Detail of "931-64-6"

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Factors influencing the rate of tungsten hexachloride/tetramethyltin-catalyzed olefin metathesis polymerization: monomer ring strain is not important

Factors influencing the rate of tungsten hexachloride/tetramethyltin-catalyzed olefin metathesis polymerization: monomer ring strain is not important. Patton, Penelope A.Several substances are used for example 931-64-6 and 594-27-4 which are their cas registry numbers.; McCarthy, Thomas J. (Polym. Sci. Eng. Dep., Univ. Massachusetts, Amherst, MA 01003, USA). Macromolecules, 20(4), 778-82 (English) 1987. CODEN: MAMOBX. ISSN: 0024-9297. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Competitive kinetics in WCl6-Me4Sn [594-27-4]-catalyzed olefin metathesis copolymns. demonstrates that monomer ring strain does little to affect reaction rates. The species in the catalytic cycle that appears to be kinetically pertinent is the metal carbene; the nature and geometry of the growing polymer chain about the catalyst and specifically the ability of the penultimate double bond to coordinate to the metal det. the reactivity of the metal carbene toward monomer. Relative reactivities for carbenes derived from cyclobutene [822-35-5], cyclopentene [142-29-0], cyclohexene [110-83-8], cycloheptene [628-92-2], cyclooctene [931-88-4], 1,5-cyclooctadiene [111-78-4], cyclodecene [3618-12-0], cyclododecene [1501-82-2], norbornene [498-66-8], bicyclo[2.2.2]oct-2-ene [931-64-6], and a-pinene [80-56-8] are detd. .

Vibrational spectroscopic study of the three solid phases of bicyclo[2

Vibrational spectroscopic study of the three solid phases of bicyclo[2.2.2]octene. Kawai, Nancy T.; Butler, Ian S.; Gilson, Denis F. R. (Dep. Chem., McGill Univ., Montreal, PQ H3A 2K6, Can.). J. Raman Spectrosc., 23(1), 29-35 (English) 1992. CODEN: JRSPAF. ISSN: 0377-0486. DOCUMENT TYPE: Journal CA Section: 73 (Optical, Electron, and Mass Spectroscopy and Other Related Properties) The three solid phases of bicyclo[2.2.2]oct-2-ene were characterized by vibrational spectroscopy at low temp. and high pressures. Bicyclooctene undergoes a phase transition at 176 K on cooling (phase I ? phase II) and then another at ca 95 K (phase II ? phase III). There are some commonly used reagents like 931-64-6 in this article. On compression at room temp., these same transitions occur at 7.9 ± 1.0 kbar and 15 kbar. The low-frequency Raman spectra show that phase I is isotropically disordered, whereas phase II is anisotropically disordered. The crystal structure of phase II is, however, similar to that of phase III, and is suggested to be tetragonal. .