Reference

Problems of the study of rubber traces from a forensic standpoint

Problems of the study of rubber traces from a forensic standpoint. Kaiser, B.; Helbig, W. (Sekt. Kriminalistik, Humboldt-Univ. Berlin, Berlin, Ger. Dem. Rep.). Krim.Several reagents with their cas registry numbers 9003-55-8 and 78-79-5 are used here. Forensische Wiss., 49-50, 29-41 (German) 1983. CODEN: KRFWAG. ISSN: 0023-4702. DOCUMENT TYPE: Journal CA Section: 4 (Toxicology) Rubber samples were extd. with Me2CO at 80° and examd. by disk TLC on silica gel G. CCl4-CHCl3 (1:1) followed by CCl4-CHCl3-Me2CO were the solvent systems. Vulcanizing agents and aging protectors were identified. The rubber samples were ozonolyzed and the products were detd. by TLC on silica gel G, using gasoline-C6H6-EtOAc-AcOH (:2:1) as the solvent system. Succinic acid [110-15-6] was the main product of ozonolysis of 1,4-cis-polybutadiene [9003-17-2] and poly(butadiene-styrene (SBR) [9003-55-8], whereas natural rubber and cis-1,4-polyisoprene [9003-31-0] gave levulinic acid [123-76-2] as the main product of the ozonolysis. SBR was identified by nitration with 65% HNO3 which added p-nitrobenzoic acid [62-23-7] and o-nitrobenzoic acid [552-16-9] to the TLC picture. .

Cryogenic separation of components of aqueous prehydrolysates

Cryogenic separation of components of aqueous prehydrolysates. Porubova, A. T.; Sapotnitskii, S. A. (Leningr. Lesotekh. Akad., Leningrad, USSR). Khim. Pererab. Drev., 93-5. Edited by: Kiprianov, A. I. Leningr. Lesotekh. Akad.: Leningrad, USSR. (Russian) 1983. CODEN: 51GHAL. DOCUMENT TYPE: Conference CA Section: 43 (Cellulose, Lignin, Paper, and Other Wood Products) Section cross-reference(s): 23 Pinewood and larchwood prehydrolyzates contg. carboxylic acids, furfural [98-01-1], and reducing substances were sepd. by freezing at -5 to -25° and thawing at 0 to +8°. Thus, HCO2H [64-18-6], AcOH [64-19-7], and levulinic acid [123-76-2] were sepd. from prehydrolyzates by freezing at -25° and thawing at 3-5, 0-3, at 5-8°, resp. 95% Furfural and 82% reducing substances were sepd. by freezing at -25° and thawing at 0-3°.Except for chemicals metioned above, 64-18-6 and 98-01-1 are also used. .