Pyrrolesannulated with polycyclicaromaticcompounds, which are expected to be good precursormolecules for lowbandgappolymers, are prepared by the reaction of aromatic nitro compounds with ethyl isocyanoacetate and the subsequent deethoxycarbonylation.
aromatics such as nitrobenzene or nitronaphthalenes and give the corresponding pyrroles in good yields. Pyrroles prepared by this method have been converted into porphyrins fused with various aromatic rings by the reduction with LiAlH4 followed by treatment with an acid catalyst and oxidation with chloranil or oxygen. Tetra-1,2-naphthoporphyrin has been prepared by the reaction of 2-nitro-3,4-dihydronaphthalene
Versatile “3 + 1” syntheses of acenaphthoporphyrins, a new family of highly conjugated tetrapyrroles
作者:Pushpa Chandrasekar、Timothy D. Lash
DOI:10.1016/0040-4039(96)00998-7
日期:1996.7
Acenaphthoporphyrins, a new group of porphyrins with strongly red shifted electronic absorption spectra, have been prepared by the acid catalysed condensation of a pyrrole-2,5-dicarboxaldehyde with acenaphthotripyrranes; similarly, c-annelated pyrroledialdehydes afforded the related opp-diacenaphthoporphyrins and a mixed porphyrin system with fused phenanthrene and acenaphthylene rings.
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。
Synthesis of Tetraphenyltetraacenaphthoporphyrin: A New Highly Conjugated Porphyrin System with Remarkably Red-Shifted Electronic Absorption Spectra