Azulenesquaric acid dyes, azulene intermediates therefor, and op

Details Azulenesquaric acid dyes, azulene intermediates therefor, and op Azulenesquaric acid dyes, azulene intermediates therefor, and op

1988-09-30

1992-01-28

Berch, Mark L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus esters

560 42, 560 45, 560 53, 560116, 560119, 562433, 562452, 562454, 562456, 562457, 562458, 562462, 562466, 562498, 562501, 564163, 564164, 564169, 564188, 564428, 564452, 564454, 564453, 564456, 564460, 568327, 568374, 430 70, G11B 724, C07C 49613, C07C 6726, C09B 5700

Patent

active

050845926

ABSTRACT:
Azulenesquaric acid dyes of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each have specified meanings are prepared from azulene derivatives of the formula ##STR2## where R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each have specified meanings as intermediates, and used in an optical recording medium.

REFERENCES:
patent: 4675423 (1987-06-01), Schrott et al.
Neidlein, et al., Helvetica Chimica Acta, vol. 65, Fasc. 1, 1982, pp. 280-285.
Ziegerbein et al, "Angewandt-Chemie"; vol. 78 (1966), p. 937.
Kim, et al., Dyes and Pigments, vol. 8, 1987, pp. 381-388.
Hafner, et al., Liebigs Annalen Der Chemie, vol. 650, 1961, pp. 80-93.

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