Irradiation of terminal aromatic gamma,delta-epoxy ketones with a 450 W UV lamp led to Norrish type II cyclization/semi-pinacol rearrangement cascade reaction which formed the benzocyclobutanones containing a full-carbon quaternary center, whereas irradiation of substituted aromatic gamma,delta-epoxy ketones led to the indanones through a photochemical epoxy rearrangement and 1,5-biradicals cyclization
Unexpected Pyrolytic Behaviour of Substituted Benzo[c]thiopyran and Thieno[2,3-c]thiopyran S,S-dioxides
作者:R. Alan Aitken、Clémence Hauduc、M. Selim Hossain、Emily McHale、Adrian L. Schwan、Alexandra M. Z. Slawin、Colin A. Stewart
DOI:10.1071/ch14155
日期:——
formation of anthracene via an isomeric 7-membered sultine with loss of SO, CO and methane or butane, and formation of 4-ethylidene-4,5-dihydrocyclobuta[b]thiophenes by way of SO loss, a radical rearrangement, and extrusion of acetone. The analogues with a halogen substituent at position 8 on the benzene ring require a higher temperature to react and give naphthalene resulting from net elimination of
如前所述,对苯并[ c ]硫代吡喃S,S-二氧化物(1)进行快速真空热解(FVP)导致形成茚和2-乙烯基苯甲醛。发现具有不同取代模式的八个类似物的范围表现不同。通常,不存在SO 2的挤出以产生类似于茚的产物,但是在大多数情况下,通过环扩展成7元环丁二烯,SO的挤出和分子内形成了类似于2-乙烯基苯甲醛的不饱和羰基产物。氢原子转移。观察到的其他过程包括通过异构的7元磺胺形成蒽,并损失SO,CO和甲烷或丁烷,以及形成4-亚乙基-4,5-二氢环丁[b ]噻吩通过SO的损失,自由基的重排和丙酮的挤出。苯环上第8位具有卤素取代基的类似物需要更高的温度才能发生反应,并通过净除去HX和SO 2生成萘。还报道了1的X射线晶体结构。
Photosensitive compositions containing carbonylic halides as activators
申请人:Dynachem Corporation
公开号:EP0005379A2
公开(公告)日:1979-11-14
Compositions containing a polymerizable, curable or crosslinkable component. a photoinitiator, a colorformer capable of changing color upon contact with a suitable activator and a latent activator containing an organic halide will become insoluble and change color under the influence of actinic radiation. The organic halide is a carbonylic compound such as an aliphatic or cycloaliphatic ketone or an ester or amide of a dicarboxylic acid. The compositions are useful to make resists used in the electronics industry to manufacture printed circuits.
Phototropic photosensitive compositions containing a fluoran colorformer
申请人:Dynachem Corporation
公开号:EP0005380A2
公开(公告)日:1979-11-14
Compositions containing a polymerizable, curable or crosslinkable component, a photoinitiator, a fluoran colorformer and a latent activator that releases or promotes the release of a Lewis acid, will become insoluble and change color under the influence of actinic radiation. These compositions are particularly useful to make dry film photoresists, which are widely used in the electronics industry to manufacture printed circuits.