Triethylamine → [5,5-Dimethyl-1-(1-pyrrolidinyl)-1-cyclohexen-3-ylidene]-(methylsulfonyl)acetonitrile

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Reaction Steps

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.

Provenance & Evidence