US 5,929,270 A · Process for preparing distyrylbiphenyl compounds

Abstract

A process is provided for the production of compounds having the formula: ##STR1## in which R is hydrogen, C.sub.1 -C.sub.5 alkyl, cyano or halogen; M is hydrogen or a salt-forming colorless cation; and n is 2; which process comprises reductively de-aminating a compound having the formula: ##STR2## in which R and n have their previous significance and M' is hydrogen, a salt-forming colorless cation or optionally substituted phenyl; and converting any optionally substituted phenyl group M' to a group M. The present invention also provides processes for the production of the compounds of formula (2) and various novel intermediates for use in the new processes. The compounds of formula (1) are useful as fluorescent whitening agents.

Claims32

Dependent claims

A process for the production of compounds having the formula:

##STR27## in which R is hydrogen, C.sub.1 -C.sub.5 alkyl, cyano or halogen;
M is hydrogen or a salt-forming colourless cation;
and n is 2;
which process comprises reductively de-aminating a compound having the formula:
##STR28## in which R and n have their previous significance and M' is hydrogen, a salt-forming colourless cation or optionally substituted phenyl;
and converting any optionally substituted phenyl group M' to a group M.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

09/081,426Filed 19 May 1998

Granted

27 Jul 1999

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

C07C 309/46
Containing nitrogen atoms, not being part of nitro or nitroso groups, bound to the carbon skeleton: having the sulfo groups bound to carbon atoms…
C07C 309/32
Of non-condensed six-membered aromatic rings: containing at least two non-condensed six-membered aromatic rings in the carbon skeleton
C07C 309/40
Having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton: containing nitro or nitroso groups bound to the…
C07C 309/73
Having sulfur atoms of esterified sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton: to carbon atoms of…

Process for preparing distyrylbiphenyl compounds

Life of this patent

Process for preparing distyrylbiphenyl compounds

Life of this patent

Abstract

Claims32