Mass spectrometry of π-complexes of transition metals XI. Manganese and rhenium vinylidene complexes

Use of the MnCC system in organometallic and organic synthesis

“…Cp(CO) 2 Mn C CHPh (1), [Cp(CO) 2 Mn] 2 (-C CHPh) (2) and Cp(CO) 2 Mn C CPhCPh C Mn(CO) 2 Cp (3), were the products of reaction (1) along with 2 -alkyne complexes Cp(CO) 2 Mn( 2 -PhC CR) (1a-c) [7,15,44,45].…”

“…Complex Cp(CO) 2 Mn C CPhCPh C Mn(CO) 2 Cp (3) was in fact the first representative of this type, but because of the absence of the X-ray data, it was published as Cp 2 Mn 2 (CO) 4 (C 16 H 10 ) [6,7,15] or [Cp(CO) 2 Mn] 2 (C 16 H 10 ) [44]. The spectroscopic data (Section 2.4.2) provided unambiguous interpretation of 3 as the bis-vinylidene complex.…”

“…organometallic analogs of organic allenes R 2 C C CR 2 . (1), Re (6)) causes consecutive elimination of the CO groups from the molecular ion [P] + and then a splitting of the M C and M-Cp bonds [44]. A very strong increase in the intensity of the [P-2CO] + ion in the mass spectrum of 6, compared to 1, is due to the greater Re C bond strength.…”

“…A very strong increase in the intensity of the [P-2CO] + ion in the mass spectrum of 6, compared to 1, is due to the greater Re C bond strength. The mass spectrum of 1 contains the [MnC 8 [44]. The existence of this four-carbon chain in molecule 8 was shown by XRD [16a].…”

“…A very intense dehydrogenation process under electron impact was observed while studying the mass spectra of Cp(CO) 2 Re C CHPh (6), [Cp(CO) 2 Re] 2 (-C CHPh) (7) and Cp(CO) 2 Re[ 2 -H 2 C CPhCPh C Re(CO) 2 Cp] (8) [44]. The elimination of hydrogen is likely to occur from both Cp and vinylidene ligands.…”