Phosphonium compounds, a process for their preparation and a process for the preparation of asymmetrically substituted stilbene fluorescent brightening agents

摘要

Phosphonium compounds of the formula (R)3P(+)-CH2-X-CH=CH-R1-Y(-) in which R is preferably alkyl having 1 to 4 C atoms, cyclohexyl or phenyl, R1 is a substituted or unsubstituted aromatic radical, especially a phenyl radical, X is phenylene, 4,4'-biphenylene or 1,4- or 2,6-naphthylene and Y(-) is SO3(-), SO2(-) or COO(-), a process for their preparation and a process for the preparation of asymetrically substituted fluorescent brightening agents of the formula Z-CH=CH-X-CH=CH-R1Y(-)M(+) in which R1, X and Y(-) are as defined above, M61 is a cation and Z is preferably a substituted or unsubstituted phenyl or 2-phenyl-triazol-4-yl radical, by reacting a bis-phosphonium compound of the formula <IMAGE> in which Q(-) is an anion, with an aldehyde of the formula M(+)Y(-)-R1-CHO and reacting the resulting intermediate with an aldehyde of the formula Z-CHO.