Detail of "5408-86-6"

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Stereochemical studies of elimination reactions of 2-bromobutane and 2,3-dibromobutane over bivalent-ion exchanged silica gels

Stereochemical studies of elimination reactions of 2-bromobutane and 2,3-dibromobutane over bivalent-ion exchanged silica gels. Aoki, Yukio; Misono, Makoto; Yoneda, Yukio (Fac. Eng., Univ. Tokyo, Tokyo, Japan). Bull. Chem. Soc. Jpn.Several reagents with their cas registry numbers 14127-61-8 and 5408-86-6 are used here., 49(12), 3437-40 (English) 1976. CODEN: BCSJA8. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) Elimination reactions of 2-bromobutane (I) and 2,3-dibromobutane (II) over silica gels in which silanol protons on the surface were exchanged with bivalent ions such as Ba(II), Ca(II), Mg(II), and Ni(II) were investigated. Dehydrobromination of I proceeded mainly with syn elimination. Debromination by anti mode and nonstereospecific dehydrobromination were obsd. for II. The catalytic activities of these silica gels exhibit reversed volcano-type patterns when they are plotted against the electronegativity of metal ion together with those of alkali-ion exchanged silica gels. Reaction intermediates consistent with the stereochem. obsd. are sec-Bu cation and a bromonium ion, resp., for I and II. .

Dehydrobromination of some dibromobutanes

Dehydrobromination of some dibromobutanes. Levanova, S. V.; Rozhnov, A. M.; Shevtsova, L. A.; Shishinova, V. I. (Kuibyshev. Politekh.Several reagents with their cas registry numbers 5408-86-6 and 107-80-2 are used here. Inst. im. Kuibysheva, Kuibyshev, USSR). Zh. Fiz. Khim., 50(8), 2162 (Russian) 1976. CODEN: ZFKHA9. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) The dehydrobromination of 1,3- and 2,3-dibromobutane was studied at 180-240.degree.; thermodn. calcns. were carried out. .