Asymmetric 9-(1′-naphthyl)fluorenes: enantioselective synthesis, determination of absolute configuration and retention of axial chirality in the fluorenyl carbanions
Asymmetric 9-(1′-naphthyl)fluorenes: enantioselective synthesis, determination of absolute configuration and retention of axial chirality in the fluorenyl carbanions
作者:Robert W. Baker、Trevor W. Hambley、Peter Turner
DOI:10.1039/c39950002509
日期:——
The rotamers of 1-methyl-9-[2â²-(methoxymethyl)-1â²-naphthyl]fluorene 10 and 11 were synthesised enantioselectively via ligand coupling reactions of 1-(alkyl or arylsulfinyl)naphthalene-2-carboxylate esters with 1-methylfluorenyllithium and the absolute configurations established by a single crystal X-ray study of the (1R)-menthyl ester 4; deprotonation of 10 and 11 affords fluorenyl carbanions, ent-12 and 12, respectively, which retain axial chirality.
Kineticresolution of racemic sulphoxides by chiralpoly[N-(1-phenylethyl)iminoalanes](PIA-PHETs) from (+)- or (–)-1-phenylethylamine is described. For p-tolyl mesityl sulphoxide in the temperature range between –25 and +85 °C, optical yields increase with temperature to an upper limit of between 55 and 70 °C, with enantiomeric enrichments up to ca. 75%. It is shown that, among the three molecular
RIDLEY D. N.; SMAL M. A., J. CHEM. SOC. CHEM. COMMUN., 1981, NO 11, 505-506
作者:RIDLEY D. N.、 SMAL M. A.
DOI:——
日期:——
Sensitized photochemical switching for cholesteric liquid crystal displays
申请人:Shukla Deepak
公开号:US20070243342A1
公开(公告)日:2007-10-18
The present invention relates to photo-tunable dopant compositions comprising a photo-reactive chiral compound capable of undergoing a photochemical reaction resulting in the loss of chirality, and a triplet sensitizer. The present invention also relates to a display comprising a substrate, a liquid crystalline layer thereon, wherein the liquid crystalline layer comprises a nematic host, at least one chiral dopant, a photo-reacted compound, and a triplet sensitizer, and at least one transparent conductive layer. The present invention also relates to a method of tuning a cholesteric liquid crystal material comprising providing at least one mesogenic compound, at least one triplet sensitizer, and at least one photo-reactive chiral compound; combining the at least one mesogenic compound, at least one triplet sensitizer, and at least one photo-reactive chiral compound to form a mixture; and irradiating the mixture for a period of time.
Sensitized Photochemical Switching for Cholesteric Liquid Crystal Displays
申请人:Shukla Deepak
公开号:US20100068418A1
公开(公告)日:2010-03-18
The present invention relates to photo-tunable dopant compositions comprising a photo-reactive chiral compound capable of undergoing a photochemical reaction resulting in the loss of chirality, and a triplet sensitizer. The present invention also relates to a display comprising a substrate, a liquid crystalline layer thereon, wherein the liquid crystalline layer comprises a nematic host, at least one chiral dopant, a photo-reacted compound, and a triplet sensitizer, and at least one transparent conductive layer. The present invention also relates to a method of tuning a cholesteric liquid crystal material comprising providing at least one mesogenic compound, at least one triplet sensitizer, and at least one photo-reactive chiral compound; combining the at least one mesogenic compound, at least one triplet sensitizer, and at least one photo-reactive chiral compound to form a mixture; and irradiating the mixture for a period of time.