[{2,6‐(Me₂NCH₂)₂C₆H₃}Sn]₂: An Intramolecularly Coordinated Diorganodistannyne

Abstract

Not only steric protection by bulky substituents but also intramolecular N→Sn coordination makes possible the isolation and characterization of dimeric organotin(I) compounds such as [{2,6‐(Me2NCH2)2C6H3}Sn]2 (see structure), which according to a crystallographic study exhibits a SnSn bond length of 2.9712(12) Å.

[{2,6‐(Me2NCH2)2C6H3}Sn(μ‐OH)W(CO)5]2: A Transition‐Metal‐Coordinated Organotin(II) Hydroxide

“…Based on our findings that, in solution and with the evolution of hydrogen, [10] the hydrido-substituted organostannylene transition metal complexes [4-tBu-2,6-{(OR) 2 P-(O)} 2 C 6 H 2 Sn(H)M] [M = Cr(CO) 5 , W(CO) 5 , Fe(CO) 4 ; R = Et, iPr] undergo tin-tin bond formation to give the corresponding ditin compounds [4-tBu-2,6-{(OR) 2 P(O)} 2 -C 6 H 2 SnM] 2 , [9,11] we attempted the synthesis of the related complex [{2,6-(Me 2 NCH 2 ) 2 C 6 H 3 }SnW(CO) 5 ] 2 that contains (dimethylamino)methyl (Me 2 NCH 2 ) instead of the phosphonic ester (P(O)(OR) 2 [12]…”

Synthesis and characterization of novel intramolecularly O,C,O-coordinated heteroleptic organostannylenes and their tungstenpentacarbonyl complexes

“…Indeed, this concept was shown to be fruitful and the complexes R[(CO) 5 5 ]R (R = {2,6-[P(O)(Oi-Pr) 2 ] 2 -4-tertBu-C 6 H 2 }, M = Cr, W) were prepared via reduction of the organochlorostannylene complexes R(Cl)SnM(CO) 5 to give the corresponding hydrides R(H)SnM(CO) 5 followed by evolution of hydrogen, H 2 , and tin-tin bond formation [6]. The solid state structures of the ditin compounds mentioned above, as their thf and toluene solvates, respectively, are characterized by observation of different tin-tin distances ranging in between 2.8923(4) and 3.1433(7) Å, with the origin for these differences not being understood yet.…”

“…Only recently, we demonstrated that employment of intramolecularly coordinating built-in ligands such as o-C 6 H 4 CH 2 NMe 2 is an alternative for the stabilization of organotin(I) species (RSn) 2 [5].…”

Oxidative Addition of Diorgano Disulfides to Distannyne [{2,6‐(Me2NCH2)2C6H3}Sn]2

“…The starting compound 1 was prepared according to a literature procedure. [36] Synthesis of Compounds 2-4: A hexane solution of diorgano disulfide R 2 S 2 was added with stirring to a hexane solution of 1 at -60°C. The mixture was stirred for additional 0.5 h at this temperature, and the reaction mixture was then warmed to room temp.…”

“…We reported the synthesis of the organotin(I) compound {2,6-(Me 2 NCH 2 ) 2 C 6 H 3 }Sn-Sn{2,6-(Me 2 NCH 2 ) 2 C 6 H 3 } (1), the first heavy alkyne analogue stabilized by intramolecular NǞSn coordination (Figure 1). [36] Later, Roesky et al and So et al reported on the stabilization of other singlebonded distannyne(I) or digermyne(I) compounds (Figure 2) stabilized by related N,C,N-chelating ligands. [37] So et al also showed possible stabilization of a digermyne(I) by the unsymmetrical O,C,N-chelating ligand.…”