For faster navigation, this Iframe is preloading the Wikiwand page for 二溴化钐.

二溴化钐

二溴化钐
英文名 Samarium(II) bromide
别名 溴化亚钐
溴化钐(II)
识别
CAS号 50801-97-3  checkY
ChemSpider 10008489
SMILES
 
  • Br[Sm]Br
InChI
 
  • 1S/2BrH.Sm/h2*1H;/q;;+2/p-2
InChIKey AEPYKHCUOAUXAI-UHFFFAOYSA-L
性质
化学式 SmBr2
摩尔质量 310.17 g/mol[1][2] g·mol⁻¹
外观 棕色晶体[2]
熔点 669 °C(942 K)[2][3]
溶解性 与水反应[2]
磁化率 +5337.0·10−6 cm3/mol [4][5]
危险性
GHS危险性符号
《全球化学品统一分类和标签制度》(简称“GHS”)中有害物质的标签图案
GHS提示词 警告[1]
H-术语 H315, H319, H335[1]
P-术语 P261, P305+351+338[1]
相关物质
其他阴离子 二氯化钐
二碘化钐
其他阳离子 二溴化铕
相关化学品 三溴化钐
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。

二溴化钐是一种无机化合物,化学式为SmBr
2
[6]它在室温下为棕色晶体[2][3]

制备

二溴化钐最初由P. W. Selwood于1934年用氢气还原三溴化钐合成。Kagan通过将氧化钐(Sm2O3)转化为三溴化钐,再用的THF悬浊液还原得到二溴化钐。Robert A. Flowers通过溴化锂二碘化钐在THF中的化学计量比反应得到。Namy用四溴乙烷和金属反应,Hilmerson发现加热这两个混合物可以提高二溴化钐的产量。[7]

应用

二溴化钐可以用作还原剂,但不如二碘化钐那样常见。[8]这可能是由于它只能用于少量的有机溶剂中。但它是和交叉偶联羰基化合物的频哪醇耦合反应的有效试剂。有报道指出二溴化钐在卤代烷的存在下可以选择性地还原酮。[7]

六甲基磷酰胺加入至二溴化钐中,它足以使亚胺还原成胺、将烷基氯化物还原为烃类。[9]然而,在二溴化钐的四氢呋喃溶液中加入六甲基磷酰胺,足以在室温下的两小时内将环己基氯转化成环己醇[10]

如果没有引发剂,二溴化钐会还原四氢呋喃中的酮。[11]

参考文献

  1. ^ 1.0 1.1 1.2 1.3 Samarium(II) bromide 99.95% | Sigma-Aldrich. www.sigmaaldrich.com. [2016-12-20]. (原始内容存档于2019-11-29). 
  2. ^ 2.0 2.1 2.2 2.3 2.4 CRC Handbook of Chemistry and Physics 97th Edition. 2016-06-24: 4–83. ISBN 1-4987-5428-7 (英语). 
  3. ^ 3.0 3.1 Haynes, William M. CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data. 94th. CRC Press. 2013: 86. ISBN 9781466571150. 
  4. ^ Haynes, William M. CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data. 94th. CRC Press. 2013: 135. ISBN 9781466571150. 
  5. ^ Lide, David R. CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data 85th. Boca Raton [u.a.]: CRC Press. 2004: 147. ISBN 9780849304859. 
  6. ^ Elements, American. Samarium Bromide SmBr2. American Elements. [2016-12-20]. (原始内容存档于2019-08-02). 
  7. ^ 7.0 7.1 Skrydstrup, David J. Procter, Robert A. Flowers, Troels. Organic synthesis using samarium diiodide a practical guide. Cambridge: Royal Society of Chemistry. 2009: 157. ISBN 9781847551108. 
  8. ^ Ho, Tse-Lok. Fiesers' Reagents for Organic Synthesis Volume 28. John Wiley & Sons. 2016: 486. ISBN 9781118942819. 
  9. ^ Pecharsky, Vitalij K.; Bünzli, Jean-Claude G.; Gschneidner, Karl A. Handbook on the physics and chemistry of rare earths. Amsterdam: North Holland Pub. Co. 2006: 431. ISBN 9780080466729. 
  10. ^ Couty, Sylvain; Baird, Mark S.; Meijere, Armin de; Chessum, Nicola; Dzielendziak, Adam. Science of Synthesis: Houben-Weyl Methods of Molecular Transformations Vol. 48: Alkanes. Georg Thieme Verlag. 2014: 153. ISBN 9783131722911. 
  11. ^ Brown, Richard; Cox, Liam; Eames, Jason; Fader, Lee. Science of Synthesis: Houben-Weyl Methods of Molecular Transformations Vol. 36: Alcohols. Georg Thieme Verlag. 2014: 129. ISBN 9783131721310. 
{{bottomLinkPreText}} {{bottomLinkText}}
二溴化钐
Listen to this article

This browser is not supported by Wikiwand :(
Wikiwand requires a browser with modern capabilities in order to provide you with the best reading experience.
Please download and use one of the following browsers:

This article was just edited, click to reload
This article has been deleted on Wikipedia (Why?)

Back to homepage

Please click Add in the dialog above
Please click Allow in the top-left corner,
then click Install Now in the dialog
Please click Open in the download dialog,
then click Install
Please click the "Downloads" icon in the Safari toolbar, open the first download in the list,
then click Install
{{::$root.activation.text}}

Install Wikiwand

Install on Chrome Install on Firefox
Don't forget to rate us

Tell your friends about Wikiwand!

Gmail Facebook Twitter Link

Enjoying Wikiwand?

Tell your friends and spread the love:
Share on Gmail Share on Facebook Share on Twitter Share on Buffer

Our magic isn't perfect

You can help our automatic cover photo selection by reporting an unsuitable photo.

This photo is visually disturbing This photo is not a good choice

Thank you for helping!


Your input will affect cover photo selection, along with input from other users.

X

Get ready for Wikiwand 2.0 🎉! the new version arrives on September 1st! Don't want to wait?