The influence of an acetyl group on the cyclopentadienyl ring in the formation of Sn-Mo(W) complexes by nucleophilic displacement reactions, crystal and molecular structure of CH3COC5H4(CO)3MoSnPh2Cl

Thermochemical Considerations of Metal Enolates

“…The corresponding deacetylated [CpM(CO) 3 ] 2 SnPh 2 species are well-established 217 . While the lack of formation of these alternative products was ascribed in the literature 216 to the electron-withdrawing power of the acetyl group, steric hindrance might also play a role. Bond length is often related to bond order, and hence is assumed to relate to bond strength.…”

“…Earlier acetylcyclopentadienide species were referred to as enolates. We now note that AcC 5 H 4 W(CO) 3 − (and the related W complex) reacts with diphenyltin dihalides (Cl, Br) to form the monosubstituted derivatives, AcC 5 H 4 M(CO) 3 SnPh 2 X (M = Mo, W; X = Cl, Br), without any accompanying formation of either O-acetyl or ring-stannylated or trinuclear products 216 [AcC 5 H 4 M(CO) 3 ] 2 SnPh 2 . The corresponding deacetylated [CpM(CO) 3 ] 2 SnPh 2 species are well-established 217 .…”

Novel N-bridging cyclopentadienyl heteropolynuclear organometallamacrocycles with M–Sn (M = Mo or W) bonds

“…The Mo(1)-Sn(1) and Mo(2A)-Sn(2) bond distances are 2.857(1) Å and 2.860(1) Å , respectively, similar with that in the 14-membered terephthaloyl bridging cyclopentadienyl complex {p-[(CO) 3 (1) Å ) [7a]), and longer than those in non-cyclic or small metallacyclic cyclopentadienyl complexes (such as in CH 3 COC 5 H 4 Mo(CO) 3 SnPh 2 Cl (2.7683(6) Å ) [10] and l-[C 5 H 4 (CH 3 )C@NAN@C(S)C 4 H 3 S]Mo(CO) 3 SnCl 2 (2.7300(7) Å ) [11]). The C(1)-C(5) cyclopentadienyl plane and the C(10)-C(14) cyclopentadienyl plane, with the dihedral angle of 98.2°, are closely perpendicular to each other.…”