## Abstract **Summary:** Optically active poly[(__R__)โ or (__S__)โ1,4โbis(2โ(3โฒ,4โฒโethylenedioxy)thienyl)โ2โbenzoic acid 1โmethylheptyl ester] was prepared by an electrochemical technique and characterized by circular dichroism measurements. It was found that the optical activity and optical rotat
โฆ LIBER โฆ
Synthesis and optical properties of poly(phenylenevinylene) modified with 3,4-bis(phenylene)-3-cyclobutene-1,2-dione moiety
โ Scribed by Jae Kyun Jeong; Sung Jae Choi; Tae Hyung Rhee; Nam Choul Yang; Dong Hack Suh
- Publisher
- Springer
- Year
- 1999
- Tongue
- English
- Weight
- 407 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0170-0839
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## Abstract Syntheses of 1,3โ2,4โcalix[4]bisโcrown ethers (**1** and **2**) fixed in the 1,3โalternate conformation by 1,3โ and 2,4โbridges made of two modified polyether chains each containing two 1,2โphenylene residues and one pyridine or anisyl unit are reported. The structures of compounds **1*