Synthesis of mesogenic phthalocyanine-C₆₀ donor–acceptor dyads designed for molecular heterojunction photovoltaic devices

• Yves Henri Geerts,
• Olivier Debever,
• Claire Amato and
• Sergey Sergeyev

Beilstein J. Org. Chem. 2009, 5, No. 49, doi:10.3762/bjoc.5.49

• moiety was chosen to facilitate the chromatographic separation of the unsymmetrical phthalocyanines 10a–d from the major side product 3: the latter bears only relatively apolar, bulky swallow-tail alkoxy groups. In addition, the signal of the terminal methyl group of the MEM moiety serves as a convenient

Synthesis of phosphonate and phostone analogues of ribose-1-phosphates

• Pitak Nasomjai,
• David O'Hagan and
• Alexandra M. Z. Slawin

Beilstein J. Org. Chem. 2009, 5, No. 37, doi:10.3762/bjoc.5.37

• conventional chromatography. Due to the inability to separate α−18 from β−18, route B (Scheme 3) was explored as an alternative. Following the protocol demonstrated by Meyer et al. [4], 5-O-trityl-phosphonates 21a and 21b were obtained as individual epimers after chromatographic separation of the initial

Dimerization of propargyl and homopropargyl 6-azido- 6-deoxy- glycosides upon 1,3-dipolar cycloaddition

• Nikolas Pietrzik,
• Daniel Schmollinger and
• Thomas Ziegler

Beilstein J. Org. Chem. 2008, 4, No. 30, doi:10.3762/bjoc.4.30

• by acetylation of the intermediate glycosides and chromatographic separation of the anomeric acetates. Next, glycosides 4a–g were submitted to dimerization by 1,3-dipolar cycloaddition reaction. As the catalyst, 10 mol% (EtO)3PCuI was applied and used along with three equivalents diisopropyl