Methylphthalate

The easy liberation of trifluoroethanol from 2,2,2-tnfluoroethyl hydrogen 3,6-di methylphthalate can be accounted for by nng closure to form 3,6 dimethylphthalic anhydride [57] (equation 56) The carboxylate anion is the intermediate needed for nng closure because the rate increases as the pH, while still acidic, increases... 

Fig. 27. CEC separation of a neutral test mixture at in mobile phases with different pH values. (Reprinted with permission from [ 148]. Copyright 2000 Elsevier). Conditions capillary column 100 pm i.d., total length 33.5 cm, active length 25 cm packed with 3 pm Waters Spherisorb ODS I, mobile phase (A) 4 1 acetonitrile-25 mmol/1 TRIS pH = 8 (B) 4 1 acetonitrile-25 mmol/1 phosphate, 0.2 % hexylamine pH = 2.5, voltage 25 kV, temperature 20 °C. Peaks thiourea (1), di-methylphthalate (2), diethylphthalate (3), biphenyl (4), o-terphenyl (5)... 

Other reagents used for the preparation of lactones from acid anhydrides are lithium borohydride [1019], lithium triethylborohydride (Superhydride ) [1019] and lithium tris sec-butyl)borohydride (L-Selectride ) [1019]. Of the three complex borohydrides the last one is most stereoselective in the reduction of 3-methylphthalic anhydride, 3-methoxyphthalic anhydride, and 1-methoxynaphthalene-2,3-dicarboxylic anhydride. It reduces the less sterically hindered carbonyl group with 85-90% stereoselectivity and is 83-91% yield [1019]. 

Other monoamic acids were investigated by p-NMR and the data are summarized in Table 17.2. A variety of complex phenomena was observed. For some cases, similar isomer compositions were seen in both NMP- and in CHCI, -prepared monoamic acids (compounds Ic and Ig), and in other syntheses, a reversal of the favored isomer was observed (compounds Id and le). Amoiuits of one isomer increased when NMP was used (compound lb). Finally, the 4-methylphthalic anhydride amic acid (If) displayed a single signal in the F-... 

G = sp gr of sample (as detd in test 2) 5) Ash. Weigh a lOg sample in an accurately fared porcelain crucihle and evaporate nearly to dryness over a low flame or on a hot plate. Ignite the residue at a red heat, cool in a desiccator and weigh. Repeat the Ignition to constant weight. The increase in wt in the crucible times 10 gives % ash Note The use of the term "Methylphthalate instead of "Dime thy lphthalate" (as it is done by some investigators) should be avoided because there is a true monomethyl compd. such as described in Beil 9, 797 Refs 1) Beil 9, 797, (350) [584]... 

Pseudocumene 200 Trimellitic acid, 23 Methylphthalic acid, 39 Dimethylbenzoic acid, 14... 

The diene 1 reacts exothermically with dimethyl acetylenedicarboxylate in benzene at room temperature to give dimethyl 4-AyV-dimethylamino-5-methylphthalate in 70% yield. 

Phthalates Dimethyl phthalate, diethyl phthalate, diisobutyl phthalate, dibutyl phthalate, dicyclohexyl phthalate, bis(2-ethylhexyl) phthalate, (2-ethylhexyl) methylphthalate... 

C9H6BrF02 5-bromo-2-fluorocinnamic acid 102865-71- 25.00 1.6228 2 15940 C9H603 3-methylphthalic anhydride 4792-30-7 25.00 1.2778 2... 

C9H1203 hexahydro-4-methylphthalic anhydride 19438-60-9 500.92 43.973 2 17292 C9H13N 3-methylphenethyl amine 55755-17-4 479.94 41.960 2... 

C8H9N02 fchitin pyrolvsis product) 1 S methylphthalic anhydride 1 un... 

EINECS 243-073-6 1,3-lsobenzofurandione, 5-methyl- 4-Methylphthalic anhydride Phthalic anhydride, 4-methyl-. 

Fluorescent whitening agent (stilbene- 19438-61-0 4-Methylphthalic anhydride 2504... 

As matrix polymer, an epoxy polymer based on 3,4-epoxycyclohexyl-methyl-3,4-epoxycyclohexane carboxylate (epoxy monomer), cured by hexahydro-4-methylphthalic anhydride at a molar ratio of 0.87-1.0 was used. To this mixture a nanofiller, MMT (Cloisite 30B) was added. Before this the nanofiller was mixed with denatured ethanol for removal of any excess of surfactants from the silicate platelets surface. This mixture was then centrifuged at 5,000 rpm for 10 min prior to the decanting of the ethanol. After Cloisite SOB addition the mixture was stirred in a mixer at... 

The hardener portion (Part B) may also be mixed with fillers, diluents, solvents, and other additives. Fillers may be mixed in the resin portion alone or partly in the resin and partly in the hardener portion. Adhesion promoters such as Dow Corning A-180 silane may also be added to enhance the adhesion of the filler particles to the resin or hardener. Examples include several electrically conductive epoxy formulations that were used to evaluate their electrical stability on non-noble metal surfaces. The base epoxy resin was the diglycidylether of bisphenol-F (DGEBF, equivalent wt. = 170 g). Methylhexahydrophthalic anhydride, hexahydrophthalic anhydride, and 4-methylphthalic anhydride were evaluated as curing agents with 4-methylimidazole as a catalyst. The manufacturing procedure was ... 

---