Reference

Novel solvent extraction of lindane from soil

Novel solvent extraction of lindane from soil. Westcott, Neil D.; Worobey, Brian L. (Res. Stn., Agric. Canada, Saskatoon, SK S7N 0X2, Can.). J. Agric. Food Chem., 33(1), 58-60 (English) 1985. CODEN: JAFCAU. ISSN: 0021-8561. DOCUMENT TYPE: Journal CA Section: 5 (Agrochemical Bioregulators) Section cross-reference(s): 19 BF3-MeOH [373-57-9], a reagent useful for esterifing acids, was used as a pretreatment for the extn. of lindane (I) [58-89-9] residues from soil. BF3-MeOH pretreatment resulted in an increase of I extd. from field-weathered soils of 20-70% compared to extn. with hexane-acetone. The I that was unextractable by hexane-acetone but was extractable with the BF3-MeOH treatment was confirmed by chem. and mass spectral methods.

The effect of modifiers on carbonization of polyacrylonitrile fibers

The effect of modifiers on carbonization of polyacrylonitrile fibers. Laszkiewicz, Bogumil; Pabin-Szafko, Barbara (Pol.). Prepr. - Mezhdunar. Simp. Khim. Voloknam, 2nd, Volume 4, 285-91. Program. Kom. Mezhdunar. Simp. Khim. Voloknam: Kalinin, USSR. (English) 1977. CODEN: 37KQAK. DOCUMENT TYPE: Conference CA Section: 39 (Textiles) In the preliminary carbonization of acrylic fibers, the modifiers BF3.Et2O [109-63-7], BF3.EtOH [353-41-3], and BF3.MeOH [373-57-9] lowered the value of the thermal effect of cyclization as well as the activation energy of the degradative process, with the activation energies of degrdn. being 37, 28, and 23 kcal/mol, resp., compared to 56 kcal/mol, for unmodified fibers. An ionic mechanism was proposed for the preliminary carbonization reaction. The BF3.Et2O complex caused the temp. of the exothermic effect startup to drop to a greater extent than the complexes with EtOH and MeOH whose actions were almost identical.