Looking to market segments, aromatic ketone
polymer is the fastest-growing type of high-performance plastic in terms of volume and value.
Keywords: 1,4-bis (triphenylphosphonium)butane cerium nitrate; Alkyl-substituted benzene; Aromatic aldehyde; Aromatic ketone
; Oxidation; Triphenylphosphine.
In the IR spectrum, the key structural features include the following absorptions: aromatic C--H, 3065 [cm.sup.-1], aromatic ketone
C=O, 1644 [cm.sup.-1], and aromatic ether Ar--O--Ar, 1266 [cm.sup.-1].
As expected, the [R.sup.2] values then improved significantly ([R.sup.2] and P values = 0.8717 and 2.10R - 03 (haloalkane, n = 7), 0.8518 and 5.12E - 05 (aromatic, n = 11), 0.9963 and 3.87R - 02 (ketone, n = 3), 0.9243 and 5.50R - 04 (aromatic ketone
, n = 7), and 0.8929 and 2.12E - 01 (phthalate, n = 3)).
By contrast, valerophenone, an aromatic ketone
, photolyzed at a similar rate in both methanol and aqueous NS-CAL solutions.
The polyimides II A and II B display aromatic ketone
absorbance in the IR region at 1670 [cm.sup.-1] characteristic of a carbonyl group bonded to two aromatic rings.
The dominant features of the C k-edge spectra include: (1) quinone and diene C at 284.5 eV, (2) aryl and olefinic C at 285.2 eV, (3) unsaturated C at 286.1 eV, (4) phenolic (aromatic C connected to O group (COH) in phenols) and ketonic C (carbonyl substituted aromatic structures of quinones, phenols and ketones) at 286.7 eV, (5) aliphatic and carbonyl C (carbonyl functionalities from aromatic ketones
) at 287.7 eV, (6) carboxylic C, carbonyl C in carboxylic acids, aromatic alcohols and polysaccharide structures at 288.4 eV, (7) O-alkyl C (e.g.
Its seeds have pungent peppery taste due to aromatic ketones
SLTCT involves aliphatic ketones ranging from [C.sub.10] to [C.sub.29], and minor aromatic ketones
, the relative content of neutral fraction 5 being 16.64%.
Acetophenone yields more Pinacol indicating that aromatic ketones
are more prone to the formation of the Pinacol.
Alkoxyl and peroxyl free-radicals produced from the reaction of oxygen and lignin free-radicals react with the phenoxyl free-radical formed to produce colored chromophores, e.g., quinoides, aromatic ketones
, aldehydes, and acids as photodegradation products.