Orcin

A 15 mg FeCls or 25 mg FeCl3-6H20 in 100 ml cone. HCl B too mg orcin (5-methyl-resorcin) freshly dissolved in 20 ml of Soln. A... 

Staining solution (Bial s reagent), prepared freshly 50 mg orcine monohydrate is dissolved in 12.5 ml distilled water, 20 ml HC1 37%, and 0.5 ml 1% ferric chloride... 

Trinitro-3.5-dioxy-l-methyl-benzol or so Trinitro-orcin in Ger),... 

SYNS l,3-DIHYDROXY-5-METHYLBENZENE 3,5-DIHYDROXYTOLUENE 5-METHYL-l,3-BENZENDI-OL 5-METHYLRESORCINOL ORCINOL ORCIN ORCINOL... 

Sb sulfide, Ba(NOj)i or CaSi, by McNutt (Ref 56) LA with KClOj/S/Pb thiocyanate 40/ 10/50% by duPont (Ref 58) LA/natural, synth or rubber substitute by Snelling (Ref 63) LA/ 6a(N03)2/tetracene by Weale (Ref 62) LA/ diazoguanidine plcrate with or without tetryl by Imperial Chem Inds (Ref 67) LA/nitro-soguanidine by Olsen Seavey (Ref 61) LA/ nitratohypophosphite by Brun Burns (Ref 68) LA/ground glass by Hatch (Ref 70) LA/ various expl additives which lower flash pointy by Dynamit-AG (Ref 72) LA/Pb nitro sores-orcinate by Kerone Carroll (Ref 71) LA/... 

The dyestuff from phenol has the composition, CjgHjsNOa. It forms a brown powder, insoluble in water, soluble in alkalies with a blue colour. The thymol dyestuff has the formula G30H36N2O4, and the orcin dyestuff CjxHxgNgOg. Both have a violet colour. 

This compound is formed by action of nitrous acid on an ethereal orcin solution, and is identical with the dyestuff obtained by Liebermann by action of nitrous acid on orcin in presence of sulphuric acid. 

These lichens contain a number of peculiar acids (lecanoric acid erythric acid, roccellic acid, c.), which are split up by alkalies, the final products being orcin, CeH3CH3(OH)2, and erythrite, C4H10O,. 

Orcin is the only compound important for the production of lichen colours with air and ammonia it yields orcein, C7H7NO3 , which is the principal dyestuff contained in archil [60, 61, 62, 63]. 

If the lichens used for the manufacture of archil are submitted to a longer treatment with ammonia, potash and lime being also added, the orcin is converted to litmus—a dyestuff which is red in the free state, and yields blue salts. A similar product may be... 

It was found that the formation of orcein from orcin is much more rapid in presence of hydrogen peroxide other oxidising agents did not give favourable results. 

No compound of the orcein class can be obtained from resorcin by action of hydrogen peroxide and ammonia. From a mixture of resorcin and orcin a mixed orcein, Eeso-orcein," CjoHsoNjO, is formed. 

The following year he attended the new University of Strasbourg with his cousin Otto Fischer and became influenced by Adolf von Baeyer. Studying under von Baeyer, Fischer received his Ph.D. in 1874 for his work on fluoresceine and orcin-phthalein. In the same year he was appointed assistant instructor at Strasbourg University and discovered the first hydrazine base, phenylhydrazine, and demonstrated its relationship to hydrazobenzene and to a sulfonic acid described by Strecker and Romer. 

A general synthetic procedure to alkaloids of this type, as well as to furanoquinoline structures, has been announced (M. Ramesh, P.S. Mohan and P. Shanmugan, Tetrahedron, 1984, 40, 4041 see also p.3431 ). The versatility of this approach is illustrated by syntheses of atanine, flindersine, orcine, preskimmianine, 0-methylglycosolone and zanthobungeanine. 

The formation of orcin 7 in addition to 6 is the result of a subsequent deprotonation of 6 to the enolate 8 which recyclizes by an intramolecular aldol condensation. This reaction gave rise to the hypothesis of the biosynthesis of aromatic compounds from polyketides (Collie 1907) [34]. 

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