117526-22-4Relevant academic research and scientific papers
Reactive π-complexes of the electron-rich transition metals. 3. (η4-Methylnaphthalene)iron(0) complexes. X-ray crystal structure of (5-8-η-1,4-dimethylnaphthalene)tris(trimethyl phosphite)iron
Sch?ufele, Hartmut,Hu, Donggi,Pritzkow, Hans,Zenneck, Ulrich
, p. 396 - 401 (2008/10/08)
Bis(toluene)iron (1) reacts at about -50°C with 1-methylnaphthalene to form (η4-1-methylnaphthalene)(η6-toluene)iron (2). Compound 2 consists of a mixture of two isomers, in which the metal is bound either to the unsubstituted (2a) or to the substituted ring (2b) of the naphthalene derivative. A three-component reaction of iron vapor, p-xylene, and 1,4-dimethylnaphthalene yields (5-8-η-1,4-dimethylnaphthalene)(η6-p-xylene)iron (4a), (1-4-η-1,4-dimethylnaphthalene)(η6-p-xylene)iron (4b), and an uncharacterized product, 5. Compounds 2a and 4a are the favored isomers. Substitution reactions of 2 and 4 with phosphites allow the synthesis of new or known complexes of the type (η6-arene)FeL2 in good yields (arene = toluene or p-xylene) below room temperature. Compound 5 and trimethyl phosphite or Fe vapor/1,4-dimethylnaphthalene/triethyl phosphite form (5-8-η-1,4-dimethylnaphthalene)Fe[P(OR)3]3 [R = Me (7a), Et (7b)]. An X-ray determination of the molecular structure of 7a proves the η4-bondmg mode of the 1,4-dimethylnaphthalene ligand which is bent 41° along C5-C8 away from the metal. The two halves of the 1,4-dimethylnaphthalene are planar. 1H and 13C NMR studies on the series of compounds described in this paper give clear evidence for the (η4-methylnaphthalene)Fe units in all cases.
