二溴化釤

二溴化釤
英文名	Samarium(II) bromide
別名	溴化亞釤; 溴化釤(II)
識別
CAS號	50801-97-3
ChemSpider	10008489
SMILES	Br[Sm]Br;
InChI	1S/2BrH.Sm/h2*1H;/q;;+2/p-2;
InChIKey	AEPYKHCUOAUXAI-UHFFFAOYSA-L
性質
化學式	SmBr2
莫耳質量	310.17 g/mol g·mol⁻¹
外觀	棕色晶體
熔點	669 °C（942 K）
溶解性（水）	與水反應
磁化率	+5337.0·10−6 cm3/mol
危險性
	GHS危險性符號;
GHS提示詞	警告
H-術語	H315, H319, H335
P-術語	P261, P305+351+338
相關物質
其他陰離子	二氯化釤; 二碘化釤
其他陽離子	二溴化銪
相關化學品	三溴化釤
	若非註明，所有數據均出自標準狀態（25 ℃，100 kPa）下。

二溴化釤是一種無機化合物，化學式為SmBr
2。^[6]它在室溫下為棕色晶體。^[2]^[3]

製備

二溴化釤最初由P. W. Selwood於1934年用氫氣還原三溴化釤合成。Kagan通過將氧化釤（Sm₂O₃）轉化為三溴化釤，再用鋰的THF懸濁液還原得到二溴化釤。Robert A. Flowers通過溴化鋰和二碘化釤在THF中的化學計量比反應得到。Namy用四溴乙烷和金屬釤反應，Hilmerson發現加熱這兩個混合物可以提高二溴化釤的產量。^[7]

應用

二溴化釤可以用作還原劑，但不如二碘化釤那樣常見。^[8]這可能是由於它只能用於少量的有機溶劑中。但它是醛、酮和交叉偶聯羰基化合物的頻哪醇耦合反應的有效試劑。有報道指出二溴化釤在鹵代烷的存在下可以選擇性地還原酮。^[7]

將六甲基磷醯胺加入至二溴化釤中，它足以使亞胺還原成胺、將烷基氯化物還原為烴類。^[9]然而，在二溴化釤的四氫呋喃溶液中加入六甲基磷醯胺，足以在室溫下的兩小時內將環己基氯轉化成環己醇。^[10]

如果沒有引發劑，二溴化釤會還原四氫呋喃中的酮。^[11]

參考文獻

^ ^1.0 ^1.1 ^1.2 ^1.3 Samarium(II) bromide 99.95% | Sigma-Aldrich. www.sigmaaldrich.com. [2016-12-20]. （原始內容存檔於2019-11-29）.
^ ^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 （英語）.
^ ^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.
^ 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.
^ 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.
^ Elements, American. Samarium Bromide SmBr2. American Elements. [2016-12-20]. （原始內容存檔於2019-08-02）.
^ ^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.
^ Ho, Tse-Lok. Fiesers' Reagents for Organic Synthesis Volume 28. John Wiley & Sons. 2016: 486. ISBN 9781118942819.
^ 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.
^ 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.
^ 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.

[sigmaaldrich-1] 1.0 ^1.1 ^1.2 ^1.3 Samarium(II) bromide 99.95% | Sigma-Aldrich. www.sigmaaldrich.com. [2016-12-20]. （原始內容存檔於2019-11-29）.

[CRC_Handbook_of_Chemistry_and_Physics_97th_Edition-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 （英語）.

[book2-3] 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.

[American_elements-6] Elements, American. Samarium Bromide SmBr2. American Elements. [2016-12-20]. （原始內容存檔於2019-08-02）.

[book-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.

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