Spirodipyrans useful as dye precursors for copying processes

Details Spirodipyrans useful as dye precursors for copying processes Spirodipyrans useful as dye precursors for copying processes

1975-06-05

1977-06-14

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603455, 96 48R, 96 90PC, 96 48QP, 96 90R, 96 88, 96 15, 8 7, C07D31102, C07D31172

Patent

active

040296776

ABSTRACT:
New spirodipyrans of the formula ##STR1## in which A is an optionally substituted benzene or naphthalene nucleus, B is dimethylene, trimethylene or tetramethylene substituted by from 1 to 3 alkyl groups and R.sup.1 and R.sup.2 are each alkyl of 1 to 6 carbon atoms, which may be substituted by cyano. The compounds (I) give deep blue to violet colorations with acid materials. They may be used for the manufacture of pressure-sensitive recording materials. The compounds (I) exhibit improved solubility in the solvents used for the manufacture of microcapsules.

REFERENCES:
patent: 2978462 (1961-04-01), Berman et al.
patent: 3022318 (1962-02-01), Berman et al.
patent: 3666525 (1972-05-01), Kimura et al.
patent: 3810762 (1974-05-01), Laridon et al.
patent: 3810763 (1974-05-01), Laridon et al.
patent: 3896126 (1975-07-01), Oberlinner et al.
patent: 3899514 (1975-08-01), Baumann et al.

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