Beilstein J. Org. Chem.2019,15, 44–51, doi:10.3762/bjoc.15.4
contains both cyclobutene and norbornene moieties, the conditions using THF as the solvent at 0 °C offer a useful protocol for the selective ROMP of cyclobutene to give norbornene-appended polycyclobutene. Unsymmetricalladderphane having polycyclobutene and polynorbornene as two strands is obtained by
further ROMP of the norbornene appended polycyclobutene in the presence of Grubbs first generation catalyst in DCM at ambient temperature. Methanolysis of this unsymmetricalladderphane gives polycyclobutene methyl ester and insoluble polynorbornene-amide-alcohol. The latter is converted into the
strand is 8:1.
Keywords: cyclobutene; hydrolysis; linker; metathesis; norbornene; ROMP; selectivity; unsymmetricalladderphane; Introduction
Ring-opening metathesis polymerizations (ROMP) of strained cycloalkenes offer a powerful arsenal for the synthesis of polymers having a variety of fascinating
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Graphical Abstract
Scheme 1:
Strategy for sequential ROMP of 1 to yield 3.