Synthesis and crystal structure of the silver(I) alkyl species, [{2-(Me3Si)2C(Ag)C5H4N}2], a dimeric compound void of electron-deficient bonding
作者:Rocco I. Papasergio、Colin L. Raston、Allan H. White
DOI:10.1039/c39840000612
日期:——
The silver (I) alkyl complex [2-(Me3Si)2C(Ag)C5H4N}2], prepared by the reaction of the analogous lithium alkyl with AgBF4 in tetrahydrofuran, is a binuclear complex in which the metal ion is not involved in electron-deficientbonding, being bound by a carbon atom at 2.154(5)Å and a nitrogen atom of a centrosymmetrically related ligand at 2.160(5)Å; the Ag ⋯ Ag′ separation is 2.654 (1)Å.
Novel monoanionic di-N,N′-centred chelating ligands and their C1 and C2 symmetrical zirconium complexes
作者:Berth-Jan Deelman、Peter B Hitchcock、Michael F Lappert、Hung-Kay Lee、Wing-Por Leung
DOI:10.1016/0022-328x(95)06108-9
日期:1996.5
The novel lithium complexes [LiN(SiMe(3))C(Ph)C(R)(C5H4N-2)}](2) (R = H or SiMe(3)) and LiN(SiMe(3))C(Ph)C(R)(C9H6N-2)} (R = H or SiMe(3)), prepared from PhCN and [LiC(SiMe(3))(R)(C5H4N-2)}](2) or LiC(SiMe(3))(R)(C9H6N-2)}, react with ZrCl4 to afford racemic complexes [ZrN(SiMe(3))C(Ph)C(R)(C5H4N-2)}Cl-2(2)] (R = H or SiMe(3), 3b) and [ZrN(SiMe(3))C(Ph)C(R)(C9H4N-2)}Cl-2(2)], respectively. Conproportionation of ZrCl4 and 3b or 4b afforded [ZrN(SiMe(3))C(Ph)C(SiMe(3))(C5H4N-2)}Cl-3] and [ZrN(SiMe(3))C(Ph)C(SiMe(3))(C9H6N-2)}Cl-3], respectively. The compounds are characterised by NMR spectroscopy and X-ray data are provided for 3b.
Synthesis of pyridine functionalised, sterically hindered lithium and copper (I) alkyls; crystal structures of [{2-(Me3Si)2C(M)C5H4N}2](M = Li or Cu), dimeric compounds free of multicentre bonding
作者:Rocco I. Papasergio、Colin L. Raston、Allan H. White
DOI:10.1039/c39830001419
日期:——
methylpyridine, (1), with LiBun in hexane–diethyl ether, and LiBun in tetrahydrofuran followed by CuCl, yields thermally robust binuclear complexes [2-(Me3Si)C2(M)C5H4N}2] for M = Li and M = Cu respectively in which the metal is not involved in electron deficient bonding, being bound by Cα of one ligand and the nitrogen of a centrosymmetrically related ligand and has a close metal contact [M ⋯ M 2.560(9)(Li)
Alkylation of (As, Sb, Bi)Cl<sub>3</sub>: formation of [(As, Sb, Bi)RCl<sub>2</sub>], (E)-[BiR(CH<sub>2</sub>CHC)(SiMe<sub>3</sub>)(C<sub>5</sub>H<sub>4</sub>N-2)] and 2-CH(SiMe<sub>3</sub>)<sub>2</sub>C<sub>5</sub>H<sub>4</sub>N-5-R [R = C(SiMe<sub>3</sub>)<sub>2</sub>C<sub>5</sub>H<sub>4</sub>N-2]
作者:Cameron Jones、Lutz M. Engelhardt、Peter C. Junk、David S. Hutchings、Wyona C. Patalinghug、Colin L. Raston、Allan H. White
DOI:10.1039/c39910001560
日期:——
Monomeric alkyldichloro-antimony(III) and –bismuth(III) compounds [MRCl2], R = C(SiMe3)2C5H4N-2′, and the thermally unstable arsenic(III) analogue are accessible from the appropriate group 15 trichloride and LiR in diethyl ether; treating BiCl3 with two and three equivalents of LiR in tetrahydrofuran (THF) yields (E)-[BiR(CH2CHC)(SiMe3)(C5H4N-2)] where the C2 insertion–SiMe3 elimination fragment originates from THF, and the ‘head-to-tail’ alkyl coupled species, 2-CH(SiMe3)2C5H4N-5-R.