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Influence of the Leaving Group on C–H Activation Pathways in Palladium Pincer Complexes
Organometallics ( IF 2.5 ) Pub Date : 2018-06-26 , DOI: 10.1021/acs.organomet.8b00237
Melissa R. Hoffbauer 1 , Cezar C. Comanescu 1 , Brittany J. Dymm 1 , Vlad M. Iluc 1
Affiliation  

A series of palladium pincer complexes supported by (iPr2P-C6H4)2CH2 (PC(sp3)H2P = bis(2-(diisopropylphosphanyl)phenyl)methane) was isolated and characterized. Different modes of C–H activation were observed for [{PC(sp3)H2P}PdX2] (X = Cl, OTf, Me, OAc). The thermal treatment of [{PC(sp3)H2P}PdX2] (X = Cl, OTf) induced a backbone C–H bond activation to generate the respective [{PC(sp3)HP}PdX] complex, while under similar reaction conditions [{PC(sp3)H2P}PdMe2] underwent a C–C reductive elimination that led to the formation of a Pd(0) dimer, [{PC(sp3)H2P}Pd]2. For the analogous diacetate complex [{PC(sp3)H2P}Pd(OAc)2], the C–H activation occurred at the phosphine isopropyl methine group to generate a palladacycle.

中文翻译:

离去基团对钯钳复合物中CH活化途径的影响

分离并表征了由(i Pr 2 P-C 6 H 42 CH 2(PC(sp 3)H 2 P =双(2-(二异丙基膦基)苯基)甲烷支撑的一系列钯钳形配合物。对[{PC(sp 3)H 2 P} PdX 2 ]观察到不同的C–H活化模式(X = Cl,OTf,Me,OAc)。[{PC(sp 3)H 2 P} PdX 2 ](X = Cl,OTf)的热处理引起骨架C–H键活化,从而生成相应的[{PC(sp 3)HP} PdX]复合物,而在类似的反应条件下[{PC(sp3)H 2 P} PdMe 2 ]经过了C–C还原消除,从而形成了Pd(0)二聚体[{PC(sp 3)H 2 P} Pd] 2。对于类似的二乙酸酯络合物[{PC(sp 3)H 2 P} Pd(OAc)2 ],在膦异丙基次甲基基团上发生CH活化,生成palladacycle。
更新日期:2018-06-27
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