Hofmann, Ber., 188 2, 1 5, p. 977), by the partial hydrolysis of the nitriles, by the action of ammonia or ammonium carbonate on acid chlorides or anhydrides, or by heating the.
Hofmann, who obtained it by saturating an alcoholic solution of ammonium sulphide with sulphur and mixing the product with an alcoholic solution of strychnine, considered the resulting product to be H2S3; while P. Sabatier by fractionating the crude product in vacuo obtained an oi l which boiled between 60° and 85° C. and possessed the composition H4S5.
Hofmann), CS 2 +2NH 3 -->NH 2.
Von Hofmann, who materially helped the acceptance of the doctrine by the lucid exposition in his Introduction to Modern Chemistry, 1865.
Von Hofmann in 1867, and of that at Leipzig, designed by Kolbe in 1868.
Von Hofmann, who designed the laboratories and accepted the professorship in 1845 at the instigation of Prince Albert, and under his successor (in 1864) Sir Edward Frankland, this institution became one of the most important centres of chemical instruction.
Von Hofmann continued the investigation, and established their recognition as ammonia in which one or more hydrogen atoms had been replaced by hydrocarbon radicals, thus formulating the " ammonia type."
Hofmann and Schotensack decompose a mixture of phenol (3 molecules) and sodium carbonate (4 mols.) with carbonyl chloride at 140-zoo° C. When 90% of the phenol has distilled over, the residue is dissolved and hydrochloric acid added, any phenol remaining is blown over in a current of steam, and the salicylic acid finally precipitated by hydrochloric acid.
JOHANN CHRISTIAN KONRAD VON HOFMANN (1810-1877), Lutheran theologian and historian, was born on the 21st of December 1810 at Nuremberg, and studied theology and history at the university of Erlangen.
In 1842 he became professor ordinarius at Rostock, but in 1845 returned once more to Erlangen as the successor of Gottlieb Christoph Adolf von Harless (1806-1879), founder of the Zeitschrift fur Protestantismus and Kirche, of which Hofmann became one of the editors in 1846, J.
In theology, as in ecclesiastical polity, Hofmann was a Lutheran of an extreme type, although the strongly marked individuality of some of his opinions laid him open to repeated accusations of heterodoxy.
Hofmann, Ber., 1880, 13, p. 1224); by heating the acid anilides with sulphur or by the oxidation of thio-anilides.
Von Hofmann, whose assistant he became in 1851.
Hofmann, The Metallurgy of Lead (6th ed., New York, 1901); W.
Mitscherlich prepared it in 1834 by distilling benzoic acid with lime; and in 1845 Hofmann discovered it in coal-tar.
Von Hofmann, which is the Faraday lecture delivered before the London Chemical Society in March 1875, and is reprinted in Hofmann's Zur Erinnerung an vorangegangene Freunde; also W.
Hofmann is as follows: the mixture is distilled with caustic potash, when the primary, secondary and tertiary amines distil over, and the quaternary ammonium salt remains behind unaffected.
Hofmann), an alcoholic solution of stannous chloride (containing hydrochloric acid) (R.
This method was developed by Hofmann in 1868, who replaced the short tube of Gay-Lussac by an ordinary barometer tube, thus effecting the volatilization in a Torricellian vacuum.
The first of these is the recapitulation theory which Tyconius originated and Augustine adopted, and which has been revived in later times by Hofmann, Hengstenberg and others.
AUGUST WILHELM VON HOFMANN (1818-1892), German chemist, was born at Giessen on the 8th of April 1818.
When, in 1845, a school of practical chemistry was started in London, under the style of the Royal College of Chemistry, Hofmann, largely through the influence of the Prince Consort, was appointed its first director.
In leaving England, of which he used to speak as his adopted country, Hofmann was probably influenced by a combination of causes.
The college to which Hofmann devoted nearly twenty of the best years of his life was starved; the coaltar industry, which was really brought into existence by his work and that of his pupils under his direction at that college, and which with a little intelligent forethought might have been retained in England, was allowed to slip into the hands of Germany, where it is now worth millions of pounds annually; and Hofmann himself was compelled to return to his native land to find due appreciation as one of the foremost chemists of his time.
That city possesses a permanent memorial to his name in Hofmann House, the home of the German Chemical Society (of which he was the founder), which was formally opened in 1900, appropriately enough with an account of that great triumph of German chemical enterprise, the industrial manufacture of synthetical indigo.
Hofmann, in whose own research laboratory he was in the course of a year or two promoted to be an assistant.
Hofmann and J.
3, 1897; Hofmann, Zeitschrift fiir neutestamentliche Wissenschaft, iv.; for the newly-found Greek text see Acta apostolorum, ed.
Hofmann), for example C7H15CH2NH2-->C7H15CH2NBr2--C7H35CN.
Hofmann, Ann., 1868, 146, p. 107).
Hofmann in 1858 from aniline and carbon tetrachloride.
Hofmann having previously shown that oxidation of pure aniline alone or of pure toluidine yielded no fuchsine, whilst oxidation of a mixture of aniline and para-toluidine gave rise to the fine red dyestuff para-fuchsine (pararosaniline hydrochloride) CH 3 C 6 H 4 NH 2 +2C 6 H 5 NH 2 +30 = HOC(C 6 H 4 NH 2) 3 +2H20.
A memoir by Hofmann appeared in the Ber.
Hofmann, Ber., 1867, I, p. 27): [[Csnr+Nh 3 =Nh 2 Cs Nhr]]; [[Csnr+Nh2r=R Nh Cs Nhr]],.
Hofmann (Haarlem, 1883-1885); Erbkam, Gesch.
Von Hofmann at the School of Mines, he undertook the duty of making monthly reports to the registrargeneral on the character of the water supplied to London, and these he continued down to the end of his life.
For Melchior Hofmann (ca.
Von Hofmann in the Ber.
1-5), instead of giving his usual word of commendation, he plunges into a personal and historical vindication s of his apostolic independence, which, developed negatively and positively, forms the first of the three main 1 It is not quite clear whether traces of the Judaistic agitation were already found by Paul on this visit (so especially Holsten, Lipsius, Sieffert, Pfleiderer, Weiss and Weizsacker) or whether they are to be dated subsequent to his departure (so Philippi, Renan and Hofmann, among others).
Von Hofmann (2nd ed., 1872), Philippi (1884), R.
Later followed men like Hengstenberg, Homeyer, Bethmann-Hollweg, Puchta, Stahl and Heffter; Schelling, Trendelenburg, Bopp, the brothers Grimm, Zumpt, Carl Richter; later still, Twesten and Dorner, Gneist and Hinschius; Langenbeck, Bardeleben, Virchow, Du-Bois Reymond; von Ranke, Curtius, Lipsius, Hofmann the chemist, Kiepert the geographer; Helmholtz, van't Hoff, Koch, E.
Hofmann, Die Heiligen and Seligen des Bistums Wiirzburg (Wiirzburg, 1889); F.
Hofmann, Ber., 1883, 16, p. 590).
Hofmann, Ber., 1873, 6, p. 286).
Hofmann, Ber., 7 4, 430, 605), thus: 2 RI + 2 PH 4 I + ZnO = 2 R PH2 HI + ZnI 2 + H20, 2R1 + PH 4 I + ZnO = R 2 PH HI + ZnI 2 + H 2 O.
Hofmann, Ann., 1857, 104, p. 1).
Hofmann had shown that conine on distillation with zinc dust gave a-propyl pyridine (conyrine).
MELCHIOR HOFMANN (c. 1 49 8 - 1 543-4), anabaptist, was born at Hall, in Swabia, before 1500 (Zur Linden suggests 1498) .
By way of Livonia, Hofmann arrived at Dorpat in November 1524, but was driven thence in the following January.
At a colloquy of preachers in Flensburg (8th April 1529) Hofmann, John Campanus and others were put on their defence.
Hofmann maintained (against the "magic" of the Lutherans) that the function of the Eucharist, like that of preaching, is an appeal for spiritual union with Christ.
Hofmann and Claus Frey, an anabaptist, were detained in prison, a measure due to the terror excited by the Minster episode of 1533-1534.