N(CCO)CCO.CCOCC.[CH2:13]([CH:15]([C:19]([CH3:21])=[O:20])[C:16]([OH:18])=[O:17])C.[N+]([O-])([O-])=O.[Ag+:26]>O>[CH3:13][CH:15]([C:19]([CH3:21])=[O:20])[C:16]([O-:18])=[O:17].[Ag+:26]Diethanolamine (4.4 g) was dissolved in water (5 mL), and this solution was added to the ether solution of α-ethylacetoacetic acid while cooling with ice. Next, a solution of silver nitrate (6.8 g) dissolved in water (8 mL) was added dropwise. The white precipitate that precipitated was filtered off, washed with ice water and then isopropanol, and dried, yielding silver α-methylacetoacetate as a white precipitate (yield 6.7 g). FIG. 6 shows the infrared absorption spectrum (IR) of the silver α-methylacetoacetate that was obtained. IR:1700 cm−1, 1547 cm−1.
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