Imides


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Imides

 

compounds having two acyl groups linked to an NH group. Open chain and cyclic imides are known. The latter are the most important ; they are derivatives of dibasic acids, for example, phthalimide (I; melting point, 233.5°-238°C), succini-mide (II; melting point, 125°-127°C), and the imide of o-sul-fobenzoic acid (III; saccharin, melting point, 226°-230°C):

Cyclic imides are obtained by the action of ammonia on the anhydrides of dibasic acids or by the heating of various derivatives of these acids, for example, ammonium salts or amides. Unlike amides, imides are quite devoid of basic properties and are weak acids. The hydrogen atom in the imino group is easily replaced by an atom of a metal or halogen. The metal salts and N-bromo derivatives of cyclic imides (for example, potassium phthalimide, N-bromosuccinimide) are widely used in organic synthesis. [10–417-1 ]

References in periodicals archive ?
Overall, SMA imide resins are versatile chemicals with intrinsic properties that can be used under diverse conditions.
It is notable that BPOB-5 has higher orientation than BPOB-1, which can be explained by the fact that hydrogen bonding between the BIA and cyclic imide units restricts the flexibility of the polymer chain and the disorientation.
1], which are commonly attributed to the asymmetrical and symmetrical stretching vibrations of carbonyl groups of imide rings; absorption band at 1368 [cm.
The decrease ratio of the peak corresponding to the imide bonds was used based on the peak intensity corresponding to the C-F bond because the bond number of C-F did not change before and after the reaction.
The imide content is calculated from the ratio of imide-related bands (1765 [cm.
The FT-IR spectra of copolymer CNPAM is shown absorption band of the C = C of imide ring at 948[cm.
It helps us to monitor the decomposition (relationship between amide/imide bonds) and the orientation (relationship between imide bonds) after corona aging.
At low temperature range, during First scan, there was relaxation [gamma] correlated most probably with the phenyl or imide rings motions strongly influenced by moisture absorption content [38].
0, and moreover, establish relationship of draw ratios and formation of the interaction, we have calculated ratio value, defined as distance of two adjacent imide rings to draw ratio, as shown in Table 2 and Fig.
h] exhibited characteristic absorption bands for the imide ring at 1778, 1724 (asymmetrical and symmetrical C=O stretching vibration), 1373 (C-N stretching vibration), 1088, and 746 [cm.
Upon further temperature rise ([greater than] 180 [degrees] C) product (B) is transformed into an imide.