碘全氟烷基醇R F CH 2 CHI(CR 2)n OH(R F = C 6 F 13; R = H,CH 3;n = 1-3,9)易于通过添加全氟烷基碘来制备R F I在催化量(10%摩尔)的金属铜粉存在下于120°C转化为烯丙基和其他不饱和醇。在大多数情况下,过氧化二苯甲酰引起的反应降低了加成产物的收率。描述了碘全氟烷基化醇向环氧化物和醇的化学变化。提供了对获得的副产物和反应机理的讨论。
Radical addition reactions of fluorinated species. Part 8. Regioselectivity of radical additions to perfluoroalkylethylenes and quantum chemical calculations. Highly selective two-step synthesis of 4-(perfluoroalkyl)butane-1,2-diols
Perfluoroalkylethylenes RF–CHCH2 (RF = C4F9,C6F13,C8F17) added easily nucleophilic radicals generated from alkanols, oxolane and 2,2-dimethyl-1,3-dioxolane. The additions were initiated photochemically in the presence of acetone or by dibenzoyl peroxide and were completely regioselective and almost completely chemoselective with preparative yields up to 90%. 4-Fluoroalkylated dioxolanes obtained (5a–5c)
全氟烷基乙烯R F –CH = CH 2(R F = C 4 F 9,C 6 F 13,C 8 F 17)易于添加由链烷醇,氧杂环戊烷和2,2-二甲基-1,3-二氧戊环生成的亲核基团。该添加是在丙酮存在下或通过过氧化二苯甲酰以光化学方式引发的,并且具有完全的区域选择性和几乎完全的化学选择性,制备产率高达90%。在酸性介质中通过甲醇分解将获得的4-氟烷基化的二氧戊环(5a-5c)脱保护,得到4-全氟烷基-1,2丁二醇(15a-15c)转化为相应的双甲基丙烯酸酯(16a-16c)。2,2,4-三甲基-1,3-二氧戊环(17)反应,在两个中心,以产生与加合物的自由基对的优先攻击氟烷基二氧戊环的84:16区域异构体混合物在更空间受阻的叔C-H键17。讨论了全氟烷基乙烯加成物的完全区域选择性与全氟烷基化链的“尾部效应”以及使用PM3和从头算量子化学方法计算的中间加成基自由基的能量。
Copper-catalyzed addition of perfluoroalkyl iodides to unsaturated alcohols and transformation of the addition products
作者:M. Kotora、M. Hácek、B. Ameduri、B. Boutevin
DOI:10.1016/0022-1139(93)02993-o
日期:1994.7
Iodoperfluoroalkyl alcohols RFCH2CHI(CR2)n OH (RF= C6F13; R = H, CH3; n = 1–3, 9) have been readily prepared in high yield by the addition of perfluoroalkyl iodides RFI to allylic and other unsaturatedalcohols at 120 °C in the presence of a catalytic amount (10% mol) of metallic copper powder. The dibenzoyl peroxide-induced reaction gave lower yields of the addition products in most cases. The chemical
碘全氟烷基醇R F CH 2 CHI(CR 2)n OH(R F = C 6 F 13; R = H,CH 3;n = 1-3,9)易于通过添加全氟烷基碘来制备R F I在催化量(10%摩尔)的金属铜粉存在下于120°C转化为烯丙基和其他不饱和醇。在大多数情况下,过氧化二苯甲酰引起的反应降低了加成产物的收率。描述了碘全氟烷基化醇向环氧化物和醇的化学变化。提供了对获得的副产物和反应机理的讨论。