CCCCN1C(=O)N(CCCC)C(=O)C(=C/C=C/C=C2/N(CCCS([O-])(=O)=O)C3C(O/2)=CC=CC=3)C1=O.[Na+].[CH2:39]([N:41]1[C:45](=[O:46])[C:44](=[C:47](Cl)[CH:48]=[C:49]2[N:53]([CH2:54][CH3:55])[C:52]3[CH:56]=[CH:57][CH:58]=[CH:59][C:51]=3[S:50]2)[S:43][C:42]1=[S:61])[CH3:40].C(#N)C.[I-].[Na+]>C(N(CC)CC)C>[CH2:39]([N:41]1[C:45](=[O:46])[C:44](=[C:47]=[C:48]=[C:49]2[N:53]([CH2:54][CH3:55])[C:52]3[CH:56]=[CH:57][CH:58]=[CH:59][C:51]=3[S:50]2)[S:43][C:42]1=[S:61])[CH3:40]A mixture of the merocyanine dye of Example 9 (1 g), acetonitrile (100 ml), sodium iodide (5 g) and triethylamine (7 ml) are heated at reflux with stirring for 1 minute and chilled immediately. The dye is collected and washed sequentially with acetonitrile, water, acetonitrile and ether. After recrystallization from acetonitrile, the yield of purified dye is 0.57 g (63%).
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