• 제목/요약/키워드: zinc borohydride

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수소화붕소아연에 의한 선택환원. 수소화붕소아연의 대표적 유기화합물과의 반응 (Selective Reduction with Zinc Borohydride. Reaction of Zinc Borohydride with Selected Organic Compounds Containing Representative Functional Groups)

  • 윤능민;이호준;김혜규;강재효
    • 대한화학회지
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    • 제20권1호
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    • pp.59-72
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    • 1976
  • 수소화붕소아연의 선택환원성을 조사하기 위하여 대표적 유기화합물 54종을 택하여 수소화붕소 아연과 일정한 조건 (THF 용액, 실온, 수소화이온의 농도 : 0.5M, 유기화합물의 농도 : 0.125M)하에서 반응시켜 대략의 반응속도와 정량관계를 알아보았다.

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Reductive Acetylation of Carbonyl Compounds to Acetates with Pyridine Zinc Borohydride

  • Zeynizadeh, Behzad;Setamdideh, Davood;Faraji, Fariba
    • Bulletin of the Korean Chemical Society
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    • 제29권1호
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    • pp.76-80
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    • 2008
  • Reductive acetylation of a variety of carbonyl compounds such as aldehydes, ketones and a,b-unsaturated enals/enones was carried out efficiently with pyridine zinc borohydride, (Py)Zn(BH4)2, in a mixture of THF-EtOAc at room temperature or under reflux condition. The corresponding acetates were obtained in high to excellent yields. In addition, chemoselective reductive acetylation of aldehydes over ketones was achieved perfectly with the reagent at room temperature.

Stereoselective Reduction of Methyl Vinyl Ketone Dimer

  • Jun, Jong-Gab;Shin, Dong-Gyun;Lee, Chang-Kiu;Sin, Kwan-Seog
    • Bulletin of the Korean Chemical Society
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    • 제11권4호
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    • pp.307-309
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    • 1990
  • The stereoselectivity of the reaction between methyl vinyl ketone dimer, which contains two possible sites of chelation, and zinc borohydride or diisobutylaluminum hydride has been studied in order to illuminate the factors involved in the high levels of asymmetric induction obtained in the bicyclic system. The conditions for the formation of the exo-5,7-dimethyl-6,8-dioxabicyclo[3.2.1]octane are DIBAH reduction of MVK dimer in ether at reflux followed by acidic cyclizatioan, and for the endo isomer are $Zn(BH_4)_2$ reduction with $ZnCl_2$ at $0^{\circ}C.$.

$Zn[BH_4]_2$ 분말의 합성과 열분해 특성 (Synthesis and thermal decomposition of $Zn[BH_4]_2$)

  • 전은;조영환
    • 한국수소및신에너지학회논문집
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    • 제16권3호
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    • pp.262-268
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    • 2005
  • [ $Zn(BH_4)_2$ ](8.4 wt% theoretical hydrogen storage capacity powders have been successfully synthesized by mechanochemical reaction from mixtures of $ZnCl_2$ and $NaBH_4$ powders in a 1:2 molar ratio in different times. $$ZnCl_2+2NaBH_4{\rightarrow}Zn(BH_4)_2+2NaCl$$ (1) $Zn(BH_4)_2$ powders were characterized by X-ray diffractometry(XRD), and Furier Transform Infrared spectrometry(FT-IR). The thermal stabilities of $Zn(BH_4)_2$ powders were studied by Differential scanning calorimetry(DSC), Thermogravimetry analysis(TGA), and Mass spectrometry(MS). $Zn(BH_4)_2$ can be tested for hydrogen evolution without further purification. The reaction to yield hydrogen is irreversible, the other products being compounds of Zn, and borane. $Zn(BH_4)_2$ thermally decomposes to release borane and hydrogen gas between about 85 and 150$^{\circ}C$.