Reference

Preparation of positive photoreactive polyimides and their characterization

Preparation of positive photoreactive polyimides and their characterization. Kubota, Shigeru; Moriwaki, Toshimoto; Ando, Torahiko; Fukami, Akira (Polym. Eng. Dep., Mitsubishi Electr. Corp.Chemicals with cas numbers 108136-22-7 and 108058-07-7 also play role., Amagasaki 661, Japan). J. Appl. Polym. Sci., 33(5), 1763-75 (English) 1987. CODEN: JAPNAB. ISSN: 0021-8995. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 74 Polyimide precursors were synthesized from a diamine and a diacid chloride from the reaction of pyromellitic dianhydride [89-32-7] and o-nitrobenzyl alc. [612-25-9]. Their thermal properties were studied in N using dynamic thermogravimetry, and the photoreaction mechanism was investigated by UV and IR spectrophotometry. The polyimide precursors were spin-coated onto Si wafers, prebaked, and then exposed to UV light from a high-pressure Hg-Xe lamp. When the films were dipped into 2% aq. KOH after irradn., the exposed area dissolved forming high resoln. patterns. Relative sensitivities of the polymers were detd. .

Metabolism of nitrotoluenes by freshly isolated Fischer 344 rat hepatocytes

Metabolism of nitrotoluenes by freshly isolated Fischer 344 rat hepatocytes. DeBethizy, J. Don; Rickert, Douglas E. (Dep. Gen. Biochem. Toxicol., Chem. Ind. Inst. Toxicol., Research Triangle Park, NC 27709, USA). Drug Metab. Dispos., 12(1), 45-50 (English) 1984. CODEN: DMDSAI. ISSN: 0090-9556. DOCUMENT TYPE: Journal CA Section: 4 (Toxicology) Hepatocytes were incubated with U-14C-labeled 2-nitrotoluene (I)(2NT) [88-72-2], 3-nitrotoluene (3NT) [99-08-1], or 4-nitrotoluene (4NT) [99-99-0] at concns. from 25 to 1000 mM for up to 60 min. 2NT was converted to 2-nitrobenzyl alc.In this article, certain chemicals are used. Some of their cas registry numbers are 89076-35-7 and 612-25-9 [612-25-9] (52%), 2-nitrobenzyl alc. glucuronide [89076-33-5] (28%), an unidentified metabolite (20%), and 2-nitrobenzoic acid [552-16-9] (3%). Metabolites from 3NT were 3-nitrobenzoic acid [121-92-6] (56%), 3-nitrobenzyl alc. [619-25-0] (29%), and 3-nitrobenzyl alc. glucuronide [89076-34-6] (13%). 4NT was metabolized to S-(4-nitrobenzyl)glutathione [6803-19-6] (68%), 4-nitrobenzyl alc. [619-73-8] (12%), sulfate [89090-09-5] and glucuronide [89076-35-7] conjugates of 4-nitrobenzyl alc. (6%), and 4-nitrobenzoic acid [62-23-7] (2%) (expressed as percentage of total metab.). The formation of the resp. nitrobenzyl alcs. by hepatocytes was linear with respect to time for 15-20 min. The formation of other metabolites was linear over a 45-min incubation period. Incubation of 2NT, 3NT, or 4NT (1 mM) with rat hepatic microsomes produced only the resp. nitrobenzyl alcs. and the rate of formation was linear for 90 min. Thus, each nitrotoluene isomer is metabolized to the corresponding benzyl alc., but substantial differences in the metab. of the benzyl alcs. exist. .