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.
exception of allyl 3-methoxyphenyl ether (5), m-substituted allyl arylethers show similar behaviour (with respect to the composition of the product mixture) to that observed in the thermal rearrangement (Table 3). The rearrangement of allyl arylethers with an alkyl group in the o-position, in the prescence of boron trichloride, yields a mixture of o- and p-allyl phenols, where more p-product is present