5047-02-9Relevant academic research and scientific papers
Macrolactones and crown ethers derived from biphenyl. Electronic and steric influence of substituents on its complexation ability
Costero, Ana M.,Andreu,Pitarch,Andreu
, p. 3683 - 3692 (1996)
Electronic effects as well as steric hindrance must be considered in order to compare the ability of macrolactones and crown ethers for complexing alkali cations and Hg(SCN)2.
Absolute Configuration Assignment from Optical Rotation Data by Means of Biphenyl Chiroptical Probes
Vergura, Stefania,Scafato, Patrizia,Belviso, Sandra,Superchi, Stefano
, p. 5682 - 5690 (2019/03/17)
A non-empirical approach for the assignment of the absolute configuration of chiral 2-alkyl-substituted carboxylic acids and primary amines by [α]D measurements has been developed. The method requires the conversion of the chiral acids or amines into the corresponding 4,4′-disubstituted biphenylamides or biphenylazepines, respectively. In these derivatives a central-to-axial chirality transfer induces a preferred torsion in the biphenyl moiety revealed by the sign of the biphenyl A band in the ECD spectrum. By 4,4′-substitution on the biphenyl moiety a redshift of the A band is obtained, leading to an increase of its relative contribution to optical rotation. This allows to reliably establish a direct correlation between the [α]D sign, the biphenyl twist and, then, the substrate absolute configuration. This approach thus constitutes a really practical and reliable method to assign the absolute configuration of chiral carboxylic acids and primary amines by simple and straightforward [α]D measurement, readily obtainable by a routine instrumentation like the polarimeter.
PHOTOALIGNING MATERIAL
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, (2013/03/26)
The present invention relates to a copolymer for the photoalignment of liquid crystals comprising a photoreactive group as given below in formula (I), compositions thereof, and its use for optical and electro optical devices, especially liquid crystal dev
PHOTOALIGNING MATERIALS
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, (2013/04/24)
The present invention relates to polymer, homo- or copolymer or oligomer for the photoalignment of liquid crystals, especially for the planar orientation of liquid crystals, comprising a main chain and a side chain, wherein the side chain and/or main chain comprises a polar group, compositions thereof, and its use for optical and electro optical devices, especially liquid crystal devices (LCDs).
PHOTOALIGNING MATERIALS
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, (2013/04/24)
The present invention relates to polymer, homo- or copolymer or oligomer, which, when irradiated with polarised light orients perpendicular to the polarization direction of polarized actinic light, for the photoalignment of liquid crystals, especially for the planar orientation of liquid crystals, and which derives from at least one monomer (I), compositions thereof, and its use for optical and electro optical devices, such as, liquid crystal devices (LCDs), especially for planar orientation of liquid crystals.
PHOTOCROSSLINKABLE MATERIALS COMPRISING ALICYCLIC GROUP
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Page/Page column 142-143, (2009/01/20)
A diamine compound of formula (I) is proposed as well as polymers, copolymers, polyamic acids, polyamic acid esters, or polyimides based on such compound.
