Cis, isotactic selective ROMP of norbornenes fused with N-arylpyrrolidines. double stranded polynorbornene-based ladderphanes with Z-double bonds
Journal
Macromolecules
Journal Volume
45
Journal Issue
20
Pages
8166-8171
Date Issued
2012
Author(s)
Zhu, L.
Flook, M.M.
Lee, S.-L.
Chan, L.-W.
Huang, S.-L.
Chen, C.-H.
Schrock, R.R.
Luh, T.-Y.
Abstract
Upon treatment with a molybdenum-carbene with bidentate substituted biaryl-o,o′-diphenoxide ligand 12, norbornene fused with N-aryl-endo-pyrrolidine 9a undergoes ROMP to give exclusively polynorbornene with cis, isotactic-selectivity. Bis(norbornenes) connected with ferrocene 18 or benzene 20 linkers yield the corresponding double-stranded ladderphanes 19 and 21, respectively with isotactic stereochemistry having all double bonds in Z-configuration. Like the corresponding ladderphanes with E-double bonds, ladderphane 19 also assembles on HOPG to give a highly ordered two-dimensional array as revealed by STM images.
Type
journal article