Irreversible E1cb mechanism in the syn eliminations from 1,2-dihalogenoacenaphthenes promoted by potassium t-butoxide in t-butyl alcohol
作者:Enrico Baciocchi、Renzo Ruzziconi、Giovanni V. Sebastiani
DOI:10.1039/c39800000807
日期:——
The lack of a significant leaving group effect and the preferential departure of the ‘poorer’ leaving group suggest an irreversible E1cb mechanism for the title reactions.
缺乏显着的离去基团效应和“较贫穷”离去基团的优先离开表明标题反应具有不可逆的E 1 cb机制。
SOME ACENAPHTHENE COMPOUNDS
作者:E. H. Charlesworth、H. Campbell、J. J. Conn、C. T. Elston、D. L. Stachiw
DOI:10.1139/v57-052
日期:1957.4.1
A new geometric isomer of 1,2-dichloroacenaphthene has been isolated among the reaction products of acenaphthylene and hypochlorous acid. Some new derivatives of acenaphthenone and acenaphthenol are reported.
Provided is curable resin composition which gives a cured article excellent in chemical resistance, dielectric properties, low water-absorption, heat resistance, flame retardance, and mechanical properties and which is usable in applications such as dielectric materials, insulating materials, heat-resistant materials, and structural materials. The curable resin composition includes a component (A) which is a polyphenylene ether oligomer having a number-average molecular weight of 700 to 4,000 and having a vinyl group at both end and a component (B) which is a solvent-soluble polyfunctional vinylaromatic copolymer which has structural units derived from monomers including a divinylaromatic compound (a) and an ethylvinylaromatic compound (b) and in which the content of repeating units derived from the divinylaromatic compound (a) is 20 mol % or higher, the ratio of the amount (wt. %) of the component (A) to that (wt. %) of the component (B) being (20 to 98):(2 to 80). The composition can further contain a layered silicate, a halogenated flame retardant, etc.
A resin composition is provided and contains a compound (A) having at least one group represented by the following Formula (1) in a molecule, a crosslinking type curing agent (B), and an azo compound (C) that has an azo group in a molecule and has no heteroatom other than a nitrogen atom constituting the azo group.
In Formula (1), n represents 0 to 10, Z represents an arylene group, and R1 to R3 each independently represent a hydrogen atom or an alkyl group.
An anti-reflection coating-forming composition is provided. This composition includes a polymer and a solvent. The polymer has a structural unit represented by the formula (1):
1
wherein R
1
is a monovalent atom other than a hydrogen atom or a monovalent group, and n is an integer of 0-4, provided that when n is an integer of 2-4, a plural number of R
1
's are the same or different; R
2
and R
3
are each a monovalent atom or group; and X is a bivalent group. The anti-reflection coating formed from this composition has a high antireflective effect, does not generate intermixing with a resist film, and enables a good resist pattern profile excellent in resolution and precision in cooperation with a positive or negative resist.
提供了一种抗反射涂层形成组合物。这种组合物包括一种聚合物和一种溶剂。聚合物具有由式(1)表示的结构单元:
1
其中 R
1
是氢原子或一价基团以外的一价原子,n 是 0-4 的整数,但当 n 是 2-4 的整数时,R
1
的复数相同或不同;R
2
和 R
3
均为一价原子或基团;X 为二价基团。由这种组合物形成的抗反射涂层具有很高的抗反射效果,不会与抗蚀剂薄膜产生混杂,并且在与正极或负极抗蚀剂配合使用时,可以形成分辨率和精度极佳的抗蚀图案轮廓。