Phenylazophenol-quinone phenylhydrazone tautomerism in chromogenic cryptands and corands with inward-facing phenolic units and their acyclic analogs
摘要:
A series of 4-(4'-nitrophenol)azophenol compounds is prepared in which ether oxygen-containing substituents are attached at the 2- and 6-positions or connect the 2- and 6-positions to incorporate the chromophoric unit into corand or cryptand structures with inward-facing phenolic groups. The phenylazophenol-quinone phenylhydrazone tautomerism of these compounds, as probed by ultraviolet-visible spectroscopy, reveals a pronounced effect of the structure of the ether oxygen-containing substituents or bridging unit upon the tautomeric equilibrium. Chromogenic responses of five cryptands with inward-facing phenolic groups to sodium and potassium ions are determined and compared.
NOVEL TETRACARBOXYLIC DIANHYDRIDE, POLYIMIDE RESIN AND METHOD FOR PRODUCING THE SAME, PHOTOSENSITIVE RESIN COMPOSITIONS, PATTERNING PROCESS, METHOD FOR FORMING CURED FILM, INTERLAYER INSULATING FILM, SURFACE PROTECTIVE FILM, AND ELECTRONIC PARTS
申请人:SHIN-ETSU CHEMICAL CO., LTD.
公开号:US20190169211A1
公开(公告)日:2019-06-06
The present invention has been made in view of the circumstances herein. An object of the present invention is to provide: a tetracarboxylic dianhydride which can lead to a polyimide usable as a base resin of a photosensitive resin composition capable of forming a fine pattern and obtaining high resolution without impairing excellent characteristics such as mechanical strength and adhesiveness; a polyimide resin obtained by using the tetracarboxylic dianhydride; and a method for producing the polyimide resin. The tetracarboxylic dianhydride is shown by the following general formula (1).
Reactions of lithium aluminium hydride in hydrocarbon solvents. Selective demethylation of some substituted methyl phenyl ethers
作者:John F. Carroll、Sunanta Kulkowit、M. Anthony McKervey
DOI:10.1039/c39800000507
日期:——
Lithiumaluminiumhydride in benzene or heptane is an effective reagent for selectivedemethylation of methylphenylethers having additional ether functions in the immediate vicinity of the reaction site.
苯或庚烷中的氢化铝锂是一种有效的试剂,用于在反应位点附近使具有附加醚功能的甲基苯基醚选择性脱甲基。
CONTINUOUS PROCESS FOR CONVERSION OF LIGNIN TO USEFUL COMPOUNDS
申请人:Chemtex Italia, S.p.A.
公开号:US20130224816A1
公开(公告)日:2013-08-29
This specification discloses an operational continuous process to convert lignin as found in ligno-cellulosic biomass before or after converting at least some of the carbohydrates. The continuous process has been demonstrated to create a slurry comprised of lignin, raise the slurry comprised of lignin to ultra-high pressure, deoxygenate the lignin in a lignin conversion reactor over a catalyst which is not a fixed bed without producing char. The conversion products of the carbohydrates or lignin can be further processed into polyester intermediates for use in polyester preforms and bottles.
Provided are: a cured film-forming composition whereby a underlayer film for image formation formed from the composition exhibits high liquid repellency (lyophobicity) and lyophilic/liquid-repellent properties of the underlayer film can be easily changed even when exposed to a low amount of ultraviolet radiation; and a cured film obtained using the composition. The cured film-forming resin composition is characterized by containing: a polymer comprising a structural unit derived from a first monomer having the structure of formula (1) as component (A); a polymer other than component (A), which is a polymer in which the content of fluorine relative to the overall weight of the polymer is lower than in component (A), as component (B); a photoacid generator as component (C); and a solvent. (In the formula, R1 denotes hydrogen or a methyl group, and R2 denotes a fluorine-containing group able to be detached together with the oxygen atom bonded to R2.)
Tetracarboxylic dianhydride, polyimide resin and method for producing the same, photosensitive resin compositions, patterning process, method for forming cured film, interlayer insulating film, surface protective film, and electronic parts
申请人:SHIN-ETSU CHEMICAL CO., LTD.
公开号:US10919918B2
公开(公告)日:2021-02-16
An object of the present invention is to provide: a tetracarboxylic dianhydride which can lead to a polyimide usable as a base resin of a photosensitive resin composition capable of forming a fine pattern and obtaining high resolution without impairing excellent characteristics such as mechanical strength and adhesiveness; a polyimide resin obtained by using the tetracarboxylic dianhydride; and a method for producing the polyimide resin. The tetracarboxylic dianhydride is shown by the following general formula (1).