Preparation and NMR Spectroscopy of (1,2-Bis(diphenylphosphino)ethane)(η<sup>3</sup>-1,3-diarylallyl)- palladium Tetrafluoroborates. Correlation of Chemical Shifts with Hammett Substituent Constants and with the Regioselectivity of Nucleophilic Attack
13C NMR chemical shifts of the terminal allyl carbon atoms C-1 and C-3 of (1,2-bis(diphenylphosphino)ethane)(η3-1,3-diarylallyl)palladium tetrafluoroborates correlate with σ Hammett substituent constants. For each complex the chemical shift at lower field indicates the site of preferred attack by soft nucleophiles in the Tsuji−Trost reaction.
Solvent-free and catalyst-free direct alkylation of alkenes
作者:Meng-Yao Li、Jiatong Li、Ao Gu、Xiao-Mei Nong、Shuyang Zhai、Zhu-Ying Yue、Chen-Guo Feng、Yingbin Liu、Guo-Qiang Lin
DOI:10.1039/d3gc02685j
日期:——
A convenient method for synthesizing aryl-containing trisubstituted alkenes through directalkylation of alkenes was successfully achieved under solvent-free and catalyst-free conditions. The absence of solvents was found to be crucial in initiating this sequence. Moreover, this protocol stands out due to its minimal waste production and straightforward operation. The radical capture experiment provided