950492-55-4

Upstream product

• 950492-53-2 {[η⁶-3,5-Me₂C₆H₃-CMe₂-η⁵-C₅H₄]TaPr}[B(C₆F₅)4] 
• 1333-74-0 hydrogen 

Downstream Products

• 1394020-38-2 {[η⁶-3,5-Me₂C₆H₃-CMe₂-η⁵-C₅H₄]Ta(cyclopentyl)}[B(C₆F₅)₄] 
• 1394020-40-6 {[η⁶-3,5-Me₂C₆H₃-CMe₂-η⁵-C₅H₄]Ta(4-methylpentyl)}[B(C₆F₅)₄] 
• 1394020-43-9 {[η⁶-3,5-Me₂C₆H₃-CMe₂-η⁵-C₅H₄]TaCH(Me)Ph}[B(C₆F₅)₄] 

Relevant academic research and scientific papers

Ansa-cyclopentadienyl-arene tantalum complexes: Structure and reactivity of neutral, cationic, and dicationic derivatives

The cationic tantalum complex {[η6-Ar-CMe 2-η5-C5H4]TaPr}[B(C 6F5)4] (1; Ar = 3,5-Me2C 6H3) serves as a starting material for a series of neutral, monocationic, and dicationic derivatives. The cationic hydride {[η6-Ar-CMe2-η5-C5H 4]TaH}[B(C6F5)4] (2) that results from hydrogenolysis of 1 inserts the di- and trisubstituted olefins cyclopentene and 2-methyl-2-pentene; it reacts with styrene to give the 2,1-insertion product, for which the Ta-CH(Me)Ph group is bound in a σ3- allylic fashion. A neutral complex is obtained from 1 by reaction with Br -, and a dicationic derivative is available by hydride abstraction from 2 using the Lewis acidic trityl cation. All compounds described here retain the unusual ansa-(η5-cyclopentadienyl, η6-arene) coordination mode of the ligand that stabilizes the formally Ta(III) center. X-ray structures and DFT calculations show that the metal-arene interaction contains a significant π back-donation component (arene←Ta(III)) that differs only slightly in the series, despite the variation of charge at the metal center.