The present invention provides new intermediate compounds enabling the preparation of N-meso substituted cyanine, merocyanine or oxonole dyes wherein the N-meso substituent comprises electron withdrawing groups and wherein such N-meso substituents are introduced at the intermediate level. These intermediates enable the formation of dyes having in the meso-position N-substituents comprising electron withdrawing groups without the need for further derivatization of the meso-substituent at the dye level.
本发明提供了新的中间化合物,使得能够制备N-间位取代的青菁、美洛青或氧酮
染料,其中N-间位取代基包括电子吸引基团,并且这种N-间位取代基在中间级别引入。这些中间体使得能够形成在间位具有N-取代基的
染料,这些取代基包括电子吸引基团,而无需在
染料级别进一步对间位取代基进行衍生化。