The preparation of Lewis-acid–base adducts of the type R3SbHgX2(R = phenyl, o- and p-tolyl; X = Cl, Br, and I) are reported. Reaction of the o-tolylstibine with HgCl2 in benzene yields Hg2Cl2 and R3SbCl2. In tetrahydrofuran the reaction products are R2SbCl and RHgCl. These results are interpreted in terms of a scrambling occurring via a five-co-ordinate antimony labile intermediate formed via oxidative
First synthesis and properties of dendritic Bin-bismuthanes
作者:Hitomi Suzuki、Haruto Kurata、Yoshihiro Matano
DOI:10.1039/a706338e
日期:——
Directed tris-ortholithiation of tris[2-(diethylaminosulfonyl)phenyl]bismuthane 1 with tert-butyllithium followed by treatment with 3 equiv. of bis[2-(diethylaminosulfonyl)phenyl]bismuth iodide 2a gives a symmetrically branched Bi4-bismuthane 5a, which, on a similar treatment, is converted in a one-pot synthesis into a highly branched Bi10-bismuthane 6a.
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 of (formylferrocenyl)bismuthanes. A way to control the stereochemistry at the chiral bismuth centre using hypervalent bond formation and planar chirality of ferrocene
Induction of chirality at a bismuth centre is found to occur with exclusive stereoselectivity by using planar chirality of ferrocene as a chiral auxiliary.
How formation of an intramolecular coordinate bond affects the molecular structure was examined in the structural comparison of 2â²-diethylboryl-4â³-dimethylaminochalcone (1) and 2â²-ethylenedioxyboryl-4â³-dimethylaminochalcone (2) with chloro- 2-[(4-dimethylaminostyryl) carbonyl]phenyl}(4-methyl- phenyl)]bismuthane (3) and 4â³-dimethylaminochalcone (4).