The introduction of the unsaturated R group in the dye molecule is preferably carried out by a reaction between a Rhodamine having a free carboxyl group in position 2′, and {HEAD ~ an unsaturated halogenated derivative}, performing {TAIL ~ the reaction} in the presence of a base, such as anhydrid solid carbonate 
performing
The introduction of the unsaturated R group in the dye molecule is preferably carried out by a reaction between a Rhodamine having a free carboxyl group in position 2′ , and { HEAD ~ an unsaturated halogenated derivative } , performing { TAIL ~ the reaction } in the presence of a base , such as anhydrid solid carbonate
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