Reference

Cis-3-Alkene-2,5-diones

Cis-3-Alkene-2,5-diones. (Sumitomo Chemical Co., Ltd.In this study， 81880-18-4 and 1703-52-2 are also used., Japan). Jpn. Kokai Tokkyo Koho JP 59001437 A2 6 Jan 1984 Showa, 4 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C07C049-20; C07C045-59. APPLICATION: JP 82-112117 28 Jun 1982. DOCUMENT TYPE: Patent CA Section: 23 (Aliphatic Compounds) cis-MeCOCH:CHCOCH2R (I, R = Me, C8H17, H2C:CHCH2, HCYCCH2) were prepd. by oxidn. of furans II with Cr(VI)-org. base complexes below 0°. Thus, a mixt. of 18 g CrO3, 33 mL 6 N HCl, and 14.3 g pyridine was stirred at 10-43°, mixed with 150 g Al2O3, and dried at 40° under reduced pressure to form a complex, which was treated with 3 g II (R = HCYCCH2) for 4 days at -16° to give 73% I (R = HCYCCH2). .