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
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
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。