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If desired 5 can be isolated, see ref. 13
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If desired 5 can be isolated, see ref. 13
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48
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2342606779
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note
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A technical 50% solution of ethyl glyoxylate in toluene was concentrated at atmospheric pressure and the residue was distilled to give ethyl glyoxylate as a turbid yellow oil. A second distillation of this material at atmospheric pressure by using a 20 cm Vigreux column at a bath temperature of 160-180°C furnished ethyl glyoxylate as a yellow fluid, which was used immediately and transferred to the reaction mixture by a syringe.
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