Mercuration of cyclobutadienyliron tricarbonyl

Radial (tetracyclopentadienyl)cyclobutadiene pentametals

“…We sought to provide a complementary route in which cyclopentadienyl substituents would be introduced into an already existing perhalogenated cyclobutadiene core through an extension of the successful methodology that led to derivatives of C [4,13] and D [5]. The only known such starting material was (tetraiodocyclobutadiene)iron(tricarbonyl) (1) [14], and it was consequently chosen as the substrate for our investigations. This substance had already been used successfully by Bunz in fourfold Sonogashira couplings [15].…”

(Cyclobutadiene)iron TricarbonylA Case of Theory before Experiment

“…The mercuration of (C 4 H 4 )Fe(CO) 3 is a very facile reaction. A 30 min reaction with an equimolar quantity of mercuric acetate in acetic acid gave a mixture in 5.5:2.0:0.5:1:1 molar ratio of the mono-, 1,2-di-, 1,3-di-, tri-, and tetraacetoxymercury derivatives, respectively …”

Cyclobutadienemetal complexes

“…This interesting reaction also afforded a mixture of all the possible acetoxymercury derivatives. 225 For instance, treatment of equimolar quantities of Hg(OAc)2 and 3 in acetic acid for 30 min at ambient temperature gave an equilibrium mixture consisting peracetoxymercury 283 on standing in acetic acid for about 30 min. The conversion of the monoacetoxymercury 279 to the chloromercury derivative 237 and iodo derivative 256 on treatment with NaCI and Kl3, respectively, has already been cited earlier.…”