• Title/Summary/Keyword: 브롬

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Crystal Structure of a Bromine Sorption Complex of Dehydrated Calcium and silver Exchanged Zeolite A (칼슘 및 은 이온으로 치환된 제올라이트 A를 탈수한 후 브롬을 흡착한 결정구조)

  • Bae, Myung-Nam;Kim, Un-Sik;Kim, Yang
    • Korean Journal of Crystallography
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    • v.8 no.2
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    • pp.127-131
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    • 1997

  • The crystal structure of a bromine sorption complex of vacuum-dehydrated Ag+ and Ca2+ exchanged zeolite A(a=12,234(1) Å) has been determined by single-crystal X-ray diffraction methods in the cubic space group Pm3m. The crystal was prepared by flow method using exchange solution in which mole ratio of AgNo3 and Ca(NO3)2 was 1:150 with a total concentration of 0.05M. The crystal was dehydrated at 360℃ and 2 ×10-6 Torr for 2days, followed by exposure to 180 Torr of Br2 vapor for 20min. full-matrix least-squares refinements converged to the final error indices of R1=0.111 and R2=0.101 using 90 reflections for which I>3o(I). About 3.1 Ag+ ions and 4.45 Ca2+ ions lie on the two crystallographically nonequivalent three-fold axes associated with 6-ring oxygens. A total of six bromine molecules are sorbed per unit cell. Each bromine molecule approaches a framework oxide ions axially (Br-Br-O=171(2)', O-Br=3.25(6) Å; and Br-Br=2,61(8) Å by a charge-transfer interaction.

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Halogen Exchange Reactions of Benzyl Halides Part Ⅱ-Kinetics of Reactions of Iodide Ion with Benzyl Chloride and Bromide in 90% Ethanol-water (벤질 할라이드의 할로겐 교환반응 (제Ⅱ보) 90% 에탄올 용액에서의 염화 및 브롬화 벤질과 요오드화 이온 간의 교환반응 속도)

  • Lee Bon-su;Whangbo Myung Hwan;Lee Ik Choon
    • Journal of the Korean Chemical Society
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    • v.13 no.2
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    • pp.103-108
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    • 1969

  • 전보에 이어 90% 에탄올 용액에서의 염화 벤질 및 브롬화 벤질과 요오드화 이온 간의 교환반응을 연구하였다. HSAB이론을 도입하여 할로겐화 이온의 pb혼합 궤도가 서로 겹치는 전이 상태로서 실험 결과를 설명하였다.

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Debromination of 3-(1,2-Dibromo-2-methylpropyl)-1,2-isoxazolines to 3-(2-Methyl-1-propenyl)-1,2-isoxazolines by Sodium Thiolates (3-(1,2-디브로모-2-메틸프로필)-1,2-이속사졸린들의 나트륨 티올레이트들에 의한 탈브롬화 반응을 통한 3-(2-메틸-1-프로페닐)-1,2-티올레이트들에 의한 탈브롬화 반응을 통한 3-(2-메틸-1-프로페닐)-1,2-이속사졸린들로의 변환반응)

  • Kim, Hyeong Cheol;Jo, Su Yeon;Jeon, Dong Ju;Kim, Hyeong Rae
    • Journal of the Korean Chemical Society
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    • v.45 no.6
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    • pp.608-611
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    • 2001

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The Syntheses of Organostannyl Compounds by Grignard Reaction Catalyzed by Ether in Non-ethereal Media (비에테르성 용매중에서 에테르촉매를 사용한 그리냐르반응에 의한 유기스탄닐화합물의 합성)

  • Bae Seok Seo;Il Kyu Lee
    • Journal of the Korean Chemical Society
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    • v.23 no.6
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    • pp.392-395
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    • 1979

  • Some alkyl or aryl halides, such as ethyl bromide, butyl chloride, phenyl bromide and benzyl chloride, were reacted by Grignard's method with anhydrous tin tetrachloride in hydrocarbon media. When small amounts of ether were added into the Grignard reaction step, the reaction proceeded rather smoothly and gave good yields of corresponding organotin compounds.

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타이어 인너라이너 재료로서의 할로겐화부틸고무

  • Choe, Se-Yeong
    • The tire
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    • s.144
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    • pp.2-5
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    • 1989

  • '본고는 타이어의 인너라이너 재료로서 널리 각광을 받고 있는 브롬화부틱고무, 염화부틸고무의 화학 및 배합이론과 이들 단일배합 및 천연고무와의 블렌드가공과 가황특성에 대하여 검토한 Canada Polysar Limited의 J. Walker의 보고를 요약한 것이다.'

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