Boron azides in Staudinger oxidations and cycloadditions
作者:Rebecca L. Melen、Alan J. Lough、Douglas W. Stephan
DOI:10.1039/c3dt50791b
日期:——
and a cycloaddition reaction has taken place. However, if the Staudinger reaction is prohibited via phosphine oxidation as in the case of (EtO)2P(O)CCP(O)(OEt)2 then the unusual dimeric product 4 [2-(C6F5)2B-4-(P(O)OEt2)-2H-1,2,3-triazole-5-P(O)(OEt)(OB(C6F5)2)] is generated. The structures of 1b–d, 2b–d, 3 and 4 have been determined by X-ray diffraction.
Cy 2 BN 3与三取代膦的斯托丁格反应(R 3 P)产生了硼-氮-磷连接系统Cy 2 BN PR 3(分别为Et,t Bu,Cy,Ph)(分别为1a-1d)。类似地,(C 6 F 5)2 BN 3与膦P t Bu 3,PPh 3,Ph 2 PC CPh和Ph 2 PC CPPh 2的反应产生(C 6 F 5)2 BNPR 3(分别为2a–d)。相反,(C反应6 ˚F 5)2 BN 3的Ph 2 P-Ç Ç p -tol在过量的Me存在3的SiN 3,得到双环产物3 [1-(C 6 ˚F 5)2乙-4-(对甲苯基)-1 H -1,2,3-三唑-5-P(NH)Ph 2 ],其中施陶丁格和环加成反应均已发生。但是,如果史陶丁格反应是通过以下方式禁止的(EtO)2 P(O)C CP(O)(OEt)2的情况下进行膦氧化,然后生成不寻常的二聚产物4 [2-(C 6 F 5)2 B-4-(P(O)OEt
1,1-Alkenylboration of diarylphosphino-enynes: convenient synthetic entry to vicinal P/B Lewis pairs at extended conjugated π-frameworks
作者:Guo-Qiang Chen、Gerald Kehr、Constantin G. Daniliuc、Gerhard Erker
DOI:10.1039/c4ob02134g
日期:——
Alkenylboranes R-CHCH-B(C6F5)2 undergo carbon–carbon coupling by means of 1,1-alkenylboration with diarylphosphino-enynes to give conjugated hexatriene derivatives that bear a vicinal pair of B(C6F5)2 and PAr2 functionalities at the framework.
A Convenient and Direct Route to Phosphinoalkynes via Copper-Catalyzed Cross-Coupling of Terminal Alkynes with Chlorophosphanes
作者:Irina P. Beletskaya、Vladimir V. Afanasiev、Marina A. Kazankova、Irina V. Efimova、Mikhail U. Antipin
DOI:10.1055/s-2003-42493
日期:——
A new efficient method to obtain various alkynylphosphanes RnP(-R′)3-n [R = Ar, Alk, alkoxy, amido R′ = Ar, Het, Alk, CH2Z (Z = OMe, NMe2), n = 0-2] has been developed by means of cross-coupling reaction of chlorophosphanes RnPCl3-n (R = Ar, Alk, Alkoxy) with terminal alkynes catalyzed by cuprous salts.
properties of the uncoordinated alkyne in these newrheniumcomplexes was analyzed, based on 13C NMR data and was compared with reported data on iron complexes. The results obtained indicate that the electronic characteristics of uncoordinated alkynes are similar in both families of complexes. Thus, the different reactivity observed between rhenium and iron complexes is related to the different nature of metallic
Reactivity of an Intramolecular Fluorophosphonium Fluoroborate
作者:Olga Ekkert、Christopher B. Caputo、Conor Pranckevicius、Constantin G. Daniliuc、Gerald Kehr、Gerhard Erker、Douglas W. Stephan
DOI:10.1002/chem.201403110
日期:2014.9.1
The reactions of the intramolecular frustrated Lewis pair‐adduct Ph2PC(p‐Tol)C(C6F5)B(C6F5)2(CNtBu) with XeF2 gave Ph2P(F)C(p‐Tol)C(C6F5)B(F)(C6F5)2 (3). This species reacts with two equivalents of Al(C6F5)3⋅C7H8 producing the salt, [Ph2P(F)C(p‐Tol)C(C6F5)B(C6F5)2][F(Al(C6F5)3)2] (4), whereas reaction with HSiEt3/B(C6F5)3 gave Ph2P(F)C(p‐Tol)C(H)B(C6F5)3 (5). The photolysis of 3 resulted in aromatization
分子内受阻的Lewis对加合物Ph 2 PC(p - Tol)C(C 6 F 5)B(C 6 F 5)2(CN t Bu)与XeF 2的反应得到Ph 2 P(F)C (p- Tol)C(C 6 F 5)B(F)(C 6 F 5)2(3)。本种用Al(C两个当量进行反应6 ˚F 5)3 ⋅C 7 ħ 8制备的盐,[PH 2 P(F)C(p- Tol)C(C 6 F 5)B(C 6 F 5)2 ] [F(Al(C 6 F 5)3)2 ](4),而与HSiEt 3 / B(C 6 F 5)3得到Ph 2 P(F)C(p- Tol)C(H)B(C 6 F 5)3(5)。3的光解导致芳构化,从而得到菲咯啉衍生物Ph 2 P(F)C(p ‐Tol(o-C 6 F 4))CB(F)(C 6 F 5)2(6)。