反应详情

N-(3-Chloro-5,5-dimethylcyclohex-2-en-1-ylidene)-pyrrolidinium perchlorate (4.7 g., 0.015 mol.), methylsulfonylacetonitrile (1.8 g., 0.015 mol.) and triethylamine (4.6 ml.) are dissolved in ethanol (15 ml.) and heated at reflux for 5 minutes. After chilling, the crude dye is collected on a filter, washed with methanol and dried. After one recrystallization from pyridine/methanol, the yield of purified dye is 1.2 g. (27%), m.p. 260°-261°C. with decomposition. The above dye compound has excellent absorption characteristics in the ultraviolet region of the spectrum as shown in Table 1 below.

1. temperatureheated
2. temperatureat reflux for 5 minutes
3. temperatureAfter chilling
4. customthe crude dye is collected on a filter
5. washwashed with methanol
6. customdried
7. customAfter one recrystallization from pyridine/methanol
8. customabsorption characteristics in the ultraviolet region of the spectrum