Carbonyloxy-substituted azulenesquaric acid dyes, intermediates

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters

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560128, 560103, C07C 6952

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active

057288674

ABSTRACT:
Carbonyloxy-substituted azulenesquaric acid dyes of the formula ##STR1## where L is C.sub.1 -C.sub.12 -alkylene which may be substituted by phenyl,

REFERENCES:
Angewandte Chemie, 78, 1966, p. 937, W. Ziegenbein, et al., "Kondensationsprodukte Aus Quadratsaure Und Azulen-Kohlenwasserstoffen".
Dyes and Pigments, vol. 8, 1987, pp. 381-388, S.H. Kim, et al., "Synthesis and Characteristics of Infrared Absorbing 2:1 Nickel Complex Dyes".
Journal of Organic Chemistry, Band 38, Nr. 6, 1973, Seiten 1106-11-American Chemical Society, Easton, US; R.N. McDonald et al.: "Nonbe aromatic systems" *Seite 1107, right-hand column, formulas; page right-hand column, formulas*.

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