Ethynyl-containing phthaloyl halides
 Aromatic monomers, each containing at least one o-ethynyl carboxylic acid halide subunit: ##STR1## wherein X is Cl or Br. These monomers can be reacted with amines to form aromatic polyamide resins which can be thermally treated to undergo intromolecular cyclization, without evolution of volatiles, into polyimidines. 
The United States of America as represented by the Secretary of the Air Force
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Robert C. George J.
Evers Moore