We report the synthesis of O- and N-chelated
hexacoordinated molybdenum imido alkylidene N-heterocyclic
carbene (NHC) bistriflate and pentacoordinated molybdenum
imido alkylidene NHC monotriflate monoalkoxide complexes and
their use as thermally latent and in some cases air-stable
precatalysts in the ring-opening metathesis polymerization
(ROMP) of dicyclopentadiene (DCPD). Introduction of electron-
withdrawing and electron-donating groups at the O-chelated
alkylidene ligand allowed for the tuning of both the onset
temperature of polymerization (Tonset) and the temperature of the
exotherm maximum (Texo,max). In addition, N-chelated complexes
were synthesized using easily available 2-vinylpyridine or 2-vinyl-
N,N-dimethylaniline to yield five-membered and, for the first time,
four-membered molybdenum imido alkylidene NHC chelates.
With these precatalysts, Tonset and Texo,max could be varied between
52 and 142 °C and between 99 and 174 °C, respectively. All primary data files and processed data of the journal article from the Buchmeiser group. Tuning the Latent Behavior of Molybdenum Imido Alkylidene N-Heterocyclic Carbene Complexes in Dicyclopentadiene Polymerization. Nuclear magnetic resonance (NMR) spectra are uploaded. Also differential scanning calorimetry (DSC) data are available.
