Multinuclear NMR Characterization of Co-cross-linking of Ethylene-co-vinylacetate and Ethylene-co-methylacrylate Polymer Blends in the Presence of Dibutyltin Oxide

Ester interchange reactions catalyzed by tin compounds in reactive processing: NMR contribution via reactions with model compounds

“…These ligand exchanges evidenced by Espinasse et al [8] by NMR spectroscopy (Fig. 3) accounted for the random distribution of the four esters obtained and the random distribution of the alkoxy and acyloxy ligands at the exo and endo tin sites, respectively.…”

ESIMS and NMR studies on the selective deprotection of acetylated glucosides by dibutyltin oxide

“…13,14 The 119 Sn NMR spectrum for sample 2 exhibits three peaks in the field (À150, À175 ppm), and the expected sites are Bu 2 Sn[O] 3 , Bu 2 Sn[O] 2 OH, and Bu 2 Sn[O] 2 OR corresponding to the unachieved hydrolysis and/or condensation reactions, while the two peaks at higher field (À175, À200 ppm) are assigned to Bu 2 SnO(OR)(OAc or OR) according to the literature. 15 Bu 2 Sn[O] 2 (OAc) is precluded since no resonance is found in the field (À200, À240 ppm). The 119 Sn NMR spectra for 2 consist of more than 91% pentacoordinated sites in the field (À150, À200 ppm) and 9% hexacoordinated sites in the field (À300, À400 ppm).…”

Morphology monitoring of PE/PBT blends by reactive processing

“…In previous studies, 13,14 we showed that DBTO reacts with ester groups to form distannoxane structures, the true catalyst of the transesterification reaction. Therefore, during the synthesis of EVAh, DBTO reacts with ester groups of EVA to form distannoxane structures.…”

“…Recently, our work has shown that dibutyltin oxide (DBTO) reacts with ester groups to form alkoxy-acyloxy distannoxanes. [13][14][15] These compounds are good catalysts for transesterification reactions.…”