Spirodipyrans

US4161589A · kind A · utility

Assignee

• BASF SE

Inventors

• Hans-Peter Baumann · Oberwil, CH
• Andreas Oberlinner · Ludwigshafen, DE

Key dates

• Filing date: Aug 8, 1978
• Grant date: Jul 17, 1979
• Expiry date: Aug 8, 1998

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41M5/15
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Spirodipyrans of the formula ##STR1## where A is the radical of a fused benzene ring or 2,1-naphthalene ring, the rings being unsubstituted or substituted by alkyl, alkoxy, nitro, chlorine, bromine or carbalkoxy, PA1 R.sup.1 is alkyl, phenyl, substituted alkyl or phenalkyl and PA1 R.sup.2 is hydrogen, or PA1 R.sup.1 and R.sup.2 together are trimethylene which is unsubstituted or substituted by 1, 2 or 3 alkyl and PA1 B is N-morpholinyl, substituted morpholinyl, thiomorpholinyl-S-dioxide, N-(N'-alkyl)-piperazinyl or N-isoindolinyl, And pressure-sensitive recording materials containing these spirodipyrans as dye-forming components. With electron acceptors, the spirodipyrans give reddish violet to blue colorations, while no coloration is produced on paper which has not been coated with an electron acceptor.