Die Molekül‐ und Kristallstruktur von 3,3‐Bis(methoxycarbonyI)4‐phenyl‐1‐pyrazolin‐N‐(tetracarbonyleisen)

Abstract

Die Rontgenstrukturanalyse dcr Titclverbindung (Zelldaten: u : : 10.113 (2), h 27.548 (7), c 6.938 (2) A, /3 = 99.53 (2)', P2l/c, Z = 4) bewcist die cr-Komplexbildung zwischen einem 1 -Pyrazolin-Derivat uitd eineni Ubergangsmetall. Dcr Ligand ist iiberraschenderweise in apikaler Position an einen trigondl-bipyramidalen Fe(C0)4-Resl gebunden. Die Ceometrie des Liganden andert sich durch die Komplexierung nicht wesentlich. The Molecular und Crystal Structure of 3,3-Bis(methoxycarbonyl)-4-phenyl-l-p~~razo1ine-~-(te~acarbony1iron)The single crystal x-ray analysis of the title compound (cell data: u ~ 10.113 (2), b = 27.548(7). c = 6.938 (2) A, p = 99.53 (2)", P21/c, Z : 4) shows the I-pyrazoline derivative to be linked through a a-bond to the apical position of a Fe(C0)4 residue. The geometry or the ligand is not altered upon complexation.

Transition Metal Complexes of Diazenes, XVII [1]. Reactions of 1,2-Diazetines and 1,2-Diazetine-N-oxides with Iron Carbonyls

“…On the basis of the striking similarity of the IR spectrum with that of (2,3-diazanorbornene)Fe(CO)4 [5] and its smooth conversion into 4 and 5 upon reaction with Fe2(CO)9, we propose that 1 is bonded via one lone pair to the Fe(CO)4 unit as shown in Scheme 1. Complex 3 is less stable than analogous complexes of this type containing diazenes of larger ring size [2,13]. Scheme 2.…”