Docosane

Recently, two new facets have been added to scarab chemistry. A suite of unusual A9 10-allenic hydrocarbons like 86 has been identified among the cutic-ular hydrocarbons from several Australian melolonthine scarab beetles [184]. Though very low-level components in the related cane beetle Antitrogus parvu-luSy the major cuticular hydrocarbons in this species proved to be oligomethyl-docosanes like 87. Only the relative configurations of these compounds could be determined [185]. Whether these interesting hydrocarbons have a function as pheromones needs to be established. 

Docosan-l-ol Hexadecanoic acid Dodecan-5-olide 2-Heptylpyridine... 

Dobson spectrophotometer spect A photoelectric spectrophotometer used in the determination of the ozone content of the atmosphere compares the solar energy at two wavelengths in the absorption band of ozone by permitting the radiation of each to fall alternately upon a photocell. dab-san Spek-tro-fa tam-ad-ar docosane org chem C22H46 A paraffin hydrocarbon, especially the normal isomer CH3(Cf2l2)2oCH3. dak-a,san ... 

Docosan-l-ol Lf ° Dodeca-trans-6-trans-9-dienoic acid, 3-psi-hydrohy-4-psi-9-dimethyl Cured Lf ... 

Figure 14.4. Less common examples of ternary equilibria and some temperature effects, (a) The system 2,2,4-tri-methylpentane + nitroethane + perfluorobutylamine at 25°C the Roman numerals designate the number of phases in that region [Vreeland and Dunlap, J. Phys. Chem. 61, 329 (1957)]. (b) Same as (a) but at 51.3°C. (c) Glycol + dodecanol + nitroethane at 24°C 12 different regions exist at 14°C [Francis, J. Phys. Chem. 60, 20 (1956)]. (d) Docosane + furfural + diphenylhexane at several temperatures [Varteressian and Fenske, Ind. Eng. Chem. 29, 270 (1937)]. (e) Formic acid + benzene + tribromomethane at 70°C the pair formic acid/benzene is partially miscible with 15 and 90% of the former at equilibrium at 25°C, 43 and 80% at 70°C, but completely miscible at some higher temperature, (f) Methylcyclohexane + water + -picoline at 20°C, exhibiting positive and negative tieline slopes the horizontal tieline is called solutropic (Landolt-Bornstein II2b).

The range of soluble polythiophenes has been growing rapidly to include side chains up to docosane 267), ether and amide links in the side chains 268), and water-soluble polymers with sulfonated side chains (Table 1) which are claimed to be self-doping in that the sulphonate may act as the counterion to the delocalized chain cation 269,270). In principle, these polymers can be p-doped and undoped by the transport of a proton or a small cation rather than a large anion, and so may respond more rapidly. By treatment of an aqueous solution with NOPF6, a doped solution can be made, which slowly degrades. 

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