A series of layered cyclophanes where an anthracene ring is stacked in different modes with the same or other π-systems has been synthesized by the Hofmann elimination method or photodesulfurization for studying the transannular π-electronic interaction. Photochemical and thermal interconversions have been observed between syn-(1,4)anthracenophane and its isomer and have been discussed with reference
通过霍夫曼消除法或光脱硫法合成了一系列层状环芳,其中蒽环以不同模式堆叠,具有相同或其他 π 系统,用于研究跨环 π 电子相互作用。已经观察到合成-(1,4) 蒽及其异构体之间的光化学和热相互转化,并参考 X 射线晶体数据进行了讨论。从电子光谱已经确定跨环相互作用随着两个面对的芳环之间的重叠而增加,并且当两个生色团之间的重叠相同时,相互作用相对于面对生色团的尺寸增加。
Verfahren zur Herstellung von (2,2)-Paracyclophan
申请人:MERCK PATENT GmbH
公开号:EP0108297A1
公开(公告)日:1984-05-16
Die Erfindung betrifft ein neues Verfahren zur Herstellung von [2,2]-Paracyclophan durch Hofmann-Eliminierung aus p-Methylbenzyltrimethylammoniumhydroxid in Gegenwart einer Base, dadurch gekennzeichnet, daß man als Base Natrium- oder Kaliumhydroxid in Gegenwart von Dimethylsulfoxid verwendet.
Process for the preparation of (2,2)-paracyclophane
申请人:Montedison S.p.A.
公开号:EP0183083A1
公开(公告)日:1986-06-04
Process for the preparation of (2,2)-paracyclophane starting from p.methyl-benzyl-trimethyl-ammonium halide, consisting in first preparing the p.methyl-benzyl-trimethyl-ammonium hydroxide and successively subjecting the product thus obtained to the HOFMANN Elimination in the presence of a biphasic system consisting of an inert organic solvent and an alkaline solution having a concentration of at least 20% by weight.
The present invention refers to a process for the preparation of (2,2)-paracyclophane of the general formula:
More particularly, the present invention relates to a process for the preparation of (2,2)-paracyclophane of formula (1), starting from a p.methyl-benzyl-trimethyl-ammonium halide of the formula:
wherein: X is a halide such as chlorine, bromine, etc., by the elimination of HOFMANN.
Process for the preparation of halogenated (2,2)-paracyclophanes
申请人:Montedison S.p.A.
公开号:EP0220744A1
公开(公告)日:1987-05-06
A process for the preparation of halogenated (2,2)-paracyclophanes by Hofmann elimination in an alkaline medium from p-methylbenzyltrimethylammonium hydroxide halogen-substituted in the nucleus.
Process for the preparation of dichloro-[2,2] paracyclophane
申请人:UNION CARBIDE CORPORATION
公开号:EP0291889A1
公开(公告)日:1988-11-23
A process is provided for the preparation of the dimer, dichloro-[2,2]paracyclophane, which is useful as the starting material for the deposition of conformal parylene coatings employed, for example, in the electronics industry for the protection of various sensitive electronic components.
The process avoids the normally low yields of chlorinated dimer formed by the chlorination of 2,2-paracycophane and instead utilizes the Hofmann elimination of 2(3)-chloro-p-methylbenzyltrimethylammonium hydroxide by conducting the elimination reaction under carefully controlled conditions of reaction temperature and profile, reaction feed configuration, water concentration in the reactor and the use of a cosolvent, certain reaction promoters, or a combination thereof.