Synthesis of (4-methoxycarbonyl-1-naphthoyl)cyclopentadienyl M–Sn(IV) heterobimetallic complexes

Abstract

Reaction of cyclopentadienyl sodium with dimethyl 1,4-naphthalenedicarboxylate in a 1 : 1 or 2 : 1 ratio in THF yielded functionalized cyclopentadienyl anions CH3O2CC10H6C(O)Cp−, which reacted with M(CO)6 to give carbonyl metal anions CH3O2CC10H6C(O)CpM (M = Mo or W). Treatment of these carbonyl metal anions with R n SnX4−n (R = Ph or Me; X = Cl or Br; n = 2 or 3) yielded heterobimetallic complexes CH3O2CC10H6C(O)CpM(CO)3SnR n X3−n , which have been characterized by elemental analysis, NMR and IR spectroscopy. In addition, treatment of complexes CH3O2CC10H6C(O)CpM(CO)3SnPh3 with HCl resulted in cleavage of Sn–C bonds to give CH3O2CC10H6C(O)CpM(CO)3SnCl3 in good yield. The crystal structure of CH3O2CC10H6C(O)CpMo(CO)3SnCl3 was determined by X-ray diffraction, showing that Mo adopts a 3 : 4 piano stool structure; this complex is linked into a two-dimensional network through weak intermolecular C–H ··· O and Cl ··· Cl interactions.