Abstract
We report on the ESI-TOF MS investigation of oligomerization and co-oligomerization reactions via ring-opening metathesis polymerization of noncharged monomers. Thus, the monomers 1–4 ((±)endo,exo-bicyclo[2,2,1]hept-5-ene-2,3-dicarboxylic acid-bis-O-methyl ester (1), exo-N-(4,4,5,5,6,6,7,7,7-nonafluoroheptyl)-10-oxa-4-azatricyclodec-8-ene-3,5-dione (2), 3-methyl-3-phenylcyclopropene (3), and (±)endo,exo-bicyclo[2,2,1]hept-5-ene-2,3-dicarboxylic acid-bis-O-2,2,6,6-tetramethylpiperidinoxyl ester (4)) were investigated with the catalysts 5–8 (Grubbs catalyst first generation (5), Grubbs catalyst third generation (6), Umicore M1 (7), and Umicore M3 (8)) with respect to their crossover chemistries. Monomers 1–4 differ in ring size and substitution patterns and allow to study the monomer reactivities in the order of increasing reactivity for monomer 3 < 4 ≈ 1 < 2. The measured spectra display a significant difference between the reactions conducted with first- and third-generation catalysts with the main fracti...
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