Lewis and Brønsted basicity of phosphine-diazomethane derivatives
作者:Carolin Schneider、James H. W. LaFortune、Rebecca L. Melen、Douglas W. Stephan
DOI:10.1039/c8dt02420k
日期:——
EtOC(O)CHNNPR3 (R = Ph 1, Cy 2, tBu 3) were prepared via the reactions of the diazomethane and a phosphine. In subsequent reactions with B(C6F5)3, the compounds 2 and 3 are shown to exhibit Lewis basicity at the carbonyl oxygen affording EtOC(O(B(C6F5)3))CHNNPR3 (R = Cy 5, tBu 6). Reactions of 5 and 6 with water or phenol illustrated the Brønsted basicity at the nitrogen atom adjacent phosphorus, affording the
通过重氮甲烷与膦的反应制备化合物EtOC(O)CHNNPR 3(R = Ph 1,Cy 2,t Bu 3)。在随后与B(C 6 F 5)3的反应中,化合物2和3在羰基氧上显示出路易斯碱性,从而提供EtOC(O(B(C 6 F 5)3))CHNNPR 3(R = Cy 5,t Bu 6)。5和的反应用水或苯酚进行的图6说明了在邻近磷的氮原子处的布朗斯台德碱度,得到了化合物[EtOC(O)CHNNHPR 3 ] [HOB(C 6 F 5)3 ](R = Cy 7,t Bu 8)和[ EtOC(O)CHNNHPR 3 ] [PhOB(C 6 F 5)3 ](R = Cy 9,t Bu 10)。这些产品的配方已通过光谱学和晶体学研究得到证实,并从计算中获得了见识。
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.
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。
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