Manganese and rhenium dihydrobis(pyrazolylato)borate-complexes

Abstract

M an ga nese and R hen i u m D i hydro b is ( pyrazo I y I ato ) borateco m pl exes

Technetium and Rhenium

“…269 The related complex [Re{N(SO 2 F) 2 j(CO) 5 (46). 273 Reaction of this complex with EtC(CH2O)3P leads to displacement of both the pyrazole group and the carbonyl trans to it.…”

Rhenium(V) Dioxo Complexes with Dihydrobis(pyrazolyl)borates: Synthesis and Reactivity toward Electrophilic Substrates

“…To the best of our knowledge, [Re{H 2 B(pz) 2 }(CO) 3 -(L)] (L ) pzH, MeC(CH 2 O) 3 P) are the only examples of complexes with this type of ligand. 26 One of the reasons for the lack of results is the relative fragility of dihydrobis-(pyrazolyl)borates when they react with different oxorhenium starting materials, such as ReOCl 4 -, Re 2 O 7 , or ReOCl 3 (PPh 3 ) 2 . In our hands, reactions of these starting materials with dihydrobis(pyrazolyl)borates did not allow the preparation of oxo complexes and total or partial modification of the ligands occurred.…”

Coordination chemistry of pyrazole-derived ligands

“…Thus, the reaction of pyrazole with C5H5C0I2CO results in the displacement of CO and the formation of C6H5CoI2(Hpz) as an air-stable green solid.37 Simple coordination by pyrazole to relieve coordinative unsaturation has been reported for Et2B(pz)2Mo(CO)2-ir-allyl38'39 and for compounds such as H2B(pz)2Mn(CO)3. 40 In each of these instances the addition of pyrazole gives rise to an inert gas configuration. Heating of the complex H2B(pz)2Mn(CO)3-(Hpz) converts it to HB(pz)3Mn(CO)3.…”

“…Heating of the complex H2B(pz)2Mn(CO)3-(Hpz) converts it to HB(pz)3Mn(CO)3. 40 The reaction of Fe(CO)s with 3,5-dimethylpyrazole is re-ported41 to give the air-sensitive (H3,5-Me2pz)2FeCO as a pink solid. A -bonded sandwich structure has been tentatively proposed for this compound; this, however, seems unlikely.…”