Ortho-dichlorobenzene

Calculate the line size and specify the pump required for the line shown in Figure 5.15 material ortho-dichlorobenzene (ODCB), flow-rate 10,000 kg/h, temperature 20°C, pipe material carbon steel. 

Figure 25 H NMR spectrum of the film sample dissolved in 1 part trichlorobenzene and 2 parts ortho-dichlorobenzene. 

EPA. 1987p. U.S. Environmental Protection Agency. Final draft criteria document for ortho-dichlorobenzene, meta-dichlorobenzene, para-dichlorobenzene. Criteria and Standards Division. Office of Drinking Water. EPA, Washington, DC. 

Zapata-Gayon C, et al Clastogenic chromosomal aberrations in 26 individuals accidentally exposed to ortho dichlorobenzene vapors in the National Medical Center in Mexico City. Arch Environ Health 37 231-235, 1982... 

Monochlorobenzene is a flammable clear liquid (fp, -45"C bp, 132°C) used as a solvent, solvent carrier for methylene diisocyanate, pesticide, heat transfer fluid, and in the manufacture of aniline, nitrobenzene, and phenol. The 1,2- isomer of dichlorobenzene (ortho-dichlorobenzene) has been used as a solvent for degreasing hides and wool and as a raw material for dye manufacture. The 1,4- isomer (para-dichlorobenzene) is also used in dye manufacture and as a moth repellant and germicide. All three isomers have been used as fumigants and insecticides. The 1,2- and 1,3-(meta) isomers are liquids under ambient conditions, whereas the 1,4- isomer is a white sublimable solid. Used as a solvent, lubricant, dielectric fluid, chemical intermediate, and formerly as a termiticide, 1,2,4-trichlorobenzene is a liquid (fp, 17°C bp, 213°C). 

The arylation of cyclopentadiene (3) with 2-chlorobromobenzene using tris(7ert-butyl)phosphine as ligand leads to a mixture of the tetra-arylated product 5e and its pentaarylated congener, both isolated in 17-18 % yield. With the less reactive ortho-dichlorobenzene the process stops at the stage of the triarylated species 4e, which can then be further arylated with 2-chlorobromobenzene. 

Polymerization experiments carried out using Pd(dpm)2 also showed that norbornene was polymerized quite effectively in the absence of AlEt3 at a 4000 1 9 monomer Pd B(C6F5)3 ratio (run 6, Tab. 4.2). The polymer was soluble enough at 50°C in ortho-dichlorobenzene to obtain a H NMR spectrum. No olefinic resonances were observed, confirming the formation of addition poly(norbornene). However, the solubility difficulties encountered prevented further characterization. 

Scheme 3 Synthetic scheme of the two possible pathways towards PvTPA-/ -PPerAcr block copolymers via NMRP. Using PvTPA as a macroinitiator for the NMRP of PerAcr gave monomodal block copolymers whereas starting from PPerAcr as macroinitiator, a mixture of PPerAcr and the corresponding PPerAcr-/ -PvTPA block copolymer was obtained. o-DCB ortho-dichlorobenzene, TIPNO 2,2,5-trimethyl-4-phenyl-3-azahexane-3-oxyl...

SYNONYMS 1,2-dichlorobenzene, ortho-dichlorobenzene, ortho-dichlorobenzol. 

Ortho-dichlorobenzene converts more rapidly to trichlorobenzene than does para-dichlorobenzene. Thus the percentage of para in the di-chloro fraction increases further after the trichloro begins to form. 

Ortho-dichlorobenzene added to the charge increases the selectivity of the reaction to para-dichlorobenzene, probably as a result of mass action and increased polarity of the chlorinating mass. 

The mother liquor which is predominately ortho-dichlorobenzene is fractionated under vacuum, giving a first fraction high in para-dichloro benzene which is returned to the crystallizer system, a main fraction of high-purity ortho-dichlorobenzene, and a polychlorobenzene fraction which is used in trichlorobenzene production. 

Chlorinated Solvents. Ortho-dichlorobenzene or similar compounds are used in a modified form of the baking process for sulfonating aromatic amines, as discussed in a preceding section. They are high-boiling, relatively inert, inexpensive, and are immiscible with water, thereby facilitating removal of the latter from the reaction mixture by partial-pressure distillation. 

Solvent Stability. It is not always essential that a prospective solvent, well suited for a particular sulfonation reaction in one or more respects, be completely inert toward the pure sulfonating agent. Several of the solvents mentioned above, for example, ortho—dichlorobenzene, nitrobenzene, chloroform, carbon tetrachloride, methylene chloride, and trichloroethylene, will react with SO3 or its derivatives either by sulfonation or oxidation, in some cases quite easily. Reactive solvents can be employed with little loss if... 

C), yields a crude sulfonate of 90 per cent purity (3 per cent aniline), which is further purified by reprecipitation from the sodium salt. The baking step is sometimes facilitated by operating in vacuo. A modified version of this process, involving azeotropic removal of water with an inert solvent (ortho-dichlorobenzene), is often used. 

Synonyms/Trade Names o-DCB 1,2-Dichlorobenzene ortho-Dichlorobenzene o-Dichlorobenzol... 

This desymmetrisation strategy can be applied to access compounds possessing planar chirality. Suzuki reaction of ortho-dichlorobenzene chromium tricarbonyl complex with aryl and ethynylboronic adds using enantiomericaUy pure palladium complexes gives the chiral monosubstitution product with moderate ee as the major product with formation of small amounts of the disubstituted compound. The desymmetrisation of meso-ditriflates such as (10.34) is also possible by selective Suzuki coupling with arylboronic acids, giving chiral compounds with quaternary centres with high ee. 

Ortho-dichlorobenzene, CgH4Cl2, is obtained when two of the adjacent hydre en atoms in benzene are replaced with Cl atoms. A skeleton of the molecule is shown here, (a) Complete a Lewis structure for the molecule using bonds and electron pairs as needed, (b) Are there any resonance structures for the molecule If so, sketch them, (c) Are the resonance structures in (a) and (b) equivalent to one another as they are in benzene If not, explain what makes them different. 

---