Synthesis of C,Sn-chiral triorganotin halides via C-chiral arylcopper and arylgoldlithium intermediates. Crystal and molecular structure of one [2-[1-(S)-(dimethylamino)ethyl]phenyl]methylphenyltin bromide diastereomer

Abstract

Abstract:The crystal and molecular structure and absolute configuration of 2-[ l-(S)-Me2NCH(Me)]C6H4SfnMePhBr, which is the first example of a diastereomerically pure chiral triorganotin halide, are determined by a single-crystal x-ray diffraction study. Crystals are orthorhombic, space group P212121 with Z = 4 in a unit cell of dimensions n = 9.370 (4), b = 13.361 (3), and c = 14.283 (4) A. The final R value is 0.048 for 2784 reflections. The tin atom has a distorted trigonal bipyramidal geometry with the C,N-bonded Me2NCH(Me)C6H4 group spanning one equatorial (C) and one axial (N) site. The Ph and M e groups reside in the two equatorial positions resulting in an (S)sn configuration at the tin atom (cf. Figure 1). The configuration at Sn was unambiguously determined by using anomalous diffraction effects which likewise resulted in an independent check of the configuration at the CY-C atom (S configuration). The

Structural Diversity of Coordination Cores in Homoleptic Tetraaryltin(IV) Dioxolane, Aldehyde and Imines: The First Octacoordinated Double Helicate Tetraorganotin(IV) Compound

“…Compound 2 is the first example of a mononuclear tetraorganotin(IV) compound that contains an octacoordinated metal centre with a double helicate topology in the solid state. Multinuclear NMR spectroscopy studies in solutions of CDCl 3 are consistent with equivalent organic groups attached to a tetracoordinate tin atom.…”

“…For (imino)aryl species 3 and 5, the molecular ions were not observed in the APCI+ mass spectra, but the base peaks were [R 3 Sn] + fragments, as was for 2 in the ESI+ spectrum. Their molecular structures were determined by single-crystal X-ray diffraction.…”

“…[1] There are few other reports on organotin species containing other related monoanionic ligands with an sp 3 -nitrogen atom in the pendant arm, that is, 2-(Et 2 NCH 2 )C 6 H 4 [2] or 2-[Me 2 NCH-(R)]C 6 H 4 (R = Me, [3] tBu [4] ). Notably, the 2,6-(Me 2 -NCH 2 ) 2 C 6 H 3 group, which usually acts as a "pincer" N,C,N ligand, [5] can also act as a C,N ligand if the nitrogen atom of one pendant arm is protonated or if crowding around the metal prevents coordination of both nitrogen atoms to the tin atom.…”

Zinc(II) and cadmium(II) compounds with the 2-[(dimethylamino)methyl]phenyl ligand

“…coordination in LM compounds (19). The L2M complexes (L = Zn, Cd) may occur as 2-, 3-, or 4-coordinate species.…”

Synthesis, Spectral and Antimicrobial Studies of Some d10 Metal-Ions Ditellura Tetraazamacrocyclic Complexes

“…Coordination behavior of organometallic compounds containing bidentate ligands has been the subject of substantial studies in recent years [17][18][19] .…”