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Tobias acid

Llthol Reds. Lithol Red or Pigment Red 49 1/7103-38-4] is one of the most important of the precipitated salt pigments. They comprise a family of sodium (PR 49), barium (PR 49 1), calcium (PR 49 2), and strontium (PR 49 3) salts of dia2oti2ed Tobias acid or 2-naphthylamine-l-sulfonic acid coupled with 2-naphthol. The most popular are the barium and calcium salts, the former being yellower in shade. These reds are used where brightness, bleed resistance, and low cost ate of primary importance. They are neither resistant to heat nor chemicals, and are used primarily in printing inks and some inexpensive air-dried industrial paints where good durabiUty is not requited. [Pg.28]

Amination of phenoHc derivatives is limited to specially developed catalytic processes for aniline and y -toluidine (3). More general conditions apply to amination of naphthols by the Bucherer reaction. Important intermediates made by a Bucherer reaction include Tobias acid and gamma acid. [Pg.292]

Naphthylamine-5,7-disulphonic acid and 2-naphthylamine-l-sulphonic acid, which are intermediate products in Scheme 4.28, as well as 2-naphthylamine-l,5-disulphonic acid (obtained by careful low-temperature sulphonation of Tobias acid), are all used in the synthesis of azo dyes. [Pg.202]

Notes. (1) Tobias acid, available from Fluka AG Chemische Fabrik see Section 6.5.4, p. 900. [Pg.936]

Lithol Reds (Barium Lithol PR 49 1, Cl No. 15630 1 Calcium Lithol PR 49 2, Cl No. 15630 2). Discovered in 1899, this pigment s major use is in the printing ink industry and finds only limited application within the plastics marketplace. Chemically the pigment is the reaction product from the coupling of 2-naphthol to diazotized 2-naphthylamine-l -sulfonic acid (Tobias acid). The respective metal salts... [Pg.103]

Naphthylamine-l-aulfonic Acid (Tobias Acid) from /3-Naphthol... [Pg.114]

R R acid (2R acid) Schaeffer s acid Schoelkopf s acid sultam acid Tobias acid... [Pg.115]

Bucherer reaction. A procedure for preparation of (i-naphthylamineby heating (i-naphthol with a water solution of ammonium sulfite. A sulfite solution is prepared by saturating concentrated ammonia solution with sulfur dioxide and adding an equal volume of concentrated ammonia solution, (i-naphthol is added and the charge is heated in an autoclave provided with a stirrer or a shaking mechanism. (L. F. Fieser). This reaction is also involved in the preparation of several azo dye intermediates, e.g., Tobias acid. [Pg.188]

Lithol Red [BASF]. TM for one of a group of pigments made by combining Tobias acid and (i-naphthol. [Pg.767]

Beilstein Handbook Reference) BRN 0613084 EINECS 201-331-5 HSDB 5239 Kyselina 2-naftylamin-1-sulfonova Kyselina tobiasova NSC 5523 Tobias acid. Used as an azo dye intermediate and as an optical brightener. Crystalline solid Xm = 225, 244, 283, 313, 318 nm (s 40900, 18600, 5900, 714, 669 MeOH) slightly soluble in H2O, EtOH, Et20. DuPont. [Pg.621]

See other pages where Tobias acid is mentioned: [Pg.715]    [Pg.1000]    [Pg.1000]    [Pg.1000]    [Pg.495]    [Pg.495]    [Pg.501]    [Pg.174]    [Pg.291]    [Pg.64]    [Pg.64]    [Pg.202]    [Pg.331]    [Pg.715]    [Pg.1050]    [Pg.1051]    [Pg.17]    [Pg.174]    [Pg.546]    [Pg.585]    [Pg.17]    [Pg.732]    [Pg.733]    [Pg.1081]    [Pg.1093]    [Pg.1249]    [Pg.17]    [Pg.1013]    [Pg.621]    [Pg.689]   
See also in sourсe #XX -- [ Pg.3 ]

See also in sourсe #XX -- [ Pg.622 ]

See also in sourсe #XX -- [ Pg.320 ]



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