O-Terphenyl

Since the thermal dehydrocondensation proceeds by a free-radical mechanism (37), various radical-forrning promoters like acetone, ethanol, or methanol have been found useful in improving conversion of ben2ene to condensed polyphenyls. In the commercial dehydrocondensation process, ben2ene and some biphenyl are separated by distillation and recycled back to the dehydrocondensation step. Pure biphenyl is then collected leaving a polyphenyl residue consisting of approximately 4% o-terphenyl, 44% y -terphenyl, 25% -terphenyl, 1.5% triphenylene, and 22—27% higher polyphenyl and tars. Distillation of this residue at reduced pressure affords the mixed terphenyl isomers accompanied by a portion of the quaterphenyls present. [Pg.117]

The contaminant in the product of m.p. 186-194° is present in low concentration and is very probably o-terphenyl. It is characterized by an absorption near 695 cm. in the infrared which is absent in the spectrum of pure triphenylene. [Pg.107]

Polyvinylacetate Polymethylmethacrylate Propylene carbonate o-Terphenyl Phenyl salicylate... [Pg.667]

Hexafluorpropen 1950 Toluol (Cphen—CMeth) 1953 2,2 - und 4,4 -Difluordiphenyl 1954 o-Terphenyl 1944 1,3,5-Tnphenylbenzol 1952... [Pg.27]

Figure 5.12 Polyaromatic hydrocarbon species (1) phenanthrene, (2) anthracene, (3) pyrene, (4) benz[o]anthracene, (5) chrysene, (6) naphthacene, (7) benzo[c]phenanthrene, (8) benzo[ghi] fluoranthene, (9) dibenzo[c,g]phenanthrene, (10) benzo[g/ ]perylene, (11) triphenylene, (12) o-terphenyl, (13) m-terphenyl, (14) p-terphenyl, (15) benzo[o]pyrene, (16) tetrabenzonaphthalene, (17) phenanthro[3,4-c]phenanthrene, (18) coronene...

Common Name o-Terphenyl Synonym 1,2-diphenyl benzene Chemical Name ... [Pg.780]

The formation of o-terphenyl is of special interest, and by isotopic labeling it was shown that this compound is formed by consecutive phenyl and hydrogen migrations. The key intermediate in this sequence of rearrangements is the formation of a highly strained isobenzene (Scheme 20). Several alternative mechanisms are not compatible with the observed distribution of isotopes and could thus be ruled out.106... [Pg.195]

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)... [Pg.41]

Another informative test mixture is that described by Tanaka [43], in which selectivity between triphenylene (TRI) and o-terphenyl (o-TER) is used to characterize the shape recognition capability of LC stationary phases. The primary difference between these two solutes is their planarity TRI is a planar PAH and o-TER possesses... [Pg.240]

Fujimoto et al. [77] synthesized a novel phase by coupling a dodecylamino-substituted P-cyclodextrin (P-CD) to 3-glycidoxypropyl-derivatized silica gel. The surface coverage of this phase was reported as 0.37 xmol/m, which amounts to a surface coverage of 2.6 xmol/m for C12 chains (seven chains per fi-CD). An increase in shape selectivity was observed when compared with a conventional Cis monomeric phase as determined by selectivity differences between j9/m-terphenyl, j9/o-terphenyl, and coronene/phenanthro[3,4-c]phenanthrene solute pairs and was attributed to the localized high ligand density as constrained by the fi-CD platform structure. [Pg.249]

For the monomeric stationary phase. Figure 9.19 shows the SRM 869a ofTBN/BaP decreasing with increasing proportions of aceonitrile in the mobile phase, which should indicate increased shape selectivity with added acetonitrile. This is the same observed trend when organic solvents are added to water in a reversed-phase separation. However, the selectivity measured from the triphenylene/o-terphenyl pair and the chrysene/benzo[fl]anthracene pair showed exactly opposite trends in that the planarity and LIB selectivity was increased with decreasing proportions of acetonitrile. [Pg.443]

FIGURE 9.19 Effect of mobile phase composition on shape selectivity with a monomeric octadecylpolysiloxane stationary phase, column using (a) SRM 869a (b) triphenylene/o—terphenyl (c) chrysene/benzo[a]anthracene with column outlet pressure 20.0 MPa and flow rate 1 mL/min at pump head. (Reprinted from J. W. Coym, J. G. Dorsey, J. Chromatogr. A, 971 61 (2002). With permission.)... [Pg.444]

Pyrolysis of phthalic anhydride in the presence of polyvinyl chloride at 600 °C for 10 min gave the following compounds biphenyl, fluorene, benzophenone, 9-fluorenone, o-terphenyl, 9-phen-ylfluorene, and three unidentified compounds (Bove and Dalven, 1984). [Pg.963]

Parathion, Phorate Sulfur oxides, see Malathion Tartaric acid monoamide p-TCCH, see Lindane y-TCCH, see Lindane TCDD, see 2,4,5-Trichlorophenol Terbufos sulfone, see Terbufos Terbufos sulfoxide, see Terbufos Terephthalic acid, see p-Xylene o-Terphenyl, see Phthalic anhydride 2,2, 4,4 -Tetraamino-6,6 -azotoluene, see 2,4,6-Trinitrotoluene... [Pg.1540]

See also in sourсe #XX -- [ Pg.392 ]

See also in sourсe #XX -- [ Pg.195 ]

See also in sourсe #XX -- [ Pg.656 ]

See also in sourсe #XX -- [ Pg.780 ]

See also in sourсe #XX -- [ Pg.67 , Pg.321 , Pg.384 , Pg.385 ]

See also in sourсe #XX -- [ Pg.22 , Pg.88 , Pg.89 , Pg.90 , Pg.116 , Pg.117 , Pg.129 , Pg.131 , Pg.383 , Pg.384 ]

See also in sourсe #XX -- [ Pg.22 , Pg.88 , Pg.89 , Pg.90 , Pg.116 , Pg.117 , Pg.129 , Pg.131 , Pg.383 , Pg.384 ]

See also in sourсe #XX -- [ Pg.89 , Pg.356 ]

See also in sourсe #XX -- [ Pg.189 , Pg.191 , Pg.192 ]

See also in sourсe #XX -- [ Pg.180 ]

See also in sourсe #XX -- [ Pg.215 ]

See also in sourсe #XX -- [ Pg.57 ]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...