Monoterpenoids and their glycosides from the leaf of thyme
摘要:
From the polar portion of the methanol extract of thyme (leaf of Thymus vulgaris; Labiatae), which has been used as an important stomachic, carminative, a component of prepared cough tea, and a spice, seven monoterpenoid glycosides were isolated together with two known monoterpenoids and three known monoterpenoid glucosides. Structures of the seven monoterpenoid glycosides were determined by spectral analysis. (C) 2004 Elsevier Ltd. All rights reserved.
Monoterpenoids and their glycosides from the leaf of thyme
摘要:
From the polar portion of the methanol extract of thyme (leaf of Thymus vulgaris; Labiatae), which has been used as an important stomachic, carminative, a component of prepared cough tea, and a spice, seven monoterpenoid glycosides were isolated together with two known monoterpenoids and three known monoterpenoid glucosides. Structures of the seven monoterpenoid glycosides were determined by spectral analysis. (C) 2004 Elsevier Ltd. All rights reserved.
immobilization of tungsten peroxo complex was highly temperature-dependent. The tungsten peroxo complex can dissociate and diffuse into the liquid phase at reaction temperature, resulting in a homogeneous reaction. Nevertheless, the catalytically active species was anchored on the imidazole-functionalized silica by hydrogen bonding as the temperature was lowered to 0 °C after the reaction, which thus offered a
合成了由二齿吡啶甲酸配体稳定的过氧钨配合物,然后成功地将其固定在咪唑官能化的二氧化硅上。固定化的钨基催化剂被用作由烯烃和甲醇与H2 O2一锅合成β-烷氧基醇的有效催化剂。关于催化剂评估和通过各种方法表征的结果,证明了过氧化钨配合物的固定化高度依赖于温度。过氧化钨络合物可以在反应温度下解离并扩散到液相中,从而导致均相反应。然而,随着反应后温度降低至0°C,催化活性物质通过氢键键合固定在咪唑官能化的二氧化硅上,因此,它提供了一种高效的方法来使催化剂连续循环使用。另外,在相对温和的条件下,H 2 O 2可将各种烯烃以良好的转化率和选择性转化为相应的β-烷氧基醇。
Über die Reaktionsprodukte der jodometrischen Gehaltsbestimmung von Ascaridol
作者:Gerhard Rücker、Ulrich Molls
DOI:10.1002/ardp.19803130308
日期:——
entstehen mindestens 15 Reaktionsprodukte, von denen 7 Substanzen schon durch Umsetzung von etwa 5–10% 10 mit Säure gebildet werden (1a, b, 2a, b, 3, 4, 14). Die Reduktion von 10 durch Jodid verläuft, wie schon früher von Böhme u. Mitarb. diskutiert, zu cis‐2‐p‐Menthen‐diol‐1,4 (11), das anschließend mit Säure in die isomeren Menthendiole 5, 6 und 8 undihre Mono‐Acetate übergeht bzw. mit Jodid in einer reduktiven
Monoterpenoids and their glycosides from the leaf of thyme
作者:J KITAJIMA、T ISHIKAWA、A URABE、M SATOH
DOI:10.1016/j.phytochem.2004.09.010
日期:2004.12
From the polar portion of the methanol extract of thyme (leaf of Thymus vulgaris; Labiatae), which has been used as an important stomachic, carminative, a component of prepared cough tea, and a spice, seven monoterpenoid glycosides were isolated together with two known monoterpenoids and three known monoterpenoid glucosides. Structures of the seven monoterpenoid glycosides were determined by spectral analysis. (C) 2004 Elsevier Ltd. All rights reserved.