Anils

U.S. production 1978 275000 tonnes, anils, A-phenylimides See Schiffs bases. 

The generic term azulene was first applied to the blue oils obtained by distillation, oxidation, or acid-treatment of many essential oils. These blue colours are usually due to the presence of either guaiazulene or velivazulene. The parent hydrocarbon is synthesized by dehydrogenation of a cyclopentanocycloheptanol or the condensation of cyclopentadiene with glutacondialdehyde anil. 

Perform the followmg experiment with succinic anhydride. This illustrates the formation of an anilic acid, which is usually an excellent... 

If the anhydride of an unknown acid is being used and the anilic acid does not crystallise after the mixture has been boiled for a short time, cool the solution, wash it with dilute hydrochloric acid to remove the excess of aniline, and evaporate the solvent the anilic acid will then usually crystallise. 

Benzal derivatives. Primary aromatic amines generally condense directly with benzaldehyde to form benzal derivatives (Schiff s bases or anils) ... 

The aniline then reacts with the ap-unsaturated aldehyde by 1 4-addition the addition product, under the influence of strong acid, cyclises to form 1 2-dihydroquinaldine. The latter is dehydrogenated by the condensation products of aniline with acetaldehyde and with crotonaldehyde simultaneously produced ( .c., ethylideneaniline and crotonylideneaniline) these anils act as hydrogen acceptors and are thereby converted into ethylaniline and n-butyl-aniline respectively. 

The anil of the addition product may be the intermediate just prior to cyoliaation which then takes place with the elimination of aniline. 

Aniline was first isolated in 1826 as a degradation prod uct of indigo a dark blue dye obtained from the West Indian plant Indigofera anil from which the name aniline IS derived... 

Stanley A. Gembicki Anil R. Oroskar James A. Johnson UOP... 

Phenylstilben-4-yl)benzoxazoles are prepared by means of the anil synthesis from 2-(4-methylphenyl)benzoxazoles and 4-biphenylcarboxaldehyde anil, and used for brightening polyester fibers (24,25). An example is (3) [16143-18-3]. 

The amino group is readily dia2oti2ed in aqueous solution, and this reaction forms a basis for the assay of sulfas. Aldehydes also react to form anils, and the yellow product formed with 4-(dimethylamino)hen2a1dehyde can be used for detection in thiu-layer and paper chromatography. Chromatographic retention values have been deterrnined in a number of thiu layer systems, and have been used as an expression of the lipophilic character of sulfonamides (23). These values have corresponded well with Hansch lipophilic parameters determined in an isobutyl alcohol—water system. 

Photochromism Based on Tautomerism. Several substituted anils of saHcylaldehydes are photochromic but only in the crystalline state. The photochromic mechanism involves a proton transfer and geometric isomerization (21). An example of a photochromic anil is /V-sa1icylidene-2-ch1oToani1ine [3172-42-7] C H qCINO. 

The only example of this type which is noteworthy is the in situ cyclization to (156) of the intermediate (155) from a 5-aminopyrimidine anil and DMF dimethyl acetal (80S479). 

In a related reaction the amino alcohol (413) was cyclized with HBr to the 3-methyl-1,2,3,4-tetrahydro derivative (414) <65JCS1558), whilst the Isay reaction itself has been shown (Section 2.15.15.6.1) to probably occur, at least in some cases, via a [6 + 0( )] cyclization of intermediate anils. 

Most fused benzene rings are stable toward nucleophilic attack, but exceptions are known for highly electron-deficient benzazoles. Thus aniline and benzofuroxan at 150°C give the anil (354) <45HCA850). 

X-ray crystal structure, 6, 516 Benzophenanthridines synthesis from anils, 2, 416 Benzophenanthridines, tetrahydro-synthesis, 2, 469 Benzo[c]phenanthridines synthesis, 2, 414 from aryl isocyanides, 2, 411 from benzynes, 2, 432 Benzo[i]phenanthridines synthesis, 2, 414 Benzophenanthridinones... 

There is thus an obvious energy saving by employing sttitic control over the conventional anil more energv-consuming throttle control. 

Since the load variation on an HT distribution network will he only nominal, anil the network will also have enough resistance, it should be possible to compensate the. system up to 70% or so. to turther improve the regulation of the network, say up to 5% of/ , without jeopardizing the level of stability. The application engineer can take a more judicious decision, knowing the condition of the network to be cotnpensated. 

Anil Kamra Ashwani Agrawal Dr Ashok Kumar B. Raman D.K. Duggtil M.R. Atter P.S. Gokhic S.R Shttrma Dr Subir Sen V.R. Sharmti... 

R.K. Gupta. NGEF Ltd, New Delhi J.R. Mahajan, Voltas Ltd. Mumbai Anil Kamra. Crompton Greaves Ltd, New Delhi B. Raman, BHEL, Bhopal S.K. Sharma, GE Motors India Ltd. Faridabad Anirudh Singh, BHEL, New Delhi... 

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