Detail of "1559-88-2"

Reference

Nucleophilic displacement reactions of polyhaloaromatic compounds

Nucleophilic displacement reactions of polyhaloaromatic compounds. Part 2. Kinetics of halogen displacement from bromopolyfluoroaromatic compounds. Bolton, Roger; Sandall, John P. B. (Chem. Dep., Bedford Coll., London, Engl.). J. Chem. Soc., Perkin Trans. 2, (13), 1545-8 (English) 1976. CODEN: JCPKBH. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) The nucleophilic displacement of F and Br from m-C6Br2F4 and from C6BrF5 by NaOMe in butanone-MeOH at 298.degree.K involves competing second-order proceses.Several substances with their cas registry numbers 1559-88-2 and 344-04-7 may be metioned in this study. The rate of nucleophilic displacement of F is more sensitive to substituent effects (.rho. 6.0) than that of Br (.rho. 4.3) in butanone-MeOH (3:1 vol.) at 298.degree.K. Debromination is much more affected by changes in the butanone concn. than is defluorination, and the depression of rate which results from lowering the amt. of ketone in the solvent is far greater than that predicted on the basis of a simple acid-base equil. involving the ketone anion. .

Propene polymerization with Ziegler-type catalysts formed from Me2Si(Ind)2ZrMe2 and cation generating reagents

Propene polymerization with Ziegler-type catalysts formed from Me2Si(Ind)2ZrMe2 and cation generating reagents. Hahn, Sabine; Fink, Gerhard (Max-Planck-Inst. Kohlenforsch., Muehlheim an der Ruhr D-45466, Germany).Chemicals with cas numbers 1559-88-2 and 9002-88-4 also play role. Macromolecular Rapid Communications, 18(2), 117-124 (English) 1997 Huethig & Wepf. CODEN: MRCOE3. ISSN: 1022-1336. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 25 Kinetic and polymer anal. results obtained with the systems Me2Si(Ind)2ZrMe2/[B(C6F4Si(i-Pr)3)4]- [(C6H5)3C]+ (I) and Me2Si(Ind)2ZrMe2/[B(C6F5)4]- [(C6H5)3C]+ (II) in olefin polymns. are compared (Ind = indenyl). Both systems show that the polymn. rate increases with increasing metallocene concn. in a surplus due to the formation of binuclear species. The expected influence of increasing cation-anion distance on the stereo-errors of the poly(propylene)s when changing from system II into I could not be detected. .