Acid, pyrotartaric

Rea.ctlons, When free (R-R, R -tartaric acid (4) is heated above its melting point, amorphous anhydrides are formed which, on boiling with water, regenerate the acid. Further heating causes simultaneous formation of pymvic acid, CH COCOOH pyrotartaric acid, HOOCCH2CH(CH2)COOH and, finally, a black, charred residue. In the presence of a ferrous salt and hydrogen peroxide, dihydroxymaleic acid [526-84-1] (7) is formed. Nitrating the acid yields a dinitro ester which, on hydrolysis, is converted to dihydroxytartaric acid [617 8-1] (8), which upon further oxidation yields tartronic acid [80-69-3] (9). [Pg.525]

Pyro-traubensaure, /. pyroracemic acid, pyruvic acid, -weinsaure, /. pyrotartaric acid. [Pg.351]

H00C CH2 CH(C00H).CH2 C00H tricarballylic acid HOOC OH(CHb) CH2 COOH pyrotartaric acid... [Pg.294]

SYNS 1,3-DICYANOPROPANE GLUTARIC ACID D-INITRILE GLUTARODINITRILE GLUTARO-NITRILE PENTANEDINITRILE PYROTARTARIC ACID NITRILE... [Pg.1386]

PYROSULFURYL CHLORIDE see PPR500 PYROSULPHURIC ACID see SOI520 PYROTARTARIC ACID NITRILE see TLR500 PYROTROPBLAU see CMO250 PYROXYLIC SPIRIT see MGB150... [Pg.1860]

While caoutchouc was first obtained by polymerizing isoprene it has been found that other hydrocarbons containing the buta i-ydi-ene group will likewise yield caoutchouc. Such hydrocarbons have been obtained from several sources, e.g., turpentiney petroleuniy coaly acetylene. Also compounds related to succinic acid, e.g., pyrotartaric acid (methyl succinic acid) are possible of transformation into isoprene. Levulinic acid, which is aceto propionic acid, CHa—CO—CH2—CH2—COOH, yields a cyclic sulphur compound, methyl-thiophen (p. 853), which, like methyl pyrrolidine, yields isoprene. Ethyl alcohol by conversion into acetone and then by aldol condensation with ethane yields 2-methyl buta 2-ene, CHa—C = CH—CHa which may be transformed... [Pg.847]

Reference. Original method of Kues and Paal as described and modified by Steinkopf, Die Chemie des Thiophene, Steinkopfif, 1941, page 34. Stcinkopf lists the yield as 116 g. (48%). Calculation of the yield from the reactants listed indicates a 41 % yield. This method is also applicable to production of 3-mcthylthiophciic from pyrotartaric acid. [Pg.2]

For =5, the basicity is 12 (amyl hydride, amyl chloride, amylene chloride, valeronitrilc, valeraldehyde, valeryloxide, angelic acid, pyrotartaric acid anhydride, etc.). [Pg.128]

Pyrolysis, 25, 38 Pyrotartaric acid, 26, 54 Pyrrole, 2,4-dimethyl-3-acetyl-5-... [Pg.60]

Beilstein Handbook Reference) AI3-24247 BRN 1209725 EINECS 203-817-2 Glutaric acid HSDB 5542 NSC 9238 Pentandioic acid Pentanedioic acid 1,5-Pentanedioic acid 1,3-Propanedicarboxylic acid n-Pyrotartaric acid. Needles mp = 97.8 bp = 303° (dec) d = 1,429 very soluble in H2O, EtOH, EtpO soluble in CHCI3, cone, H2SO4 slightly soluble in DMSO, ligroin insoluble In CsHe. [Pg.305]

White powder or crystalline flakes, not entirely stable in daylight. Soluble in dilute nitric acid, sparingly soluble in H3O (solubility at 25°C 0.20 g./lOO g. HgO) insoluble in alcohol, acetone and ether. Decomposes in ammonia and NaOH, yielding AgsO. Evolves CO 3 on dry heating, leaving pyrotartaric acid and Ag as residue, dj 3.432. [Pg.1050]

See also in sourсe #XX -- [ Pg.26 , Pg.54 ]

See also in sourсe #XX -- [ Pg.26 , Pg.54 ]

See also in sourсe #XX -- [ Pg.26 , Pg.54 ]

See also in sourсe #XX -- [ Pg.26 , Pg.54 ]

See also in sourсe #XX -- [ Pg.140 ]

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See also in sourсe #XX -- [ Pg.26 , Pg.54 ]

See also in sourсe #XX -- [ Pg.145 , Pg.199 ]

See also in sourсe #XX -- [ Pg.232 , Pg.312 , Pg.528 , Pg.555 , Pg.589 , Pg.659 ]

See also in sourсe #XX -- [ Pg.93 ]

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