Diphenylene oxide

Synonyms AI3-00039 AIDS-18166 (l,r-Biphenyl)-2,2 -diyl oxide Biphenylene oxide 2,2 -Biphenylene oxide CCRIS 1436 CPD-926 Dibenzo[Ac/ furan Dibenzol[Ac/ furan Diphenylene oxide EINECS 205-071-3 NSC 1245. 

DIPT, see Isopropyl ether Dipentyl, see Decane Diphenyl, see Biphenyl 1,1 -Diphenyl, see Biphenyl 4,4 -Diphenylenediamine, see Benzidine p,p -Diphenylenediamine, see Benzidine Diphenylenemethane, see Fluorene o-Diphenylenemethane, see Fluorene Diphenylene oxide, see Dibenzofuran Diphenyl ether, see Phenyl ether s/m-Diphenylhydrazine, see 1,2-Diphenylhydrazine lV,A/ -Diphenylhydrazine, see 1,2-Diphenylhydrazine Diphenylnitrosamine, see IV-Nitrosodiphenylamine Diphenyl-lV-nitrosamine, see IV-Nitrosodiphenylamine A,lV-Diphenylnitrosamine, see IV-Nitrosodiphenylamine A,Al-Diphenyl-lV-nitrosamine, see IV-Nitrosodiphenylamine Diphenyl oxide, see Phenyl ether Diphenyltrichloroethane, see p,p -DDT Diphosphoric acid, tetraethyl ester, see Tetraethyl pyrophosphate... 

This review is concerned with the chemistry of dibenzofuran and its derivatives. Dibenzofuran is numbered as in (1) but the system shown in (2) is widespread in the older literature as is the synonym diphenylene oxide. The last comprehensive review on this topic was by Parham and appeared in 1951. The present work covers the period up to Volume 96 of Chemical Abstracts, although the parts of Volume 97 received at the time of writing have been scanned. Reference to literature earlier than 1951 is made only where deemed appropriate. 

Benzo[6 ]furan (2), usually called simply benzofuran, was first prepared by Perkin, who obtained it from coumarin as in Scheme 2 and (not understanding its constitution) called it coumarone, an unsuitable name that still survives in the term coumarone resin , for the compound is now valued for copolymerization purposes. Later the compound was isolated by distillation of bituminous coal, which is also a source of several methyl and hydroxy derivatives and of dibenzofuran (the name diphenylene oxide is now discarded) <75AHC(18)337>. 

Chemically, creosote is a mixture of a great number of compounds, almost exclusively of cyclic structure. Individual compounds present in creosote in concentrations of 2-4% are acenaphthene, fluorene, diphenylene oxide, anthracene, and carbazole. Only one compound, phenanthrene, is present in a larger concentration (12-14%). For many years, chemists in many countries have tried tu isolate individual compounds and to find profitable uses for them. Most of these attempts have failed with exception of those involving anthracene. See also Anthracene. The principal use of creosote is for preservation of wood. Railroad lies, poles, fence posts, marine pilings, and lumber for outdoor use are impregnated with creosote in large cylindrical vessels. If properly treated, the life of the wood is greatly extended. Materials that are competitive with creosote for wood-preservation purposes include various petroleum oils, and pentachlorophenol. Pentachlorophenol is used in solutions of creosote or of petroleum oils. Blends of creosote with petroleum oils also are used for economic reasons. 

An inert gas is bubbled through the sample. The volatile hydrocarbons are transferred into the vapor phase and trapped over a sorbent bed containing 2,6-diphenylene oxide polymer (Tenax GC). A methyl silicone (3% OV-1 on Chromosorb-W, 60/80 mesh) packing protects the trapping material from contamination. Other adsorbents such as Carbopack B and Carbosieve S III may also be used. If pentane and other low boiling hydrocarbons need to be detected, the sorbent trap should be filled with activated charcoal, silica gel, and Tenax, respectively, in equal amounts. 

Tar Fluorene Diphenylene oxide Acenaphthene Methyl-naphthalenes... 

Use a trap not shorter than or narrower than 25 cm x 2.67 mm (id). Pack the trap to contain the indicated minimum lengths of adsorbents in the following order, beginning at the trap inlet 7.7 cm of 2,6-diphenylene oxide polymer (TENAX GC, or equivalent), 7.7 cm of silica gel, and 7.7 cm of coconut charcoal. 

A stream of nitrogen gas was passed through freshly collected mother s milk and the effluent collected by adsorption on a Tenax TA resin (2,6-diphenylene oxide based). Subsequent desorption into a GC-MS instrument led to the identification of 21 volatile components (low-molecular-weight aldehydes, ketones, alcohols, and lactone) in the milk headspace. When each was screened for behavioral activity, one, 2-methylbut-2-enal (34), was clearly the main compound responsible for eliciting searching—grasping responses in the rabbit pup test subjects. 

McCombie H, MacMillan WG, Scarborough HA (1931), J. Chem. Soc. Trans. / 529-535. Some substitution products of 2-nitro- and 2-acetamido-diphenyl ethers and the corresponding diphenylene oxides"... 

The utility of the DSC for studying polymer-polymer miscibility has been demonstrated for poly(vinyl chloride)/nitrile rubber polyfvinyl methyl ether)/poly-styrene and poly(2,6-dimethyl 1,4-diphenylene oxide)/poly(styrene-co-chloro-styrene)It has also been particularly useful for measuring the melting point depressions of crystalline polymers in blends Mn order to calculate the interaction parameter as will be discussed later. 

Dibenzo(uran,Diphenylene Oxide or Bipheny-lene Oxide (CA 3th Decennial Subject Index, p 4106s) (called Diphenylenoxyd or Dibenzo-furan in Ger),... 

Another group of polymers with good heat resistance includes certain aryl-alicyclic compounds. They are generated from the polycondensation of 4,4 -diaminodiphenyl oxide with various anhydrides such as tricyclo[4,2,2,0 ]dec-9-ene-3,4,7,8-tetracarboxylic acid anhydride, 9-oxatricyclo[4.2,2,0 ]nonane-3.4,7,8-tetracarboxylic acid anhydride, cyclobutene-1,2,3,4-tetracarboxylic acid anhydride, and bicyclo[2,2,2]octane-23,5,6-tetracarboxylic acid anhydride. Thermal stability of these polymers is affected by the ring stability (strain) regardless the true chemical structure. Pyrolysis at 650° C generates some compounds that are the same in nature and some others that are characteristic for each polymer. The main decomposition paths, as indicated by the main pyrolysis products are shown below for each polymer (Ar = 4,4 -diphenylene oxide) ... 

Synonyms 2,2 -Biphenylene oxide 2,2 -bipheny-lylene oxide dibenzo(B,D)furan diphenylene oxide... 

Diphenylene Oxide 132-64-9 Ethyl Chloroformate 541-41-3 Ferrous Sulfate 7720-78-7... 

Diphenylene Oxide 13473-90-0 Aluminum Nitrate 141-79-7 Mesityl Oxide... 

Synonym Diphenylene oxide Source Van Alsten, J. G. Eckert, C. A. J. Chem. ... 

Phenanthroline Phenazine Dibenzofuran Diphenylene oxide Dibenzothiophene Diphenylene sulhde 9-Thiafluorene 2-Chlorobiphenyl 4-Chlorobiphenyl 9-Azafluorene Carbazole Dibenzopyrrole Acenaphthene Biphenyl... 

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