Photoreactivite de systemes hexatrieniques heterocycliques. Aryl-2 et 3 benzo[b]thiophene

The photochemical behavior of several benzo[b]thiophenes 1–4 in neutral solutions or in the presence of primary and tertiary amines has been examined. In most cases, the photoformation of adducts or dimers, rather than cyclisation, has been observed. An unusual photocyclisation of a saturated compound 12 obtained by photolysis of 3 in a primary amine was observed     

Benzoindolizine derivatives of N-acylphenothiazine. Synthesis and characterization

A variety of unsaturated or partly and differentially saturated benzoindolizine derivatives of N-acylphenothiazine 1-3 has been efficiently synthesized by cyclocondensation of acetylenic or olefinic dipolarophiles with azomethineylide 4 derived from N-acetylisoquinolinium salt 5 flanking a phenothiazine unit.     

Neutralino contribution to the mass difference ofB_d^0 - \bar B_d^0

We present a detailed and complete calculation of the neutralino contribution to the mass difference Δm _{B d} ⁰ /m _{B d} ⁰ within the MSSM. We include the complete mixing matrices of the neutralinos and of the scalar partners of the left and right handed bottom quark. We find that the neutralino contribution is generally small but can be of the same order of the chargino contribution and much larger than that of the gluino over a small range ofm _S , givenm _{g 2} andμ and for tanβ～50.