The synthesis of tetrakis(trifluoromethyl)lead

The Valence States of Copernicium and Flerovium

“…[22] Experimentally, all four PbX 4 derivatives are known compounds and have been studied in detail under relatively ordinary conditions. [23] The flerovium case is dramatically different. Large negative (free) energy changes are associated with decomposition of the tetravalent Fl compounds.…”

“…The instability in the latter two cases of course reflects in part the great strength of the C–C bonds in products, ethane and hexafluoroethane . Experimentally, all four PbX 4 derivatives are known compounds and have been studied in detail under relatively ordinary conditions …”

Lead

“…68 ESR spectra of the radical cation Me 4 Pb + generated by y-irradiation o f tetramethyllead in trichlorofluoromethane indicate a trigonal-pyramidal structure (19) in which the singly occupied molecular orbital is largely localized in the dashed vertical lead-carbon bond. 68 ESR spectra of the radical cation Me 4 Pb + generated by y-irradiation o f tetramethyllead in trichlorofluoromethane indicate a trigonal-pyramidal structure (19) in which the singly occupied molecular orbital is largely localized in the dashed vertical lead-carbon bond.…”

Highly Trifluoromethylated Platinum Compounds

“…This difference is especially patent in compounds with a high alkyl-group content. Thus, interesting derivatives with up to eight methyl groups per central atom are known, such as different salts of the octamethyluranate(V) [2] [UA C H T U N G T R E N N U N G (CH 3 ) 8 ] 3À , octamethyltungstate(VI) [3] [WA C H T U N G T R E N N U N G (CH 3 ) 8 ] 2À , or the octamethylrhenate(VI) [4] [Re-A C H T U N G T R E N N U N G (CH 3 ) 8 ] 2À anions. In contrast, organoelement derivatives with up to just four CF 3 groups have been isolated and characterized.…”

“…This type of compounds includes perfluoroneopentane CA C H T U N G T R E N N U N G (CF 3 ) 4 , which was first obtained as one of the many components in the pyrolysis at around 500 8C of CF 3 SF 5 or (CF 3 ) 2 SF 4 with CF 3 CF=CF 2 . [5] This fluorocarbon molecule as well as other homoleptic neutral species of formula EA C H T U N G T R E N N U N G (CF 3 ) 4 (E = Ge, Sn, Pb, and Te) have been subsequently obtained by at least one of the following procedures (Scheme 1): [6] 1) direct fluorination of the corresponding E-A C H T U N G T R E N N U N G (CH 3 ) 4 derivatives (Scheme 1a); [7] 2) reaction of the suitable element precursor with plasma-generated CF 3 C radicals obtained from homolytic cleavage of the CF 3 À CF 3 bond by glow discharge (Scheme 1b); [8] and 3) by exchange reaction between a neutral halide EX 4 4 (Scheme 1c). [9] The anionic species [BA C H T U N G T R E N N U N G (CF 3 (6) is thermally stable and has a n CO of 2194 cm…”