and 4-nitrophthalic anhydride. A smectic and nematic phase were observed when 4,4 -biphenyl dicarboxylic acid was used as co-monomer [40]. 

Table 23 demonstrates the mesogenicity of polymers containing biphenylene-S j -tetracarboxylic imide. A comparison of series 9 and 10 in the table shows that replacement of pyromellitic dianhydride with BPTA in a copolymer with two moles of m-aminophenol and an aromatic diacid does not lead to mesogenic polymers. The assignment of an MI score of 4 compared to 2 for pyromellitic anhydride does however raise the MI as far as the borderline condition of MI=9.5 when 2,6-naphthalene dicarboxylic acid is the co-monomer. 

Dicarboxylic acid monoamides from carboxylic acid imides s. 4,157... 

Abouzari-Lotf E, Shockravi A, Javadi A. Heat-resistant and soluble fluorinated poly(amide imide)s based on non-coplanar ortho-linked diimide-dicarboxylic acid. Polym Degradation Stability 2011 96(5) 1022-8. 

Thianthrenium (thianthrene-2,3-dicarboxylic imide-S-methoxybenzene trifluoromethylsulfonate) is decomposed by UV light to produce acid, as shown in Equation (2.2) ... 

Dicarboxylic acid amide hydrazides from imides s. 44, 383 G... 

C.P. Yang, YY Su, M.Y. Hsu, Syntheses and properties of fluorinated polyamides and poly(amide imide)s based on 9,9-bis [4-(4-amino-2-rifluromethylphenoxy) phenyl] fluroene, aromatic dicarboxylic acids, and various mono-trimellitimides and te-trimellitimides. Colloid Polym. Sci. 284 (9) (2006) 990-1000. 

Cobalt carbonyl Dicarboxylic acid imides from ethylenecarboxylic acid amides s. 19, 777... 

N-Halogenimides s. N-Halogeno-dicarboxylic acid imides N-Halogenimines s. N-Chlorimines... 

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