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- W2023165632 abstract "Treatment of [M(CO)3(η-C5Me5)]–(M = Mo or W) with Br[CH2]3 Br gives the metallapropanes [M{(CH2)3Br}(CO)3(η-C5Me5)]. Reaction of [Mo{(CH2)3Br}(CO)3(η-C5Me5)] with I– provides cis and trans carbenes [MoI(CO)2{[graphic omitted]}(η-C5Me5)]. Crystallisation of the mixture gives two crystal forms, one of which consists of pure trans isomer while the second consists of a mixture of predominantly two cis components (68.5 and 7.1%) with some trans isomer (24.4%) incorporated in the crystal. For the trans isomer, orthorhombic, a= 15.38(6), b= 15.65(8), c= 14.78(6)Å, R 0.0665 for 1 335 independent reflections. For the cis isomer, monoclinic, a= 12.73(4), b= 9.26(3), c= 16.09(4)Å, β= 108.68(9)°, R 0.0908 for 974 independent reflections. In tetrahydrofuran solution the two isomers slowly interconvert at ambient temperature. The reaction of Br– with [Mo{(CH2)3Br}(CO)3(η-C5Me5)] gives the carbene [MoBr(CO)2{[graphic omitted]}(η-C5Me5)] as predominantly the cis isomer. The reaction of CN– with [Mo{(CH2)3Br}(CO)3(η-C5Me5)] gives the trans carbene [Mo(CN)(CO)2{[graphic omitted]}(η-C5Me5)] while reaction with SCN– gives the cis carbene [Mo(NCS)(CO)2{[graphic omitted]}(η-C5Me5)]. Reaction of [W{(CH2)3Br}(CO)3(η-C5Me5)] with I– affords the iodo carbene [WI(CO)2{[graphic omitted]}(η-C5Me5)] as predominantly the trans isomer. Reaction of [Mo{(CH2)3Br}(CO)(η-C5Me5)] with [Fe(CO)2(η-C5H5)]– results in elimination of Br– and formation of the heterodimetalla-alkane species [(η-C5Me)(OC)3Mo(CH2)3Fe(CO)(η-C5H5)]." @default.
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- W2023165632 title "Pentamethylcyclopentadienyl molybdenum and tungsten carbene complexes. X-Ray crystal structures of cis- and trans-[Mol(CO)<sub>2</sub>{C(CH<sub>2</sub>)<sub>3</sub>O}(η-C<sub>5</sub>Me<sub>5</sub>)]" @default.
- W2023165632 doi "https://doi.org/10.1039/dt9880001449" @default.
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