Halide exchanged Hoveyda-type complexes in olefin metathesis

• Julia Wappel,
• César A. Urbina-Blanco,
• Mudassar Abbas,
• Jörg H. Albering,
• Robert Saf,
• Steven P. Nolan and
• Christian Slugovc

Beilstein J. Org. Chem. 2010, 6, 1091–1098, doi:10.3762/bjoc.6.125

• necessary to obtain 2 or 3 in 90–92% yield and 95–98 % purity. Efforts to further shift the equilibrium towards 2 or 3 have so far proved unsuccessful. The impurity, which could not be separated by recrystallisation or column chromatography, was identified as the “mixed halogen” compound and as revealed by

Synthesis of bis(3-{[2-(allyloxy)ethoxy]methyl}-2,4,6-trimethylbenzoyl)(phenyl)phosphine oxide – a tailor-made photoinitiator for dental adhesives

• Norbert Moszner,
• Iris Lamparth,
• Jörg Angermann,
• Urs Karl Fischer,
• Frank Zeuner,
• Thorsten Bock,
• Robert Liska and
• Volker Rheinberger

Beilstein J. Org. Chem. 2010, 6, No. 26, doi:10.3762/bjoc.6.26

• with a molecular weight of 867 g/mol (Scheme 5) was formed in all cases as the main impurity in amounts of 0.5–5%. The structure of this compound was also clearly confirmed by the 13C and 1H NMR spectroscopic measurements of a WBAPO sample that specifically contained about 70% of this side product. The

• of 2 under formation of 4. Synthesis of WBAPO starting from P,P-dichlorophenylphosphine and 2. Structure of the main impurity in isolated WBAPO. Shear bond strength (SBS, MPa) on dentin of experimental aqueous SEAsa measured after storage of different SEAs at 42 °C.

Mitomycins syntheses: a recent update

• Jean-Christophe Andrez

Beilstein J. Org. Chem. 2009, 5, No. 33, doi:10.3762/bjoc.5.33

8-epi-Salvinorin B: crystal structure and affinity at the κ opioid receptor

• Thomas A. Munro,
• Katharine K. Duncan,
• Richard J. Staples,
• Wei Xu,
• Lee-Yuan Liu-Chen,
• Cécile Béguin,
• William A. Carlezon Jr. and
• Bruce M. Cohen

Beilstein J. Org. Chem. 2007, 3, No. 1, doi:10.1186/1860-5397-3-1

• apparent above baseline noise. We separated 4a and 4b with difficulty by repeated chromatography in EtOAc/hexanes. The sample of 4a contained traces of an inseparable impurity, which if active might artificially elevate the apparent binding affinity. Since the sample showed no affinity, however, this