摘要:
The invention concerns novel monomers of formula A: (A) in which: Z represents H or CH3 and X represents O or S, and Y is a heterocyclic compound consisting of hydrogen, carbon and sulphur atoms, having 5 to 8 chains and at least two intracyclic sulphur atoms. The invention is useful for making waveguides, optical fibres and spectacle lenses.
摘要:
This invention relates to thioformamide derivatives of the formula: wherein R represents alkyl, Ar represents optionally substituted phenyl, Y represents an ethylene or methylene radical or a valency bond, and n represents 0 or 1, bioprecursors thereof and pharmaceutically acceptable salts thereof which possess useful pharmacological oroperties, processes for their preparation and compositions containing them.