Tin−Chalcogen Double-Bond Compounds, Stannanethione and Stannaneselone: Synthesis, Structure, and Reactivities
摘要:
The first isolation of diarylstannanethione (tin-sulfur double-bond compound) and diarylstannaneselone (tin-selenium double-bond compound), Tbt(Ditp)Sn=X (Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl; Ditp = 2,2"-diisopropyl-m-terphenyl-2'-yl; X = S and Se) was accomplished by dechalcogenation of the corresponding highly hindered tetrachalcogenastannolanes, Tbt(Ditp)SnX4. The Sn-119 NMR of stannanethione, Tbt(Ditp)Sn=S, and stannaneselone, Tbt(Ditp)Sn=Se, showed only one low-field broad signal at 531 and 440 ppm, respectively, characteristic of a tricoordinated tin, and hence, the stannanethione and stannaneselone display an intrinsic nature of tin-chalcogen double-bond compounds. The X-ray crystallographic analysis of the isolated stannaneselone, Tbt(Ditp)Sn=Se 5a, revealed a completely trigonal geometry around the central tin with a remarkably short Sn-Se bond length, indicative of structural similarity to a ketone.
TRIARYL PHOSPHINE LIGANDS, PREPARATION METHOD THEREFOR, AND USE IN CATALYSING COUPLING REACTIONS
申请人:DONGGUAN STEPHEN CATALYST CO., LTD.
公开号:US20210147452A1
公开(公告)日:2021-05-20
Provided are triaryl phosphine ligands, as shown in general formulae Ia and Ib, or a mixture thereof, and a preparation method therefor. The invention addresses the deficiencies of biaryl phosphine ligands invented by Buchwald et al. Also provided are a triaryl phosphine coordinated palladium complex, a system composed of triaryl phosphine ligand and a palladium salt or complex, and a use of the triaryl phosphine coordinated palladium complex in catalysing organic reactions, in particular a use in catalysis of coupling reactions involving (pseudo)halogenated aromatic hydrocarbon as substrate.
[EN] TRIARYL PHOSPHINE LIGANDS, PREPARATION METHOD THEREFOR, AND USE IN CATALYSING COUPLING REACTIONS<br/>[FR] LIGANDS DE TRIARYLPHOSPHINE, LEUR PROCÉDÉ DE PRÉPARATION ET LEUR UTILISATION DANS LA CATALYSE DE RÉACTIONS DE COUPLAGE<br/>[ZH] 三联芳单膦配体、它们的制备方法和在催化偶联反应中的用途