28150-13-2

Upstream product

• 1949-51-5 3,5-diaminobenzoic acid ethyl ester 
• 71022-43-0 3,5-dinitrobenzyl alcohol 
• 145691-59-4 (3,5-dibromophenyl)methanol 
• 99-34-3 3,5-dinitrobenzoic acid 
• 535-87-5 3.5-diaminobenzoic acid 

Downstream Products

• 253277-66-6 [3-amino-5-(4-fluoro-acridin-9-ylamino)-phenyl]-methanol 
• 207745-86-6 di-tert-butyl 5-(hydroxymethyl)-1,3-phenylene dicarbamate 
• 1413947-98-4 [3-tert-butoxycarbonyl amino-5-(3-hydroxy-propyl)-phenyl]-carbamic acid tert-butyl ester 

Relevant academic research and scientific papers

Dinitreno pentaradicals: organic sextet molecules

A new sextet ground state molecule, the 2,4,6-trichloro-1,3-dinitrenophenoxyl radical, was obtained upon UV photolysis of the corresponding diazido precursor in argon at 5 K. The sextet molecule is formed stepwise with the triplet nitrene, the quartet nitreno radical, and the quintet dinitrene as intermediates that were detected by EPR spectroscopy. IR and UV–Vis measurements only allowed us to observe the main product, the quintet dinitrene. The coupling between the two nitrene centers and the oxygen centered radical in the sextet state results in zero-field splitting (zfs) parameters of |D/hc| = 0.088 cm?1 and |E/hc| = 0.009 cm?1, considerably larger than in previously reported organic sextet molecules. An analogous sextet dinitrene formed by replacing the oxygen centered radical by a carbon centered radical was also studied by EPR spectroscopy, and in this case the zfs parameters |D/hc| = 0.125 cm?1 and |E/hc| = 0.023 cm?1 indicate even larger spin localization. Copyright

Amine compound and process for preparation thereof, liquid crystal aligning, liquid crystal alignment film, the liquid crystal display element (by machine translation)

The present invention relates to an amine compound, a method for preparing same, and a liquid crystal alignment agent, a liquid crystal alignment film, and a liquid crystal display device, having same. A liquid crystal alignment agent having polyamic acid or polyimide prepared using the amine compound of the present invention enables a liquid crystal alignment film and a liquid crystal display device having excellent thermal stability even after forming the liquid crystal alignment film, and expressing high alignment and stability even after an ultraviolet ray irradiation.

Diamination of phenylene dihalides catalyzed by a dicopper complex

Diamination of phenylene dihalides with aqueous ammonia to give the corresponding phenylenediamines can be achieved by using a dicopper complex [Cu2(bpnp)(OH)(CF3COO)3] (1) (bpnp = 2,7-bis(pyridine-2-yl)-l,8-naphthyridine) as the catalyst in the presence of Bu4NBr and Cs2CO3 in high yields. In addition, 1,3,5-tribromobenzene was converted into benzenetriamine quantitatively under the same conditions. This method offers a new opportunity, particularly simplifying steps and increasing yields, for the preparation of aryl diamines.

AROMATIC DIAMINES WITH A PHOTOREACTIVE AROMATIC SIDE GROUP, POLYAMIC ACID PHOTO-ALIGNMENT LAYERS WITH THEM AND METHOD FOR PREPARING LIQUID CRYSTAL CELLS

The present invention relates to photo-alignment layers from polyamic acid with a photoreactive aromatic side group. More specifically, the present invention relates to novel polyamic acid photo-alignment layers prepared by the solution polymerization of acid dianhydrides which comprises alicyclic acid dianhydrides at certain ratio or more and aromatic diamines which comprises aromatic diamines with a photoreactive aromatic side group at certain ratio or more and the preparation method thereof, and the preparation method of aromatic diamines with novel aromatic side group. Said polyamic acid photo-alignment layers provide excellent heat- resistance, surface hardness, transparency and liquid crystal alignment property for polarized UV light.

Contrast media

The invention provides low viscosity iodinated aryl compounds, useful as X-ray contrast agents of formula I wherein n is 0 or 1, and where n is 1 each C6R5moiety may be the same or different; X denotes a bond or a group providing a 1

Iodinated x-ray contrast media

The invention provides low viscosity iodinated aryl compounds, useful as X-ray contrast agents, of formula C6R6wherein three non-adjacent R groups are iodine and the remaining R groups are non-ionic, hydrophilic moieties, said compou

Contrast media

The invention provides low viscosity iodinated aryl compounds, useful as X-ray contrast agents, of formula I STR1 (wherein n is 0 or 1, and where n is 1 each C6 R5 moeity may be the same or different; each group R is a hydrogen atom,

Contrast media

The invention provides low viscosity iodinated aryl compounds, useful as X-ray contrast agents, of formula I STR1 (wherein n is 0 or 1, and where n is 1 each C6 R5 moeity may be the same or different; each group R is a hydrogen atom,