Novel approach to ladder-type polymers: Polydithiathianthrene via the intramolecular acid-induced cyclization of methylsulfinyl-substituted poly (meta-phenylene sulfide)

摘要

The acid-induced intramolecular cyclization reaction of aromatic methylsulfinyls has proven to be a suitable synthetic tool for the preparation of ladder-type oligomers and polymers on the basis of thianthrene (=9,10-dithiaanthracene"). This approach allows for the synthesis of tetrathiapentacene oligomers in high yields. The concept was transferred to a polymer-analogous reaction of a methylsulfinyl substituted poly(meta-phenylene sulfide) precursor, which under strongly acidic conditions and following demethylation gave a double-stranded known as polydithiathianthrene. poly(phenylene sulfide), Although the resulting ribbon is not defect-free, the high of cyclization via this novel technique has been demonstrated by detailed spectroscopic and spectrometric studies. [References: 33]