substitution. In the solidstate deactivation is effectively suppressed and the active frustrated phosphane/borane Lewis pair splits dihydrogen or adds to sulfur dioxide. A variety of phosphane/B(C6F5)3 pairs have been used to carry out active FLP reactions in the solidstate. The reactions were analyzed by DFT calculations and by solidstate NMR spectroscopy. The solidstate dihydrogen splitting reaction
在溶液中,PCy 3 / B(C 6 F 5)3对通过亲核芳族取代迅速失活。在固态状态下,失活得到有效抑制,活性受阻的膦/硼烷路易斯对分解二氢或添加到二氧化硫中。各种膦/ B(C 6 F 5)3对已用于在固态下进行活性FLP反应。通过DFT计算和固态NMR光谱分析反应。固态二氢裂解反应也在接近室温的条件下进行,其中非猝灭的膦/硼烷混合物悬浮在含氟液体全氟甲基环己烷中。
Reactions of phosphines with electron deficient boranes
作者:Gregory C. Welch、Roberto Prieto、Meghan A. Dureen、Alan J. Lough、Oijsamola A. Labeodan、Thorsten Höltrichter-Rössmann、Douglas W. Stephan
DOI:10.1039/b814486a
日期:——
A series of classical B(C(6)F(5))(3)-phosphine adducts are shown to be reactive molecules. Reaction of (THF)B(C(6)F(5))(3) with phosphines are shown to effect ring-opening of THF affording the zwitterionic phosphonium-borate species of the form R(2)PH(C(4)H(8)O)B(C(6)F(5))(3) and R(3)P(C(4)H(8)O)B(C(6)F(5))(3). Alternatively, treatment of (THF)B(C(6)F(5))(3) with a lithium phosphide (R(2)PLi, R = tBu
作者:Daniel Winkelhaus、Beate Neumann、Hans-Georg Stammler、Norbert W. Mitzel
DOI:10.1039/c2dt30924f
日期:——
The reaction of the Grignardreagent (p-C6F4H)MgBr with Me2SnCl2 afforded the p-C6F4H transfer reagent Me2Sn(p-C6F4H)2 (1). Subsequent reaction of 1 with BCl3 led to the chloroborane (p-C6F4H)2BCl (2), which was converted to the borane [(p-C6F4H)2BH]2 (3) by treatment with the hydride source Me2SiHCl. By reaction of tetrafluoropyridine with i-PrMgCl followed by the in situ reaction with Me2SnCl2, the
格氏试剂(p -C 6 F 4 H)MgBr与Me 2 SnCl 2的反应得到p -C 6 F 4 H转移试剂Me 2 Sn(p -C 6 F 4 H)2(1)。随后1与BCl 3的反应生成氯硼烷(p -C 6 F 4 H)2 BCl(2),后者转化为硼烷[(p -C 6 F通过用氢化物源Me 2 SiHCl处理4 H) 2 BH] 2( 3)。通过四氟吡啶与i-PrMgCl反应,然后与Me 2 SnCl 2原位反应,可以获得锡烷Me 2 Sn(C 5 F 4 N) 2( 4)。然而,这没有与BCl 3反应。所得产物通过元素分析和NMR光谱表征。单晶X-射线衍射实验对化合物进行1, 2和4。确定了已知的化合物Me 2 Sn(C 6 F 5)2(5)的晶体结构,并与1和4的结构进行了比较。
Tuning Lewis acidity using the reactivity of “frustrated Lewis pairs”: facile formation of phosphine-boranes and cationic phosphonium-boranes
作者:Gregory C. Welch、Lourdes Cabrera、Preston A. Chase、Emily Hollink、Jason D. Masuda、Pingrong Wei、Douglas W. Stephan
DOI:10.1039/b704417h
日期:——
phosphonium-boranes [R(3)P(C(6)F(4))B(C(6)F(5))(2)](+) and [R(2)PH(C(6)F(4))B(C(6)F(5))(2)](+) or into the neutral phosphino-boranes R(2)P(C(6)F(4))B(C(6)F(5))(2). This new reactivity provides a modular route to a family of boranes in which the steric features about the Lewisacidic center remains constant and yet the variation in substitution provides a facile avenue for the tuning of the Lewis acidity. Employing
Thermal Rearrangement of Phosphine−B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub> Adducts
作者:Gregory C. Welch、Thorsten Holtrichter-Roessmann、Douglas W. Stephan
DOI:10.1021/ic702485r
日期:2008.3.1
A series of tertiary and secondary phosphine-B(C6F5)3 adducts are shown to undergo facile, thermal-induced rearrangement to give zwitterionic species of the form R3P(C6F4)BF(C6F5)2 and R2PH(C6F4)BF(C6F 5)2, respectively.