97203-71-9Relevant academic research and scientific papers
Photoinduced formation of an azobenzene-based CD-active supramolecular cyclic dimer
Sogawa, Hiromitsu,Terada, Kayo,Miyagi, Yu,Shiotsuki, Masashi,Inai, Yoshihito,Masuda, Toshio,Sanda, Fumio
, p. 6747 - 6755 (2015)
A series of new photo-responsive amino acid-derived azobenzenedicarboxylic acid derivatives (S)-a-e were synthesized. Compound (S)-a in the trans form exhibited no circular dichroism (CD) signal in DMF under ambient conditions, whereas intense Cotton effects were observed upon UV irradiation, indicating the formation of a chiral supramolecular structure in the cis form. The CD signals disappeared when trifluoroacetic acid (TFA) was added to the solution. The ester counterpart [(S)-a] showed no CD signal. Hydrogen bonding between the carboxy groups seemed necessary for constructing the supramolecular structure. The kinetic studies of cis to trans isomerization of (S)-a demonstrated that the formation of a chiral supramolecule enhances the stability of the cis-azobenzene structure. The ESI mass spectrum of stilbenedicarboxylic acid (S)-4, an analogue of (S)-b, confirmed the formation of a dimer. A theoretical CD study revealed that (S)-a in the cis form should be present as a cyclic chiral dimer.
SULFURIC ACID ESTERS OF SUGAR ALCOHOLS
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, (2008/06/13)
The present invention is concerned with novel sulfuric acid esters of sugar alcohols and sugar alcohol-like compounds of the formula STR1 Also described are methods for the treatment and/or prophylaxis of arteriosclerotic changes in the vascular wall as well as a process for the manufacture of the compounds of formula I and their salts.
