PYRANOQUINAZOLINE DERIVATIVES AND NAPHTHOPYRAN DERIVATIVES
申请人:KANTO KAGAKU KABUSHIKI KAISHA
公开号:US20200131193A1
公开(公告)日:2020-04-30
[Problem] A problem is presented in that conventional photochromic compounds cannot be considered adequate in terms of the colorizing/decolorizing rate and durability, and the production process therefore has many steps. The present invention provides an industrially applicable photochromic compound that has both a rapid colorizing/decolorizing reaction and high durability and can also be synthesized at a low cost.
[Solution] This compound is characterized in that etheric oxygen atoms are bonded to the carbon atoms at position 1 of a pyranoquinazoline (8H-pyrano[3,2-f]quinazoline) skeleton and position 10 of a naphthopyran (3H-naphtho[2,1-b]pyran) skeleton, said compound having photochromic properties and being a photochromic compound that has both a rapid colorizing/decolorizing reaction and high durability. Also provided is an industrially applicable photochromic compound that can be synthesized at a low cost.
are well-known photochromic molecules that undergo photochemical ring-opening reactions to form two colored open-ring isomers, the transoid-cis and transoid-trans forms, upon light irradiation. Though the transoid-cis form returns thermally to the uncolored closed form, the fading rate of the transoid-trans form is extremely slow because of its higher thermal stability. This slow fading behavior of the
Stepwise photochromism of bisnaphthopyrans exhibiting an excitation intensity-dependent color change
作者:Yuki Inagaki、Katsuya Mutoh、Jiro Abe
DOI:10.1039/c8pp00205c
日期:2018.7
Biphotochromic systems composed of two fast photochromicunits have the potential to show a stepwise two-photon absorption process in which the optical properties can be non-linearly controlled by changing the excitation light conditions. Herein, we designed and synthesized novel bisnaphthopyran derivatives containing fast photoswitchable naphthopyranunits. The bisnaphthopyran derivatives show a stepwise
Novel solid-phase synthesis of 2,6-disubstituted 4(3H)-quinazolinones for combinatorial library generation
作者:Csaba Wéber、Attila Bielik、Györgyi I Szendrei、István Greiner
DOI:10.1016/s0040-4039(02)00419-7
日期:2002.4
A novel procedure for the synthesis of 6-alkoxy-2-amino-4(3H)-quinazolinones from 2,4-dichloro-6-hydroxyquinazoline, amines and alcohols using Wang resin is described.