Iron complexes carbyne

Photolysis of 2-substituted cyclopropyl carbyne complexes afforded 4-substituted cyclopentenones (equation 115). Irradiation of the diastereomeric mixture of either cis- or /ra j,-2,3-dimethylcyclopropyl carbyne complexes gave selectively the irons-3,4-dimethylcyclopentenone, indicating a rapid cyclopropane photoisomerization prior to photooxidation (equation 116). The cis configuration is, however, retained in fused ring systems. Thus photooxidation of bicyclo[4.1.0]hept-7-yl carbyne complex results in... 

In the multipole refinement of TPPFe(THF)2, a D4h local symmetry was imposed on the iron atom which explains that only four dt population parameters were derived inspection of Table 4 leads to the same conclusion derived qualitatively from the examination of the deformation maps i.e., the 5 2g state is the main contributor to the ground state of the complex. This interesting calculation of d electron population calculations was also performed on other coordination compounds like metal carbonyls [38] and metal carbynes [39]. 

Complexes Containing Metal-Carbon cr-Bonds of the Groups Iron, Cobalt, and Nickel, Including Carbenes and Carbynes... 

Iron carbonyls Fe2(CO)9 and Fe(CO)5 cleave the C —Br bond of tribromofluoro-methane to give the following carbyne complex. 

Dinuclear iron-carbyne complexes, with the general structure (26), have been prepared from Li[Fe(CO)2Cp] and epoxides (R = cyclopentene or exo-nothor-nene) or [Fe(CO)2(CH2Ph)Cp] (R = benzyl). Protonation of the product of the reaction between [ Fe(CO)2Cp>2] and LiR gives similar products (R = Me, Bu , or Ph). "... 

The running order in this chapter is essentially similar to that used in the preceding one. The main section, dealing with metal-carbon Group VIII triads in the order, iron, cobalt, and nickel, and is followed by a shorter section on carbene and carbyne complexes. Oxidative addition or reductive elimination reactions are included only when they lead directly to the formation or rupture of metal-carbon bonds. 

The general format of this chapter is very similar to that used in previous years. The review is restricted to detectable complexes of the iron, cobalt, and nickel triads which contain a metal-carbon o-bond, including carbenes and carbynes. Species postulated in catalytic cycles have normally been excluded and coverage of metal cluster complexes has been kept to a minimum. 

OsCl2(CO)(CTe)(PPh3)2]. The cationic osmium carbyne complex, [Os(CR)-(CO)a(PPh3)2]+ (R=p-tolyl), reacts with LijBtsBH] to form the unusual vinylidene complex (34). Iron, ruthenium, and osmium carbene complexes are also discussed in Section 2 (refs. 8, 34, and 38). 

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