cyclic anhydride

cyclic anhydride

[′sīk·lik an′hī‚drīd]
(organic chemistry)
A ring compound formed by the removal of water from a compound; an example is phthalic anhydride.
References in periodicals archive ?
Besides forming the amide-acids, reaction between cyclic anhydride groups of MAn and amine groups of ATA can also undergo ring closure to form imide, resulting in a loss of hydrogen bonding [1], However, from this study, there is no band at 1770 [cm.
Cyclic anhydride and protonated amide functional groups were identified as reaction intermediates, which resulted in carboxylic ester linkages between MSO and cellulose upon elevated temperature curing.
Further, DRIFTS analysis facilitated detection of ester groups: produced via reaction of cyclic anhydride and protonated amide intermediates with cellulose hydroxyl groups.
1] which are assigned to the absorption of the carbonyl group of cyclic anhydride do not appear.
Cavitt, TB, Photoinitiation of Free-Radical Polymerization by Aryl Disulfide, Cyclic Anhydride, and Phthalimide Derrivatives: ProQuest Information and Learning Company, Ann Arbor, MI (2002)
It contains a compound comprising hydroxylamide groups characterized in that at first a compound comprising hydroxyalkyl amide units and carboxylic acid units is obtained by reacting a cyclic anhydride and an alkanolamine in a mixing device and that secondly the binder composition is obtained by mixing the compound and a polymer in a second mixing device.
1], which correspond to asymmetric C=O stretching and symmetric C=O stretching in the cyclic anhydride (33), respectively, mean that MAH molecules have been grafted successfully onto DP macromolecular chains.
g] ranging from 148 to 153[degrees]C because it is of more rigid structure, originating from cyclic anhydride in the main chains of the alternating copolymer.
1] (which are characteristic absorptions for cyclic anhydride groups) have been found, which indicate the presence of MA units in the iPP-g-MA copolymer.
1] can be assigned to grafted anhydride because five members cyclic anhydrides exhibit intense absorption bands near 1780 [cm.
The films were then dried in a vacuum oven at 55[degrees]C for 12 hrs to allow complete cyclization of any diacid into the cyclic anhydride form.
A kinetic model involving an association of the cyclic anhydride (CAn) group with several alcohol groups had been proposed by Ratzsch and Wohlfahrt (4), although a classical approach was sufficient to explain the experimental results obtained by Hu and Lindt (11).

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