33 research outputs found
Î -Compression in [2.2]Paracyclophanes: Structural and Spectroscopical Effects in [2.2]Paracyclophane-1,9-diene Complexes
Tetraponerine-8, An Alkaloidal Contact Poison in a Neoguinean Pseudomyrmecine Ant, Tetraponera Sp
Solid-state Photochemical [2+2] Cycloaddition Reaction of Hydrogen-Bonded Zn(II) Metal Complex Containing Several Parallel C=C Bonds
Intramolecular [2 + 2] Photodimerization Achieved in the Solid State via Coordination-Driven Self-Assembly
An
intramolecular [2 + 2] photocycloaddition is achieved in the
organic solid state via self-assembly of AgÂ(I) ions and an <i>endo</i>-ditopic bipyridine. The cations aide to organize carbon–carbon
double (Cî—»C) bonds attached to the bipyridine for the cycloaddition
reaction. The Cî—»C bonds react regioselectively and quantitatively
to afford a photoproduct with edge-sharing four-, five-, and six-membered
rings. Our study demonstrates the first use of a metal–organic
template to direct an intramolecular [2 + 2] photodimerization in
the organic solid state
Detection of Proton Chemical Exchange between Metabolites and Water in Biological Tissues
A solid-state [2 + 2] photodimerization involving coordination of Ag(I) ions to 2-pyridyl groups
<p>Photoreactive Ag(I) complexes of <i>p</i>-toluenesulfonate ions with the unsymmetrical alkene <i>trans</i>-1-(4-acetoxyphenyl)-2-(2-pyridyl)ethylene <b>1</b> is reported. The crystal [Ag(<i>p</i>-tol)(<b>1</b>)<sub>2</sub>]•(H<sub>2</sub>O) (<i>p</i>-tol = <i>p</i>-toluenesulfonate) undergoes a [2 + 2] photocycloaddition reaction in quantitative yield to afford the head-to-tail (ht) photoproduct <i>rctt</i>-1,3-bis(2-pyridyl)-2,4-bis(4-acetoxyphenyl)cyclobutane <b>2</b> regioselectively. The aromatic rings of the olefin participate in face-to-face π–π interactions and adopt an anti-conformation to position the carbon–carbon double bonds (C = C) in a suitable orientation to undergo photoreaction between neighboring complexes.</p