Ladenburg sentence example

ladenburg
  • Ladenburg (Ann., 1875, 179, p. 163) to be symmetrical trimethyl benzene; terephthalic acid, the remaining isomer, must therefore be the para-compound.
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  • Ladenburg (Ber., 2, p. 140) devised his prism formula (IV), the six carbon atoms being placed at the six corners of a right equilateral triangular prism, with its plane projections (V, VI).
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  • CH CH HC, N CH HC CH HC HC HC Hcch Hc Ch Ch Kekule t i Dewar Ladenburg One of the earliest and strongest objections urged against Kekule's formula was that it demanded two isomeric ortho-di-substitution derivatives; for if we number the carbon atoms in cyclical order from i to 6, then the derivatives 1.2 and 1.6 should be different.'
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  • Ladenburg submitted that if the 1 .
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  • Kekule answered Ladenburg by formulating a dynamic interpretation of valency.
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  • Ladenburg, who devoted much attention to the study of the substitution products of benzene, and 's to the support of his own formula.
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  • This implied that in the benzene complex there was at least one carbon atom linked to three others, thus rendering Kekule's formula impossible and Ladenburg's and Claus' possible.
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  • The formation of this substance readily follows from Kekule's formula, while considerable difficulties are met with when one attempts an explanation based on Ladenburg's representation.
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  • Strecker to be trichloracetoacrylic acid, was more favourably explained by his formula than by Ladenburg's.
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  • Other objections to Ladenburg's formula resulted from A.
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  • Ladenburg's prism admits of one mono-substitution derivative and three di-derivatives.
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  • By projecting Ladenburg's prism on a plane and numbering the atoms so as to correspond with Kekule's form, viz.
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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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  • This explanation has been challenged by Ladenburg (Ber., 1886, 19, 97; Ber., 1887, 20, p. 62) and by A.
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  • Ladenburg's prism formula would give two enantiomorphic ortho-di-substitution derivatives; while forms in which the hydrogen atoms are placed at the corners of a regular octahedron would yield enantiomorphic tri-substitution derivatives.
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  • Ladenburg, Entwickelungsgeschichte der Chemie (4th ed., 1907); A.
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  • Ladenburg, Handworterbuch der Chemie, A.
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  • Ladenburg and M.
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  • A few years later further work, with Albert Ladenburg, on the same element yielded silicochloroform and:led to a demonstration of the close analogy existing between the behaviour in combination of silicon and carbon.
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  • Ladenburg, Comptes rendus, 1867, 64, pp. 359, 1267); 4Si(0C2H5) 3 = SiH4+3Si(OC2H5)4.
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  • The organic derivatives of silicon resemble the corresponding carbon compounds except in so far that the silicon atom is not capable of combining with itself to form a complex chain in the same manner as the carbon atom, the limit at present being a chain of three silicon atoms. Many of the earlier-known silicon alkyl compounds were isolated by Friedel and Crafts and by Ladenburg, the method adopted consisting in the interaction of the zinc alkyl compounds with silicon halides or esters of silicic acids.
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  • Ladenburg, Ber., 1886, 19, p. 783); by heating the esters of nitric acid with alcoholic ammonia at 10o C. (0.
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  • Ladenburg, Ber., 1886, 19, p. 780).
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  • Ladenburg, Ber., 1883, 16, p. 1151).
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  • The result of the battle was a complete victory for the French, who followed up their success by driving a portion of Bournonville's army (on which the duke of Lorraine had rallied his forces) from the Neckar (action of Ladenburg near Heidelberg, July 7th).
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  • "ALBERT LADENBURG (1842-1911), German chemist, was born at Mannheim July 2 1842.
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  • Herz's Albert Ladenburg.
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  • acquired Worms in 1121 by the treaty of Wiirzburg, built a castle and granted privileges to the city, which retained its freedom until 1801, in spite of the bishops, who ruled a small territory south of the city, on both sides of the Rhine, and resided at Ladenburg near Mannheim till 1622.
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  • Ladenburg and J.
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  • Ladenburg, Ber.
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  • Ladenburg that the pyridinium alkyl iodides rearrange themselves when strongly heated and yield a and -y alkyl pyridines (Ber., 1883, 16, p. 1410 seq.; Ann., 1888, 247, p. I).
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  • Ladenburg) and by the action of alkalis on e-chloramylamine, Cl(CH2)5 NH2 (S.
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  • Ladenburg, Ann., (18 94, 2 79, P. 344).
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  • Ladenburg (see various papers in the Berichte for the years 1881, 1884, 1885, 1886, 1889, 1893, 1894, 1895, and Liebig's Annalen for 1888, 1894).
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  • rend., 1888, 106, p. 1357.) The gas may be liquefied by a pressure of about 17 atmospheres, the liquid so obtained boiling at - 61.8° C.; and by further cooling it yields a solid, the melting point of which is given by various observers as - 82° to - 86° C. (see Ladenburg, Ber., 1900, 33, p. 6 37).
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  • Of the earlier encyclopaedias we may notice the famous HandwOrterbuch der reinen and angewandten Chemie, edited by Liebig; Fremy's Encyclopedie de chimie, Wurtz's Dictionnaire de chimie pure et applique'e, Watts' Dictionary of Chemistry, and Ladenburg's HandwOrterbuch der Chemie.
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  • Ladenburg in 1874 (see Ber., 1874, 7, p. 1684; 1875, 8, p. 1666; Theorie der aromatischen Verbindungen, 1876).
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  • He admitted the possibility of the formulae of Kekule, Claus, Dewar and Ladenburg, although as to the last di-trimethylene derivatives should be possible reduction products, being formed by severing two of the prism edges; and he attempted to solve the problem by a systematic investigation of the reduced phthalic acids.
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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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  • 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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  • Ladenburg (1883, 1887) demonstrated that the molecule contained a reduced pyridine nucleus.
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