Baeyer sentence example

baeyer
  • The original hypothesis of Baeyer suggested that the course of events is the following: the carbon dioxide is decomposed into carbon monoxide and oxygen, while water is simultaneously split up into hydrogen and oxygen; the hydrogen and the carbon monoxide unite to form formaldehyde and the oxygen is exhaled.
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  • Baeyer and V.
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  • Baeyer, Ber., 1880, 13, p. 2258), crystallizes in needles which decompose when heated to 155-156° C. It is readily converted into indigo.
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  • von Baeyer in 1875.
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  • Baeyer supposes that in the formation of carbon, rings " the valencies become deflected from their positions, and that the tension thus introduced may be deduced from a comparison of this angle with the angles at which the strained valencies would meet.
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  • von Baeyer in 1870, who obtained benzene on distilling the calcium salt with lime.
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  • von Baeyer's researches (commenced in 1886) on the reduced phthalic acids.
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  • Baeyer pointed out that although benzene derivatives were obtainable from hexamethylene compounds, yet it by no means follows that only hexamethylene compounds need result when benzene compounds are reduced.
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  • that 1.2 and 1.6 should be ortho-positions, 1.3 and 1.5 meta-, and 1.4 para-, and following out the transformation on the Ladenburg formula, then an ortho-dioxyterephthalic acid (IV) should result, a fact denied by experience, and inexplicable unless we assume a wandering of atoms. Kekule's formula (III), on the other hand, is in full agreement (Baeyer).
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  • To follow Baeyer's results we must explain his nomenclature of the reduced benzene derivatives.
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  • From these results Baeyer concluded that Claus' formula with three para-linkings cannot possibly be correct, for the Q2.5 dihydroterephthalic acid undoubtedly has two ethylene linkages, since it readily takes up two or four atoms of bromine, and is oxidized in warm aqueous solution by alkaline potassium permanganate.
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  • Trans., 1887, p. 258), and shortly afterwards by Baeyer (Ann., 1888, 245, p. 103).
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  • Claus maintained that Baeyer's view was identical with his own, for as in Baeyer's formula, the fourth valencies have a different function from the peripheral valencies, being united at the centre in a form of potential union.
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  • Further researches by Baeyer, and upon various nitrogenous ring systems by E.
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  • (7) (2) Phenanthrene is regarded by Armstrong as represented by (3), the lateral rings being benzenoid, and the medial ring fatty; Bamberger, however, regards it as (4), the molecule being (3) (4) entirely aromatic. An interesting observation by Baeyer, viz.
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  • Baeyer and supported by F.
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  • Mention may be made of the phenomenon of halochromism, the name given to the power of colourless or faintly-coloured substances of combining with acids to form highly-coloured substances without the necessary production of a chromophoric group. The researches of Adolf von Baeyer and Villiger, Kehrmann, Kauffmann and others, show that this property is possessed by very many and varied substances.
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  • c 6 6 4(000Na (I) (2) Baeyer (Ber., 1905, 38, p. 569) and Silberrad (Journ.
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  • Baeyer has suggested that the nine carbon atom system of xanthone may act as a chromophore.
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  • (3) If a colourless compound gives a coloured one on solution or by salt-formation, the production of colour may be explained as a particular form of ionization (Baeyer), or by a molecular rearrangement (Hantzsch).
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  • Baeyer, Ann., 1870, 155, p. 283).
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  • Johann Friedrich Wilhelm Adolf Von Baeyer >>
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  • Baeyer was enabled to carry out the complete synthesis of indigo.
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  • Baeyer (Ber., 1902, 35, p. 1201) regards them as oxonium salts containing tetravalent oxygen (C 2 H 5) 2 :0:(MgR) (X), whilst W.
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  • Baeyer and W.
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  • Baeyer).
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  • Baeyer's laboratory at Berlin, attacking among other problems that of the composition of camphor.
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  • In 1871, on Baeyer's recommendation, he was engaged by H.
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  • Baeyer, Ann., 1863, 127, p. 12), crystallizes in needles or prisms and possesses a very acid reaction.
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  • Baeyer, Ann.
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  • Baeyer and Villiger assume for the configuration of the salts of carbonyl compounds the arrangement > C: 0 < whilst, W.
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  • Baeyer in 1890, by heating alizarin with fuming sulphuric acid for 24-48 hours at 35-40° C., obtained a product, which after treatment with caustic soda gave a sulphuric acid ester of quinalizarin, and this after acidification and boiling was converted into quinalizarin (Alizarin Bordeaux) or 1.2.6.9 tetra-oxyanthraquinone.
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  • Baeyer, Ber., 18 74, 7, p. 1638).
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  • Baeyer in 1868.
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  • JOHANN FRIEDRICH WILHELM ADOLF VON BAEYER (1835-), German chemist, was born at Berlin on the 31st of October 1835, his father being Johann Jacob von Baeyer (1794-1885), chief of the Berlin Geodetical Institute from 1870.
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  • Baeyer, Ann., 1870, 155, pp. 281, 294; J.
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  • Baeyer and F.
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  • Baeyer): CH 2 - CH 2 CH= C Cl CH= CH T_T C?H 4 ?
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  • Baeyer's symbol A.
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  • Baeyer, ibid., 1870, 155, p. 266), benzene giving methylpentamethylene; by passing the vapour of benzene hydrocarbons over finely divided nickel at 180-250° C.
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  • Baeyer by removing the elements of hydriodic acid from iodocyclo-hexane on boiling it with quinoline.
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  • Baeyer obtained what was probably a mixture of the two by heating I.
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  • Baeyer, Ber., 1897, 30, p. 2075).
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  • Baeyer (Ber., 1895, 28, p. 648; 1896, 29, p. 10) the nitrosochlorides are not simple addition products, but bimolecular compounds or bisnitrosochlorides.
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  • Baeyer, Ann., 1864, 130, p. 143); by the hydrolysis of cyanacetic acid (H.
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  • Baeyer, Ber., 1880, 13, p. 2258), crystallizes in needles which decompose when heated to 155-156° C. It is readily converted into indigo.
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  • von Baeyer has sought to explain the variations in stability manifest in the various polymethylene rings by a purely mechanical hypothesis, the " strain " or Spannungs theory (Ber., 1885, p. 2277).
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  • from acetylene and acetone); but according to Baeyer (Ber., 1886, 9, 1797) it fails to explain the formation of dioxyterephthalic ester from succinosuccinic ester, unless we make the assumption that the transformation of these substances is attended by a migration of the substituent groups.
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  • Succinosuccinic ester behaves both as a ketone and as a phenol, thereby exhibiting desmotropy; assuming the ketone formula as indicating the constitution, then in Baeyer's equation we have a migration of a hydrogen atom, whereas to bring Ladenburg's formula into line, an oxygen atom must migrate.
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  • The relative merits of the formulae of Kekule, Claus and Dewar were next investigated by means of the reduction products of benzene, it being Baeyer's intention to detect whether double linkages were or were not present in the benzene complex.
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  • Another form of isomerism is occasioned by spatial arrangements, many of the reduced terephthalic acids existing in two stereo-isomeric forms. Baeyer explains this by analogy with fumaric and maleic acids: he assumes the reduced benzene ring to lie in a plane; when both carboxyl groups are on the same side of this plane, the acids, in general, resemble maleic acids, these forms he denotes by rcis-cis, or shortly cis-; when the carboxyl groups are on opposite sides, the acids correspond to fumaric acid, these forms are denoted by rcis-trans, or shortly trans-.
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  • Simultaneously with the discussions of Kekule, Ladenburg, Claus, Baeyer and others as to the merits of various plane formulae of the benzene complex, there were published many suggestions with regard to the arrangement of the atoms in space, all of which attempted to explain the number of isomers and the equivalence of the hydrogen atoms. The development of stereo-isomerism at the hands of ' Victor Meyer and G.
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  • Baeyer in 1890, by heating alizarin with fuming sulphuric acid for 24-48 hours at 35-40° C., obtained a product, which after treatment with caustic soda gave a sulphuric acid ester of quinalizarin, and this after acidification and boiling was converted into quinalizarin (Alizarin Bordeaux) or 1.2.6.9 tetra-oxyanthraquinone.
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  • Baeyer, ibid., 1870, 155, p. 266), benzene giving methylpentamethylene; by passing the vapour of benzene hydrocarbons over finely divided nickel at 180-250° C.
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