Synthesis of benzoyl derivatives of Mo and W cyclopentadienyl tricarbonyls

Syntheses and structures of molybdenum and tungsten pentabenzylcyclopentadienyl complexes: new chlorination reactions

“…The reactions of 2a and 2b with PCl 5 led to high yield syntheses of a g 2 -acyl molybdenum complex [Mo-(CpBz)(g 2 -COCH 3 [8,9], alkyl migrations to CO have not been observed in [MoCp 0 (CO) 3 3 ] À with alkylating reagents [13,14]. The different behaviours shown by CpMo and TpMo based complexes have been reasoned on both stereochemical and electronic arguments [13].…”

“…To better characterize the relative conformation of the phenyl rings we present in Table 1 the torsion angles of the pending benzyl arms defined as M-C(CpBz ring)-C(CH 2 bridge)-C ipso . In all compounds the phenyl rings bending towards the metals define torsion angles of 10-11°, while the others present Table 1 Relevant bond distances and angles as well as torsion angles for compounds 2a, 2b and 5 (8) Cl (1) 7) 130.6(8) 131.2 (7) 129.9(9) CT-M-C (8) 115.9 (8) 117.3 (7) 115.1(9) CT-M-C (9) 123.8 (8) 129.1 (7) 123.2(9)…”

“…Yet, the long Mo-Cl distance found in 5 is surprising and, since it is not accompanied by other unusual features in the structure, it may reflect the disorder in the basal ligands. The CO ligand trans to the Mo-Cl bond in 5 displays a slightly different geometry with a longer M-C distance (Mo(1)-C(8), 2.047 (8) A) and a shorter CBO distance, 0.995 (8) A (See Table 1). Table 2 presents relevant bond distances and angles for complexes 3 and 4.…”