A New Convenient Synthesis of Triarylbismuthanes Bearing Three Different Aryl Groups by the Grignard Arylation of Unsymmetrical Diarylbismuth Triflate−Hexamethylphosphoric Triamide (HMPA) Complexes
Triarylbismuthanes bearing three different aryl groups, Ar1Ar2Ar3Bi (4), have been conveniently synthesized by the action of aryl Grignard reagent Ar3MgBr on unsymmetrical diarylbismuth triflate−HMPA complexes Ar1Ar2BiOTf(HMPA)2 (8), which are readily accessible by the selective cleavage of triarylbismuthanes Ar12Ar2Bi (7; Ar1 is more fugacious than Ar2) with trimethylsilyl triflate in the presence
Triarylbismuthanes轴承三个不同的芳基中,Ar 1的Ar 2的Ar 3的Bi(4),已被方便地通过芳基格氏试剂的Ar的作用合成的3 MgBr上不对称diarylbismuth三氟甲磺酸酯-HMPA络合物的Ar 1的Ar 2 BiOTf(HMPA)2(8),可通过在HMPA存在下用三氟甲硅烷基三氟甲硅烷基选择性地裂解三芳基双muthanes Ar 1 2 Ar 2 Bi(7 ; Ar 1比Ar 2更具逸度)来获得。
Synthesis and Stereochemical Behavior of Unsymmetrical Tetraarylbismuthonium Salts
作者:Yoshihiro Matano、Shameem Ara Begum、Takashi Miyamatsu、Hitomi Suzuki
DOI:10.1021/om990597v
日期:1999.12.1
bromide 16b coalesced in pyridine-d5, 1,2-dichlorobenzene-d4, chlorobenzene-d5, and toluene-d8. The coalescence temperature (Tc) depended on the nucleophilicity of the counteranions as well as on the polarity of the solvents; Tc decreased as the nucleophilicity of the counteranions increased or as the polarity of the solvent decreased. Thus, the configuration at bismuth in tetrafluoroborates 14 and tosylate