Thermal rearrangement of 2-thiabicyclo[ 3.2.0]hepta-3,6-diene-6,7-dicarbonitriles 1-3 to their 4,5-dicarbonitrile isomers 4-6 takes place at 110-140 "C in yields of 82-84%. The reactions are first order with rates almost independent of the polarity of the solvent. Activation parameters (m = 120-140 kJ mol-' and AS* = 0 J K-l mol-') are in agreement with a concerted symmetry-allowed antarafacial...

A comprehensive mechanistic investigation was conducted on the coupling reaction of aryl sulfoxides with phenols by using trifluoroacetic anhydride to yield biaryls. NMR experiments revealed that our previously proposed mechanism, which consists a cascade an interrupted Pummerer and rate-determining [3,3] sigmatropic rearrangement, is reasonable. The electronic effects substrates were also eval...

A novel DNA rearrangement has been characterised that is both a direct and inverted repeat. This rearrangement involves the 2-fold duplication of a plasmid sequence adjacent to the site of insertion of a long palindrome. The sequence of this rearrangement suggests that it has arisen by strand slippage from the leading to the lagging strand of the replication fork as a consequence of the presenc...

Anaplastic lymphoma kinase (ALK) rearrangement is most commonly observed in lung adenocarcinoma in a subset of lung cancer. Large cell neuroendocrine carcinoma (LCNEC) harboring an ALK rearrangement is very rare. Based on the findings from a transbronchial lung biopsy, a 75-year-old non-smoking woman was diagnosed with LCNEC with multiple liver and bone metastases. After seven cycles of cytotox...

We studied the H-chain class switch rearrangement in four groups of clonally related B cell hybridomas, to test the hypothesis that class switch terminates somatic mutation in a B cell. Using switch region-specific probes in Southern blot analysis individual mu-gamma switch rearrangement events can be distinguished. We show that clonally related IgG-producing hybridomas that differ by mutations...

Fe3O4 nanoparticles were employment as an efficient and magnetically separable Nano catalyst for the synthesis of amides via one-pot Beckmann rearrangement of ketones under solvent-free conditions. Various secondary amides were synthesized by this method in moderate to good yields. The catalyst showed high thermal stability and was recovered and reused at least five times without any considerab...

The synthesis of a homologous series of transoid, bridged sym-oxepin oxides (loa-c) is described. The lower homologues, IOa,b, do not undergo facile Cope rearrangement to the sym-oxepin oxides 15a,b. The generation of transoid 1Oc led rapidly to the production of the Cope rearrangement product 15c. The differing reactivity in the series loa-c is attributed to the inability of lOa,b to interconv...