US 4,161,589 AGranted

Spirodipyrans

AssigneeBASF SE

InventorsHans Baumann, Andreas Oberlinner

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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, R.sup.1 is alkyl, phenyl, substituted alkyl or phenalkyl and R.sup.2 is hydrogen, or R.sup.1 and R.sup.2 together are trimethylene which is unsubstituted or substituted by 1, 2 or 3 alkyl and 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.

Claims7

Dependent claims

A spirodipyran of the general formula ##STR61## where A is the radical of a fused benzene ring which is unsubstituted or is substituted by alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, nitro, chlorine, bromine or carboalkoxy (where alkoxy is of 1 to 6 carbon atoms), or is the radical of a naphthalene ring fused in the 2,1-position, which is unsubstituted or substituted by chlorine, bromine or carboalkoxy (where alkoxy is of 1 to 6 carbon atoms),

R.sup.1 is alkyl of 1 to 16 carbon atoms or is phenyl which is unsubstituted or substituted by alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, chlorine or bromine, or is phenalkyl of 7 to 10 carbon atoms and
R.sup.2 is hydrogen, or
R.sup.1 and R.sup.2 together are a trimethylene bridge which is unsubstituted or in which one, two or three H atoms are replaced by alkyl of 1 to 12 carbon atoms, and
B is N-morpholinyl, which is unsubstituted or substituted by one or two methyl, or is N-thiomorpholinyl-S-dioxide, N-(N'-alkyl)-piperazinyl (where alkyl is of 1 to 4 carbon atoms) or N-isoindolinyl.

1 more element

Dependencies are inferred from the claim text.