Reversible handedness inversion is achieved in self-organized helical superstructures using a visible-light-driven macrocyclic chiral switch, as reported by Quan Li and co-workers their Research Article (e202216600). Green blue light can drive the reversible switching between left- right-handedness via cis/trans photoisomerization of azobenzene within cyclic molecular switch.

Journal of the American Chemical Society is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Communication Arginine52 Controls the Photoisomerization Process in Photoactive Yellow Protein Gerrit Groenhof, Lars V. Schfer, Martial Boggio-Pasqua, Helmut Grubmller, and Michael A. Robb J. Am. Chem. Soc., 2008, 130 (11), 3250-3251• DOI: 10.1021/ja078024u • ...

The cyclization of trans-δ-hydroxy enones to cyclic mixed ketals routinely requires superstoichiometric strong acid. By operating under a photoisomerization regime, the cyclization of trans-δ-hydroxy enones proceeds under catalytic Brønsted acid to provide cyclic ketals or unsaturated spiroketals in a highly diastereoselective fashion. A one-pot, two-step protocol was thus developed to provide ...

Enantiodifferentiating photoisomerization of (Z)-cyclooctene sensitized by (R)- or (S)-1-methylheptyl benzoate immobilized in zeolite supercages afforded the respective enantiomer pair, (-)- and (+)-(E)-isomer (1E) in 5% enantiomeric excess, whilst racemic 1E was obtained upon homogeneous-phase photosensitization with the same antipodal sensitizer pair, thus demonstrating for the first time tha...

The photolysis at 222 nm of 5-methyltetrazole isolated in a cryogenic argon matrix leads to formation of methyl nitrile imine as primary product. Subsequent irradiation at 328 nm induces transformation of the nitrile imine into 4π-electron three-membered-ring 3-methyl-1H-diazirine, which photorearranges to give methyl carbodiimide. These products were characterized by IR spectroscopy and theore...

Monomolecular films of 9-cis, 11-c/5, 13-cis and all-trans retinal were formed at an air-water interface. Area/molecule and surface potential were measured before, during and after illumina­ tion. The initial quantum yield of the photoisomerization o f 9-cis retinal was 0.25. Irradiation of a retinal monolayer resulted in 30 to 60 m Volt changes in surface potential. Complexation of retinals wi...