作为专题“现代合成中的环化策略”的一部分发布 抽象的 提出了一种绿色廉价的方案,用于通过邻烯丙基苯酚的有机催化氧化合成二氢苯并呋喃。使用2,2,2-三氟苯乙酮和H 2 O 2作为氧化系统,导致了一种非常有用的合成方法,其中各种取代的邻烯丙基苯酚均以高收率环化。 提出了一种绿色廉价的方案,用于通过邻烯丙基苯酚的有机催化氧化合成二氢苯并呋喃。使用2,2,2-三氟苯乙酮和H 2 O 2作为氧化系统,导致了一种非常有用的合成方法,其中各种取代的邻烯丙基苯酚均以高收率环化。
The microwave-accelerated Claisen rearrangement of allyl aryl ethers was investigated, in order to gain insight into the scope of the catalysts, solvents, temperatures, and substrates. Among the catalysts examined, phosphomolybdic acid (PMA) was found to greatly accelerate the reaction in NMP, at temperatures ranging from 220 to 300 °C. This method was found to be useful for preparing several intermediates
Claisen rearrangement of meta-substituted allyl phenyl ethers
作者:J. Malcolm Bruce、Yusuf Roshan-Ali
DOI:10.1039/p19810002677
日期:——
Electron-releasing substituents at the 3-position of allylphenylethers favour Claisenrearrangement of the allyl group to the 6-position, whereas electron-acceptors favour migration to the 2-position. 2-Acylhydroquinone 4-allyl ethers yield, predominantly, the 3-allyl isomers, probably because internal hydrogen bonding confers naphthalenoid character on the aryl residue.
Microwave-accelerated Claisen rearrangement in bicyclic imidazolium [b-3C-im][NTf2] ionic liquid
作者:Yung-Lun Lin、Jen-Yen Cheng、Yen-Ho Chu
DOI:10.1016/j.tet.2007.08.060
日期:2007.11
With microwaves, a chemically stable ionicliquid [b-3C-im][NTf2] recently developed in our laboratory was used as solvent and successfully applied to accelerate Claisen rearrangement reactions at high temperatures. In the presence of Lewis acid MgCl2, these thermal rearrangements could be achieved in similar reaction times but at lower temperature. For the microwavedreactions studied in this work
METHODS AND COMPOSITIONS FOR CONTROL OF GYPSY MOTHS, Lymanria dispar
申请人:Plettner Erika
公开号:US20100190865A1
公开(公告)日:2010-07-29
The invention provides in part dialkoxybenzene and eugenol compounds for controlling infestation by a
Lymantria dispar
, and methods thereof. The compounds include a compound of Formula I:
where R1 may be methyl, ethyl, propyl, n-butyl, isopentyl (3-methylbutyl) or allyl; R2 may be at positions 2, 3 or 4 and may be H, methyl, ethyl, propyl, n-butyl, isopentyl (3-methylbutyl) or allyl; and R3 may be optionally present at positions 2, 3 and 4, and is allyl; with the provisos that when R2 is at position 2, R3 if present is at position 3, or when R2 is at to position 3, R3 if present is at positions 2 or 4, or when R2 is at position 4, R3 if present is at position 2;
or of Formula II:
where R1 may be methyl, ethyl, propyl, n-butyl, isopentyl (3-methylbutyl) or allyl; or mixtures thereof.
The present invention concerns functionalized photoreactive compounds of formula (I), that are particularly useful in materials for the alignment of liquid crystals. Due to the adjunction of an electron withdrawing group to specific molecular systems bearing an unsaturation directly attached to two unsaturated ring systems, exceptionally high photosensitivities, excellent alignment properties as well as good mechanical robustness could be achieved in materials comprising said functionalized photoreactive compounds of the invention.