## Abstract A Vilsmeier adduct derived from arylsulfonyl chlorides and DMF in pyridine was successfully used as a new condensating agent for the synthesis of aromatic polyesters by the direct polycondensation of aromatic dicarboxylic acids and bisphenols and also of hydroxybenzoic acids. Polymers o
Further study of the direct polycondensation reaction of hydroxybenzoic acids with tosyl chloride and N,N-dimethylformamide
β Scribed by Higashi, Fujuki ;Takahashi, Ikuo ;Akiyama, Naoki ;Chang, Teh-Chong
- Publisher
- John Wiley and Sons
- Year
- 1984
- Weight
- 174 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0360-6376
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## Abstract Direct polycondensation reaction of hydroxybenzoic acids with diphenyl chlorophosphate (DPCP) in pyridine was largely improved by carrying out the reaction in the presence of a formamide. Among the formamides examined, __N__,__N__βdimethylformamide (DMF), __N__,__N__βdimethylformamide,
Maahs and Hegenberg in their review of the chemistry of squaric acid (I) state: "Das Slure-dichlorid der QuadratsWure, Dichlor-cyclobutendion, lllsst sich aus Quadratsgure nicht herstellen." (1) Since dichlorocyclobutenedione (II) (2) is an important intermediate in the preparation of mono-and diary
The Raman spectra of POCI,, HCONMe,, PhCONMe, and reaction mixtures of POCl, and HCONMe,, and POCl, and PhCONMe, have been recorded in an attempt to establish the nature of the reaction products. Assignments for most of the bands observed in the spectra of the reaction product are given. The spectra