Phosphine complexes of main group elements: crystal structure of {Li[C(PMe₂)₃]-(tetrahydrofuran)}₂

Kinetically Controlled Protonation of a Cyclic Phosphamethanide Complex to a PH-Phosphonium Ylide

“…The coordination of the lithium by the phosphorus and nitrogen atoms can be described in terms of a strongly distorded tetrahedral, “seesaw”‐like geometry (P‐Li‐P 171°; N‐Li‐N 85°). The trigonal‐planar coordination of the carbon atoms (sum of bond angles 360°) and the PC distances (175.3(3), 175.5(3) pm) in the phosphoniomethanide moieties match the data of similar compounds 11…”

[Ph2P(NSiMe3)]2CLi2: A Dilithium Dianionic Methanide Salt with an Unusual Li4C2 Cluster Structure

“…Surprisingly, however, these phosphorus ± lithium distances fall within the range of a PÀLi single bond (2.64 ± 2.69 ) and are comparable with those reported for [LiCH(PPh 2 ) 2 ] and related compounds. [8,25,26] The PN bond lengths in 2 (av 1.621(4) ) are slightly elongated relative to those found in CH 3 CH{Ph 2 P N(Tol)} 2 [27] and H 2 C(Cy 2 P NSiMe 3 ) 2 .…”

Syntheses and Structures of Potassium Complexes Containing Bis(diphenylphosphanyl)methanide Anions

“…However, in the case of lithium, the absence of an excess of appropriate neutral donor ligands such as tetrahydrofuran (THF) leads to occupation of vacant coordination sites by the methanide carbon atom, as observed for instance in dinuclear [(thf)Li{(Ph 2 P) 2 CH}] 2 and related complexes. [15][16][17][25][26][27] Little is known about related potassium complexes although their synthetic potential was already underlined by successful employment in ligand transfer reactions for instance to lanthanum. [11,13] Izod et al were able to structurally characterize the polymeric deriva-interaction between potassium and the diphosphanylmethanide anion and lead to the mononuclear complexes [K{(Ph 2 P) 2 CH}(diglyme) 2 ] (5) and [{K{(Ph 2 P) 2 CH}(18C6)}-{K{(Ph 2 P) 2 CH}(18C6)(thf)}] (6), respectively.…”