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Derivate des 5, 6‐Dihydro‐ p ‐dithiin‐2, 3‐dicarbonsäure‐anhydrids, I: Imide
Author(s) -
Schweizer H. R.
Publication year - 1969
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19690520806
Subject(s) - imide , phthalic anhydride , chemistry , maleic anhydride , nitrogen , electron acceptor , polymer chemistry , organic chemistry , catalysis , polymer , copolymer
5. 6‐Dihydro‐ p ‐dithiin‐2. 3‐dicarboxylic anhydride reacts with primary amines quite readily to form the substituted imides. The imide formation occurs much more easily than with maleic or phthalic anhydride. The imide and all N‐substituted imides have a fairly strong, bright yellow colour. Their absorption spectra differ considerably from those of the anhydride, ester and dinitrile. Electron‐attracting substituents on the imide nitrogen increase the absorption maximum somewhat, while strongly electron‐releasing groups decrease it, and may even shift it to a shorter wave‐length. It is therefore concluded that the imide nitrogen is part of the election acceptor group of the chromorphoric system.