Search results

Search for "photochemistry" in Full Text gives 159 result(s) in Beilstein Journal of Organic Chemistry.

Photocycloaddition of aromatic and aliphatic aldehydes to isoxazoles: Cycloaddition reactivity and stability studies

  • Axel G. Griesbeck,
  • Marco Franke,
  • Jörg Neudörfl and
  • Hidehiro Kotaka

Beilstein J. Org. Chem. 2011, 7, 127–134, doi:10.3762/bjoc.7.18

Graphical Abstract
  • ; photochemistry; Introduction Photochemical [2 + 2] cycloadditions are among the most efficient photoreactions and are used in numerous synthetic applications due to the generation of highly reactive four-membered rings. An important example is the photocycloaddition of electronically excited carbonyl compounds
  • unstable. Photochemistry of the isoxazoles 7a–h: test reactions The isoxazoles 7a–e were irradiated in the presence of benzaldehyde or propionaldehyde as model compounds for aromatic and aliphatic carbonyl compounds, respectively, at λ = 300 nm in perdeuterated acetonitrile. 1H NMR studies showed that the
PDF
Album
Full Research Paper
Published 26 Jan 2011

Photocycloadditions and photorearrangements

  • Axel G. Griesbeck

Beilstein J. Org. Chem. 2011, 7, 111–112, doi:10.3762/bjoc.7.15

Graphical Abstract
  • shifts are known from carbonyl photochemistry, di-π-methane and oxa-di-π-methane rearrangements are processes that can occur with a remarkable increase in molecular and stereochemical complexity, as can meta arene photocycloadditions. It was a great pleasure to act as the editor of this Thematic Series
PDF
Video
Editorial
Published 26 Jan 2011

A new fluorescent chemosensor for fluoride anion based on a pyrrole–isoxazole derivative

  • Zhipei Yang,
  • Kai Zhang,
  • Fangbin Gong,
  • Shayu Li,
  • Jun Chen,
  • Jin Shi Ma,
  • Lyubov N. Sobenina,
  • Albina I. Mikhaleva,
  • Guoqiang Yang and
  • Boris A. Trofimov

Beilstein J. Org. Chem. 2011, 7, 46–52, doi:10.3762/bjoc.7.8

Graphical Abstract
  • Zhipei Yang Kai Zhang Fangbin Gong Shayu Li Jun Chen Jin Shi Ma Lyubov N. Sobenina Albina I. Mikhaleva Guoqiang Yang Boris A. Trofimov Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190
PDF
Album
Supp Info
Full Research Paper
Published 12 Jan 2011

Synthesis of spiroannulated and 3-arylated 1,2,4-trioxanes from mesitylol and methyl 4-hydroxytiglate by photooxygenation and peroxyacetalization

  • Axel G. Griesbeck,
  • Lars-Oliver Höinck and
  • Jörg M. Neudörfl

Beilstein J. Org. Chem. 2010, 6, No. 61, doi:10.3762/bjoc.6.61

Graphical Abstract
  • University of Cologne for a start-up grant. Biological testing was performed in South-Korea. AGG is recipient of the 2009 Honda-Fujishima award (Asian Photochemistry Association) for the antimalarial trioxane research.
PDF
Album
Full Research Paper
Published 07 Jun 2010

Anthracene functionalized terpyridines – synthesis and properties

  • Falk Wehmeier and
  • Jochen Mattay

Beilstein J. Org. Chem. 2010, 6, No. 54, doi:10.3762/bjoc.6.54

Graphical Abstract
  • (terpyridine)complexes 6a–b. Irradiation experiments were carried out with both the free ligands and an iron(II)-complex in order to investigate the photochemistry of the compounds. Keywords: anthracene; coordination chemistry; photochemistry; terpyridine; Introduction 2,2′:6′,2″-Terpyridines have been of
  • terpyridine derivatives in photochemistry, we focused our attention on the synthesis and studies of potentially photoswitchable terpyridine ligands. The synthesis of bisterpyridines linked by a diazogroup has been reported [7][8]. As well as the connection of terpyridines to spiropyran moieties [9] and
  • , and investigations regarding their photochemistry. Results and Discussion Synthesis of anthracene functionalized terpyridines We synthesized the terpyridine-4,4″-diacid 3, starting from methyl 2-acetylisonicotinate (1) and 4-tert-butylbenzaldehyde (2), by a one-pot combination of a Kröhnke type
PDF
Album
Supp Info
Full Research Paper
Published 27 May 2010
Graphical Abstract
  • photochemistry, we focused our attention on the synthesis and studies of photoswitchable terpyridine ligands. The synthesis of bisterpyridines linked by a diazogroup has been reported [7][8], as well as the connection of terpyridines to spiropyran moieties [9]. There have also been recent reports about
  • terpyridines linked to dithienylethenes [10][11]. Herein we report the synthesis of terpyridine functionalized diarylethenes based on perfluorocyclopentene, their photochemistry and investigations regarding the influence of transition metals. Results and Discussion Synthetic key steps The basic photochromic
PDF
Album
Supp Info
Full Research Paper
Published 26 May 2010

Synthesis of novel photochromic pyrans via palladium- mediated reactions

  • Christoph Böttcher,
  • Gehad Zeyat,
  • Saleh A. Ahmed,
  • Elisabeth Irran,
  • Thorben Cordes,
  • Cord Elsner,
  • Wolfgang Zinth and
  • Karola Rueck-Braun

Beilstein J. Org. Chem. 2009, 5, No. 25, doi:10.3762/bjoc.5.25

Graphical Abstract
  • starting material and product under the harsh reaction conditions. All attempts to use MeOH in THF under similar conditions failed to produce detectable amounts of the desired methyl ester. Photochemistry of benzopyrans: Compound 5a Photophysical properties of the novel pyrans are exemplified with compound
  • related systems [20]. The photochemistry of the investigated benzopyran 5a may be summarized as follows: as known from the literature [32], a very short-lived excited state is observed after photoexcitation into the S1-band, which decays on a time-scale < 1 ps. The molecule has reached the open form with
PDF
Album
Supp Info
Full Research Paper
Published 27 May 2009

Reversible intramolecular photocycloaddition of a bis(9-anthrylbutadienyl)paracyclophane – an inverse photochromic system. (Photoactive cyclophanes 5)

  • Henning Hopf,
  • Christian Beck,
  • Jean-Pierre Desvergne,
  • Henri Bouas-Laurent,
  • Peter G. Jones and
  • Ludger Ernst

Beilstein J. Org. Chem. 2009, 5, No. 20, doi:10.3762/bjoc.5.20

Graphical Abstract
  • photochemistry 3.1 Electronic absorption spectra The electronic absorption spectra of 2 in methylcyclohexane (MCH) and acetonitrile are represented in Figure 6. One notes that the lowest energy band (λmax = 400 nm with a tail down to 480 nm) is clearly red-shifted as compared to those of all the cinnamophane
PDF
Album
Supp Info
Full Research Paper
Published 07 May 2009

EcoScale, a semi- quantitative tool to select an organic preparation based on economical and ecological parameters

  • Koen Van Aken,
  • Lucjan Strekowski and
  • Luc Patiny

Beilstein J. Org. Chem. 2006, 2, No. 3, doi:10.1186/1860-5397-2-3

Graphical Abstract
  • , the application of unconventional techniques such as microwave irradiation, ultrasound or photochemistry, and the need for an inert atmosphere, especially in a glove box, downgrade the overall quality of the synthesis. 5. Temperature/time The reaction temperature and time are closely related. In an
PDF
Album
Full Research Paper
Published 03 Mar 2006
Other Beilstein-Institut Open Science Activities