Synthesis and properties of bis(pentamethylcyclopentadienyl) actinide hydrocarbyls and hydrides. A new class of highly reactive f-element organometallic compounds

Supported Single-Site Organometallic Catalysts for the Synthesis of High-Performance Polyolefins

“…No evidence of Cp* protonation or redox processes are observed. Interestingly, homogeneous solutions of Cp 2 * Th(CH 3 ) 2 are minimally active for ethylene polymerization and olefin hydrogenation [100][101][102][103][104]. On the other hand, on adsorption DA results in a profound increase in catalytic activity [86,105].…”

A DFT and experimental investigation of the electron affinity of the triscyclopentadienyl uranium complexes Cp3UX

“…Some years later, the bispentamethylcyclopentadienyl compound Cp* 2 UCl 2 (Cp* = C 5 Me 5 ) was found to be, as well as Cp 3 UCl, the precursor of an important family of derivatives. 5 The recent period is marked by the speeding up of emergence of new classes of organo-uranium compounds. Low-valent complexes, some of these appearing to have a much lower oxidation state than in reality, such as Cp* 2 U(terpy), 6 show a fascinating reductive capacity, in particular in the activation of small molecules.…”

Preparation and Reactions of Base-Free Bis(1,2,4-tri-tert-butylcyclopentadienyl)uranium Methylimide, Cp‘2UNMe, and Related Compounds

“…The formation of a metallocene imide from a metallocene bis(amide) is an important reaction since it is postulated to be a key step in the catalytic hydroamination of terminal acetylenes reported by Eisen. 10 The decamethylmetalloceneuranium fragment 11 is essential for the preparation of these monomeric f 2 -imido derivatives (with or without a coordinated Lewis base), since for example, imides derived from (η 5 -MeC 5 H 4 ) 2 U or [(Me 3 Si) 2 N] 2 U fragments yield dimeric derivatives, (η 5 -MeC 5 H 4 ) 4 U 2 (μ-NR) 2 12 or [(Me 3 Si) 2 N] 4 U 2 (μ-NR) 2 . 13 Thus, steric effects seem to play a dominant role in determining the degree of association of the uranium imide.…”