Evidence for trifluoromethyltin(II) compounds

Synthesis and Reactivity of Donor‐Stabilized Bis(pentafluoroethyl)stannylene [Sn(C2F5)2(D)n] (D=THF, DMAP, PMe3, [Sn(C2F5)3]−)

“…The removal of all volatile Scheme2.Synthesis of H 2 Sn(C 2 F 5 ) 2 . Thermalellipsoids are shown at 50 %p robability; hydrogena toms were refined isotropically;s elected bondlengths [pm] and angles [8]: Sn1-C3 221.0(5), Sn1-C12 21.5(5), Sn1-H1A163(6), Sn1-H1B 170 (6),C 3-Sn1-C1 103.0(2).…”

“…Figure 2. Molecular structure of cis,cis-(PhC 2 H 2 ) 2 Sn(C 2 F 5 ) 2 :T hermale llipsoids are shownat5 0% probability;h ydrogen atomsw ere removedf or clarity; just one conformer is shown;selectedbondlengths [pm] and angles [8]: Sn1ÀC1 211.4(3), Sn1ÀC9 211.9(3), Sn1ÀC17 223.0(3), Sn1ÀC19 223.6(3);C1-Sn1-C9122.9(1), C1-Sn1-C17 113.8(1), C1-Sn1-C19103.2(1),C 9-Sn1-C17 102.9(1), C9-Sn1-C191 12.8(1), C17-Sn1-C19 98.9 (1). compounds in vacuo yields ar ed oil, whichg ives rise to a yellow solution in n-pentane.T he 1 HNMR spectrum reveals resonances of coordinated THF at d = 2.5 and 4.6 ppm, which are considerably shifted to lower field in contrast to free THF.…”

“…The coordination of the lone pair of the stannylene to the nickel leads to aw idening of the C-Sn-C angle from 89.5(1) to 6 .Thermal ellipsoids are shownat 50 %p robability.Selectedb ond lengths [pm] and angles [8]: Sn1ÀSn2: 280.4(1), Sn2ÀSn3:2 80.5(1), Sn1-Sn2-Sn3:1 13.9(1).…”

“…(2)( right). Thermal ellipsoidsare shown at 50 %probability;hydrogen atoms werer emoved for clarity;selectedb ond lengths [pm] and angles [8]: [Sn(C 2 F 5 ) 2 (dmap) 2 ]: Sn1ÀC1:2 31.4(2), Sn1ÀC3:231.9(2), Sn1ÀN3:2 45.0(2), Sn1ÀN1:255.7(2), C1-Sn1-C3:89.5(1), N3-Sn1-N1:167.4 (1); [Ni(CO) 3 {Sn(C 2 F 5 ) 2 (dmap) 2 }]: Sn1ÀC3:2 27.2(2),Sn1ÀC1:227.6(2), Sn1ÀN3: 245.1(1), Sn1ÀN1:247.2(1), Sn1ÀNi1:2 51.6(1), C3-Sn1-C1:1 02.0(1), N3-Sn1-N1:164.7 (1).…”

“…[7] Although these observations indicate ap ossible stabilization of stannylenes by electron-withdrawing groups, only one successful preparation of such ap erfluoroalkyl stannylene was reported so far. [8] The treatment of H 2 Sn(CF 3 ) 2 with PMe 3 afforded the spectroscopically identified [Sn(CF 3 ) 2 (PMe 3 )] in addition to the generation of H 2 .U nfortunately,t rifluoromethyltin hydrides are unstable at room temperature. In general the SnÀHb ond is stabilized by electronrich alkyl groups.…”