.-To a suspension of 1,3-dibenzyl-6-aminouracil (3.07 g, 10 mmol) in 20 ml of DMF was added dimethyl acetylenedicarboxylate (1.56 g, 11 mmol) and the mixture was heated at 110°f or 2 hr. To the dark red solution was added 150 ml of ether. The resulting precipitate was filtered and washed with 40 ml of ether to yield 1.62 g (39%), mp 235°. Recrystallization of a 1.1-g sample from DMF-HjO gave 0.9 g: mp 239-240°u v (pH 1) 438 nm (e 5500), 336 (6850), 270 (15,830), (pH 7) 330 (22,400), 273 (7930), (pH 11) 330 (22,100), 273 (7930);
Cyclohexanon (I) reagiert mit Diazomethan (II) zum 2‐Methyl‐cycloheptanon (III); aus dem Dimethyl‐cyclohexanon (IV), das in Form von Isomeren eingesetzt wird, entstehen die isomeren Einschiebungsprodukte (Va) und (Vb), deren Äquilibrierung untersucht wird.
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