Alternative synthetic routes to hydrofluoroolefins
摘要:
A series of hydrofluoroolefins with -CF=CH2, -CH=CHF and -CH=CF2 groups were designed and prepared via various synthetic routes, including HX or BrF elimination, Wittig-type olefination or fluorination using SF4. (C) 2015 Elsevier B.V. All rights reserved.
经由各自的酰氯的脱卤化氢,分别原位产生氟代烯,二氟代烯,甲基氟代烯,三氟甲基氟代烯和苯基氟代烯。在存在环戊二烯的情况下,除了二氟乙烯烯外,均获得了[2 + 2]加合物。在不存在环戊二烯的情况下,低温19 F nmr指示存在烯酮的潜在前体酰基铵盐和烯醇化物,但无法明确检测到实际的烯酮物种。立体化学结果与目前公认的基于乙烯的环烯加成中立体化学测定的基于机理的机理基本一致。
Competitive Cyclization in the Reaction of Hexafluoropropene with 2-Aminobenzamide
作者:Takeshi Nakai、Nabil M. Hassan、Nobuo Ishikawa
DOI:10.1246/bcsj.50.3014
日期:1977.11
The reaction of hexafluoropropene(HFP) with 2-aminobenzamide afforded 2-(1,2,2,2-tetrafluoroethyl)-4(3H)-quinazolinone (4) and N-(2-cyanophenyl)-2,3,3,3-tetrafluoropropionamide (5) in ca.1 : 1 ratio, which is essentially independent of the reaction temperatures ranging from room temperature to 100 °C. The formation of the two products is explained in terms of the competitive cyclization of the imidoyl fluoride intermediate, the N-6 and O-6 ring closures ultimately yielding 4 and 5, respectively. In contrast to the HFP reaction, 2-(trifluoromethyl)pentafluoropropene (OFIB) and 2-aminobenzamide gave only the O-6 cyclized product, N-(2-cyanophenyl)-2-trifluoromethyl-3,3,3-trifluoropropionamide. The difference in reactivity between HFP and OFIB is discussed.
Process for producing fluorine-containing carboxylic acids
申请人:Nippon Mining Co., Ltd.
公开号:US05126482A1
公开(公告)日:1992-06-30
Novel fluorine-containing compounds and processes for producing the same are disclosed, the compounds being represented by the general formula (I): ##STR1## wherein R.sup.1 represents an alkyl group or an alkylvinyl group; R.sup.2 represents a fluoroalkyl group; and Y represents a carboxyl group, a chloroformyl group, an alkoxyalkoxycarbonyl group or a hydroxymethyl group.