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Octanuclear Palladacycles with B(3)–H Bond Activation of o-Carborane†

Run-Ze Yuan,Peng-Fei Cui,Yue-Jian Lin,Guo-Xin Jin

Comprehensive Summary Herein, we describe the synthesis of a carborane-supported octanuclear palladacycle complex, Pd 8 ( o -C 2 B 10 H 10 CS 2 CH 3 ) 4 Cl 4 (CH 3 CN) 4 (complex 1 ), with B(3)–H activations on o -carborane ligand. The substitution reaction of 1 has been explored, and three of its substituted complexes Pd 8 ( o -C 2 B 10 H 10 CS 2 CH 3 ) 4 Cl 4 (L) 4 (L = t BuNC, 2 ; L = C 5 H 5 N, 3 ; L = C 4 H 8 S, 4 ) have been synthesized. The m - and p -carborane disubstituted ligands m - and p -C 2 B 10 H 10 (CS 2 CH 3 ) 2 (ligands 5 and 6 ) as well as their B—H activated carborane complexes [ m -C 2 B 10 H 9 (CS 2 CH 3 ) 2 PdCl] ( 7 ) and [ p -C 2 B 10 H 8 (CS 2 CH 3 ) 2 ][PdCl( t BuNC)] 2 ( 8 ) have also been synthesized by the similar method. All of these complexes have been characterized, including X-ray single crystal diffraction, NMR spectroscopy, IR spectroscopy and elemental analysis methods.