Synthesis, Characterization, and Reactivity of Cationic Gold Diarylallenylidene Complexes
作者:Nana Kim、Ross A. Widenhoefer
DOI:10.1002/anie.201713209
日期:2018.4.16
Methoxide abstraction from gold acetylide complexes of the form (L)Au[η1‐C≡CC(OMe)ArAr′] (L=IPr, P(tBu)2(ortho‐biphenyl); Ar/Ar′=C6H4X where X=H, Cl, Me, OMe) with trimethylsilyl trifluoromethanesulfonate (TMSOTf) at −78 °C resulted in the formation of the corresponding cationic gold diarylallenylidene complexes [(L)Au=C=C=CArAr′]+ OTf− in ≥85±5 % yield according to 1H NMR analysis. 13C NMR and IR
由Au [η形式(L)的金络合物乙炔化甲醇抽象1 -C≡CC(OME)Arar的'](L =的IPr,P(吨丁基)2(邻= C;氩气/氩-联苯基)' 6 H 4 X,其中X = H,Cl,Me,OMe)与三甲基甲硅烷基三氟甲磺酸盐(TMSOTf)在-78°C形成相应的阳离子金二芳基亚芳基亚烷基络合物[(L)Au = C = C = CArAr'] + 光学传递函数-在≥85±5%的产率,根据1点H NMR分析。13这些络合物的13 C NMR和IR光谱分析确定了C1和C3烯基亚碳原子上正电荷的芳烃依赖性离域。所述diphenylallenylidene配合物[(IPR)的Au = C = C =器CPh 2 ] + 光学传递函数-反应用亲核试剂的杂原子在allenylidene C1和/或C3碳原子上。
Cationic gold vinyl carbene/allylic cation complexes of the form (E)-[(L)AuC(H)C(H)CAr2]+ OTf− L = IPr, Ar = Ph [(E)-5a], L = IPr, Ar = 4-C6H4OMe [(E)-5b], L = P(t-Bu)2o-biphenyl, Ar = 4-C6H4OMe [(E)-5c]} were generated in solution via Lewis acid-mediated ionization of the corresponding gold (γ-methoxy)vinyl complexes (E)-(L)AuC(H)C(H)C(OMe)Ar2 at or below −95 °C. Complexes (E)-5b and (E)-5c were
( E )-[(L)AuC(H)C(H)CAr 2 ] + OTf - L = IPr, Ar = Ph [( E )- 5a ], L形式的阳离子金乙烯基卡宾/烯丙基阳离子配合物= IPr, Ar = 4-C 6 H 4 OMe [( E )- 5b ], L = P( t -Bu) 2邻联苯, Ar = 4-C 6 H 4 OMe [( E )- 5c ]}通过路易斯酸介导的相应金 (γ-甲氧基) 乙烯基络合物 ( E )-(L)AuC(H)C(H)C(OMe)Ar 2的电离在溶液中产生-95 °C 或以下。配合物 ( E )- 5b和 ( E )- 5c在溶液中使用多核 NMR 光谱进行了充分表征,这确定了金烯丙基阳离子共振结构的主要贡献以及正电荷在 γ-茴香环中的显着分布。配合物 ( E )- 5b在 -95 °C 下与仅在乙烯基卡宾部分的 C1 位上的中性双电子、氢化物和氧原子
Synthesis and Characterization of Hexafluorocyclopentane‐Bridged Bisbutatrienes as Models for Longer Cumulenes: Various Transformations for the Construction of π‐Conjugated Frameworks
research, the hexafluorocyclopentane-bridged bisbutatrienes were synthesized. They underwent various cyclizations to construct fulvene, pentalene, germacycle, benzocyclobutene, and cyclooctatetraene frameworks.