To provide a novel diamine, and a polyimide precursor and a polyimide using it. A diamine represented by the formula (1):
wherein each of X
1
and X
5
which are independent of each other, is a single bond or the like; each of X
2
and X
4
which are independent of each other, is —CH
2
— or the like; X
3
is a C
1-6
alkylene or the like; each of Y
1
and Y
2
which are independent of each other, is a single bond or the like; R is a C
1-20
linear, branched or cyclic hydrocarbon group; and a is 0 or 1).
Linear and branched polymers bearing S-(2-benzoxazolyl) thioester groups were selectively synthesized by free radical and photoinitiated radical polymerization, respectively, of S-(2-benzoxazolyl)-4-vinylthiobenzoate. Upon heating, the pendant S-(2-benzoxazolyl) thioester groups were converted to 3-acylbenzoxazoline-2-thione groups, accompanied with a change of refractive index (Δn) of about +0.01 in both cases. The structural conversion was confirmed by UV–vis and IR spectroscopy, as well as comparison with authentic polymers bearing 3-acylbenzoxazoline-2-thione groups (similarly synthesized from 3-(4-vinylbenzoyl)benzoxazoline-2-thione). Application of such thermally induced rearrangement reactions may provide a new approach for obtaining materials whose refractive index can be changed by heat (e.g., generated by a laser beam).
Synthesis of Aliphatic Polyamide Dendrimers Based on Facile Convergent Method
作者:Yumiko Ito、Tomoya Higashihara、Mitsuru Ueda
DOI:10.1021/ma300735w
日期:2012.5.22
A novel and rapid approach for the synthesis of aliphatic polyamide dendrimers, consisting of the 3,4-dialkoxyhydrocinnamamide structure as a repeating unit, has been developed. Aliphatic polyamide dendrons and dendrimers were easily prepared by a convergent approach involving activation of a carboxylic acid at the focal point using (2,3-dihydro-2-thioxo-3-benzoxazolyl)phosphonate (DBOP) as the activating
INTERMEDIATE COMPOUND FOR SYNTHESIZING PHARMACEUTICAL AGENT AND PRODUCTION METHOD THEREOF
申请人:OKUYAMA Masahiro
公开号:US20110251385A1
公开(公告)日:2011-10-13
The present invention relates to a production method of an optically active morpholine compound represented by the formula 10, which includes the following steps:
wherein each symbol is as defined in the specification.
The present invention also relates to a production method of an compound represented by the formula 55, which includes the following steps:
wherein each symbol is as defined in the specification.
According to the production method of the present invention, an optically active 2-aryl-substituted morpholine compound and 3-oxo-3-(pyrimidin-4-yl)propionate, which are important as starting materials for synthesizing 2-(2-arylmorpholin-4-yl)-1-methyl-1H-[4,4′]bipyrimidinyl-6-one having a tau protein kinase 1 inhibitory activity and useful as a therapeutic drug for Alzheimer's disease and the like, can be produced in a high yield by an industrially advantageous method.
LIQUID CRYSTAL ALIGNING AGENT CONTAINING POLYIMIDE PRECURSOR HAVING THERMALLY-LEAVING GROUP AND/OR POLYIMIDE
申请人:NISSAN CHEMICAL INDUSTRIES, LTD.
公开号:US20160264867A1
公开(公告)日:2016-09-15
To provide a liquid crystal aligning agent to obtain a liquid crystal alignment film which is excellent in the adhesion to a sealing agent and a substrate of a liquid crystal display device, and of which a decomposed product formed after irradiation with ultraviolet rays will easily be removed.
A liquid crystal aligning agent containing at least one polymer selected from the group consisting of a polyimide precursor having a bond represented by the following formula (1) in its main chain and an imidized polymer of the polyimide precursor:
wherein each of R
1
, R
2
, R
3
and R
4
which are independent of one another, is a hydrogen atom or a C
1-20
monovalent hydrocarbon group which may have a substituent, and D is a protecting group to be replaced with a hydrogen atom by heat.