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用对苯二甲醛或间苯二甲醛与5,5-二甲基-1,3-环己二酮反应,在不同条件下得到了含有双4(H)-吡喃、1,4_二氢吡啶结构单元的双一氧杂蒽衍生物、双-吖啶衍生物、以及双-AL羟基吖啶衍生物. 相似文献
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脂肪族二醛是一类重要的工业化学品中间体,可以经过氧化、还原、氢酯化、氢胺化等反应获得二酸、二醇、二酯、二胺等各种重要的化学品。本文报道了一种以丁二烯下游中间体——7-辛烯醛为原料的铑催化氢甲酰化反应合成1,9-壬二醛的方法,考察了不同膦配体对催化剂性能的影响,对反应工艺条件进行了研究和优化。使用Rh(I)/Xantphos催化剂,较优工艺条件下,7-辛烯醛转化率>99%,直链壬二醛收率86%,醛产物正异比27,TON可达49500。最后,对7-辛烯醛的氢甲酰化主反应和副反应机理进行了探讨。 相似文献
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研究了α-重氮-β-二酮与各类羰基化合物的环加成反应,合成了一系列4H-1,3-二噁环己-5-烯-4-酮衍生物. 相似文献
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在常温1-(1, 3-二噻-2-亚基)丙酮1f是无气味的、稳定的白色固体,它易通过易制备的3-(1, 3-二噻-2亚基)-2, 4-戊二酮1b的酸性条件下的脱乙酰化反应制得,产率为86%。在MeCOCl/MeOH体系中,在常温和回流条件下,1f能作为有效的1, 3-丙二硫醇替代试剂与醛和酮进行缩硫醛/酮化反应,高产率(86-99%)合成1, 3-二噻烷衍生物。与已报道的硫醇替代试剂1a-e相比,在缩硫醛/酮化反应中1f是活性最好的1, 3-丙二硫醇替代试剂。 相似文献
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α,α-二乙酰基二硫缩烯酮和芳醛的缩合反应研究 总被引:4,自引:0,他引:4
在碱性条件下,α,α-二乙酰基二硫缩烯酮和芳醛的缩合反应受烷硫基的影响.α,α-二乙酰基二苄硫缩烯酮1和芳醛3缩合生成单面缩合脱乙酰基产物α-肉桂酰基二苄硫缩烯酮4;α,α-二乙酰基环二硫缩烯酮2和芳醛3缩合生成双面缩合产物α,α-二肉桂酰基环二硫缩烯酮5. 相似文献
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在琥珀酸二酰亚胺磺酸铈催化下,吲哚、醛和2,2-二甲基-1,3-二噁烷-4,6-二酮在无溶剂条件下超声辐射合成了10种5-[(3-吲哚基)-甲基]-2,2-二甲基-1,3-二噁烷-4,6-二酮衍生物.当催化剂的用量为3%(摩尔分数)时,30℃反应30~60 min,收率为68.9%~96.7%.此外,还探讨了琥珀酸二酰亚胺磺酸铈的催化机理.该方法具有条件温和,反应时间短且收率高的优点.催化剂邻琥珀酸二酰亚胺磺酸铈对环境友好且可循环利用. 相似文献
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Yohsuke Yamamoto Shiro Matsukawa Shin-ya Furuta Kin-ya Akiba 《Phosphorus, sulfur, and silicon and the related elements》2013,188(6-7):1375-1379
Solution and crystal structures of monocyclic pentacoordinate phosphoranes bearing two Martin ligands and two carbon substituents are described. When the two carbon substituents are different, relative apicophilicity of the two monodentate carbon substituents could be determined based on the equilibrium ratio of the pseudorotamers. In some cases, x-ray structural analysis could be carried out and the crystallized structure from CH 3 CN is consistent with the major pseudorotamer in solution (CD 3 CN). Furthermore, when the equilibrium ratio of pseudorotamers is almost unity, novel cocrystallization of two pseudorotamers in a single crystal was observed. 相似文献
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[reaction: see text] Follicular fluid-meiosis activating sterol (FF-MAS) has been shown to be an efficient inducer of meiotic maturation. It can potentially be used for improvements of in vitro fertilization techniques. Two short synthesis of FF-MAS are presented in this article. Both syntheses are based on microbiological degradations of sterol side chains. FF-MAS can be synthesized in nine steps from commercially available starting materials by both routes. 相似文献
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Jonathan Bould John D. Kennedy Mark Thornton-Pett Lawrence Barton Nigam P. Rath 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(1):49-51
Two iridanonaborane compounds, 4-carbonyl-5,6:8,9-bis-μH-4-hydrido-4-bis(trimethylphosphine)-4-irida-arachno-nonaborane(12), [IrH(B8H12)(C3H9P)2(CO)], (Ia), and 2-carbonyl-2,5:6,9:8,9-tri-μH-4-chloro-2-bis(trimethylphosphine)-2-irida-nido-nonaborane(11), [Ir(B8H10Cl)(C3H9P)2(CO)], (II), are described. Compound (II) shows evidence of effective chlorine-substituent migration during its formation. 相似文献