condition using cetyltrimithylammonium bromide (CTAB) as surfactant. This solid was characterized using several techniques e.g. powder X-ray diffraction (XRD), N2 adsorption-desorption, FT-IR, TG/DTG and pyridine adsorption-desorption followed by IR spectroscopy. The catalytic performance of Al-MCM-41 catalyst as Lewis acid was used without treatment and was compared with TiCl4 in the allylation of aromatic
摘要 以十六烷基三甲基溴化铵(CTAB)为表面活性剂,在水热条件下合成了Si/Al比为12.5的介孔Al-MCM-41分子筛。使用几种技术表征该固体,例如粉末 X 射线衍射 (XRD)、N2 吸附-解吸、FT-IR、TG/DTG 和吡啶吸附-解吸,然后是红外光谱。Al-MCM-41 催化剂作为路易斯酸的催化性能在未经处理的情况下使用,并与 TiCl4 在芳族醛与烯丙基三甲基硅烷的烯丙基化反应中进行了比较。结果表明,在 Al-MCM-41 的存在下,无论芳香醛的性质如何,在 35 °C 的温度下都获得高烯丙基甲硅烷基醚。当使用 TiCl4 时,反应需要 -85 °C 的温度,并且获得的所有产物都是由于二烯丙基化。为了解释在 Al-MCM-41 或 TiCl4 存在下这种不同的烯丙基化,提出了两种可能的反应机制。Al-MCM-41 用于连续四次实验,没有明显的活性损失,证实了它的稳定性。最后,
Cationic Cobalt Porphyrin-Catalyzed Allylation of Aldehydes with Allyltrimethylsilanes
porphyrin-catalyzed allylation of aldehydes with allyltrimethylsilanes is developed. The formation of the aldehyde–cobalt porphyrin complex, the key intermediate for the addition of allylsilanes, is confirmed by theoretical studies and synchrotron-based X-ray absorption fine-structure measurements. Facile dissociation of the product by allylation from the cobalt complex regenerates the active complex with
Montmorillonite K10 clay-catalyzed synthesis of homoallylic silyl ethers: an efficient and environmentally friendly Hosomi–Sakurai reaction
作者:Matthew R. Dintzner、Yawo A. Mondjinou、Barrett Unger
DOI:10.1016/j.tetlet.2009.09.051
日期:2009.12
Aromatic aldehydes react with allyltrimethylsilane in the presence of activated Montmorillonite K10 clay to give homoallylic silyl ethers in good to excellent yields.