Four novel tetraarylurea calix[4]arenes (4a–d) have been synthesized, substituted by ω-alkenyloxy residues in 3,5-positions of the arylurea residues. The eight alkenyl groups were pairwise connected by olefin metathesis and subsequent hydrogenation. The ring-closure reaction was carried out with heterodimers exclusively formed by 4 with a tetratosylurea calix[4]arene 1, which serves as a template in
Surface-Initiated Ring-Opening Metathesis Polymerization (SI-ROMP): Synthesis and Electropolymerization of Terthiophene-Functionalized Olefin Peripheral Dendrons
作者:Guoqian Jiang、Ramakrishna Ponnapati、Roderick Pernites、Mary Jane Felipe、Rigoberto Advincula
DOI:10.1021/ma101746e
日期:2010.12.28
We report on the synthesis and electrodeposition of peripheral olefin dendrons with electropolymerizable focal point terthiophene units. These films were utilized for surface initiated ring-openingmetathesispolymerization (SI-ROMP) of norbornene to form grafted polynorbornene brushes. The dendrons were first electrodeposited on an electrode surface, forming a highly dense and uniform polythiophene-type
Synthesis of huge macrocycles using two calix[4]arenes as templates
作者:Yudong Cao、Leyong Wang、Michael Bolte、Myroslav O. Vysotsky、Volker Böhmer
DOI:10.1039/b505223h
日期:——
Macrocycles with up to 100 atoms have been synthesised using two calix[4]arenes as templates: first, (3,5-dialkenyloxy)phenyl groups are attached to the wide rim of a calix[4]arene via urea links, then the alkenyl groups are connected via a metathesis reaction using a tetratosylurea calix[4]arene for their correct prearrangement and finally the urea functions are cleaved to detach the newly formed