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bear2007铁杆木虫 (著名写手)
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检索CA 两个 每个 6币
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求 美国化学文摘 CA 124卷 编号 289555 和 260371 的信息，谢谢！ |
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bear2007(金币+12,VIP+0):十分感谢文娟的帮忙，提醒你一下，把木虫的名字改一下，不要用真名。 12-16 17:23
bear2007(金币+12,VIP+0):十分感谢文娟的帮忙，提醒你一下，把木虫的名字改一下，不要用真名。 12-16 17:23
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Search Strategy (CAN)(124:289555) Copyright (c) 1997 American Chemical Society All Rights Reserved. 124:289555 Preparation of cyclic carbonates. Dotani, Masaharu; Kanbara, Yutaka; Ookawa, Takashi (Mitsubishi Gas Chemical Co, Japan). Jpn. Kokai Tokkyo Koho JP 07330756 A2 19 Dec 1995 Heisei, 4 pp. (Japan). CODEN: JKXXAF. CLASS: ICM: C07D319-06. ICS: B01J023-02; B01J023-06; B01J023-14; B01J027-232. ICA: C07B061-00. APPLICATION: JP 94-126269 8 Jun 1994. DOCUMENT TYPE: Patent CA Section: 28 (Heterocyclic Compounds (More Than One Hetero Atom)) The title compds. are prepd. by reaction of R1CH(OH)CR2R3CH(OH)R4 [R1 - R4 = H, alkyl] with urea under reduced pressure, in the presence of a catalyst. Thus, a mixt. of urea 60.1 g (1 mol), 1,3-propanediol 95.1 g (1.25 mol), and zinc carbonate 6 g under reduced pressure (80 mmHg) was heated for 5 h at 175?to give 92.1 g 1,3-dioxan-2-one. Keywords cyclic carbonate prepn alkanediol carbonylation urea reaction alkanediol Index Entries Carbonylation carbonylation of alkanediol by urea 546-93-0 1314-13-2, uses 3486-35-9 2453-03-4 3592-12-9 17361-58-9 57-13-6, reactions 107-88-0 126-30-7 504-63-2 prepn. of cyclic carbonates Search Strategy (CAN)(124:260371) Copyright (c) 1997 American Chemical Society All Rights Reserved. 124:260371 Catalytic preparation of dialkyl carbonates from alkanediols and urea. Dotani, Masaharu; Kanbara, Yutaka; Ookawa, Takashi (Mitsubishi Gas Chemical Co, Japan). Jpn. Kokai Tokkyo Koho JP 07330686 A2 19 Dec 1995 Heisei, 6 pp. (Japan). CODEN: JKXXAF. CLASS: ICM: C07C069-96. ICS: B01J031-04; C07C068-00; C07C068-06. ICA: C07B061-00. APPLICATION: JP 94-126271 8 Jun 1994. DOCUMENT TYPE: Patent CA Section: 23 (Aliphatic Compounds) Dialkyl carbonates, useful as solvents, processing agents for synthetic fibers, materials for polymers, drugs, etc., are prepd. by (1) treatment of HOCHR1CR2R3CHR4OH (I; R1-4 = H, C1-4 alkyl) with urea and (2) treatment of the resulting 6-membered carbonates with alcs. under recycling of I obtained from step (2) to step (1). A mixt. of urea, 1,3-butanediol, Zn acetate was heated under stirring at 155?and 50 mm Hg for 5 h and the reaction mixt. contg. 4-methyl-1,3-dioxan-2-one (II, yield 88.8% at urea conversion 100%) was further treated with MeOH at 120?for 3 h to give Me2CO3 and Me 3-hydroxybutyl carbonate with selectivity 73.4 and 25.1%, resp., at II conversion 49.0%. Keywords alkyl carbonate prepn alkanediol cyclocondensation urea transesterification alc propylene carbonate transesterification alc carbonic acid dialkyl ester prepn Index Entries Cyclocondensation reaction catalysts Zn, Mg or Pb; prepn. of dialkyl carbonates from urea and alcs. while recycling alkanediols Transesterification catalysts Alcohols, reactions prepn. of dialkyl carbonates from urea and alcs. while recycling alkanediols 62502-19-6 162461-37-2 162461-38-3 175220-03-8 107-88-0 126-30-7 504-63-2 546-93-0 557-34-6 1184-55-0 3486-35-9 2453-03-4 3592-12-9 17361-58-9 105-58-8 463-79-6, dialkyl esters 616-38-6 623-96-1 57-13-6, reactions 71-23-8, reactions prepn. of dialkyl carbonates from urea and alcs. while recycling alkanediols |
2楼2009-12-16 17:09:42
