Identikits

Philip Terry translates Michele Metail’s collection of assemblage descriptions of people using ready-made language, which are referred to as “Portrait Robot”, a reference to an invention in 1950 in France of the Identifit or Photofit Picture used by police and the judiciary to reconstitute a broad outline of a suspect’s face

New reactions of N-tert-butylimines; formation of N-heterocycles by methyl radical elimination on flash vacuum thermolysis of N-benzylidene- and N-(2-pyridyl-methylidene)-tert-butylamines

Thermal reactions of N-benzylidene- and N-(2-pyridylmethylidene)-tert- butylamines (5 and 13) under FVT conditions have been investigated. Unexpectedly, at 800 °C, compound 5 yields 1,2-dimethylindole and 3-methylisoquinoline. In the reaction of 13 at 800 °C, 3-methylimidazo[1,5- a]pyridine was obtained as the major product. Mechanisms of these reactions have been proposed on the basis of DFT calculations. Furthermore, UV-photoelectron spectroscopy combined with FVT has been applied for direct monitoring and characterization of the thermolysis products in situ. Copyrigh

Electronic Structure of 1,2-Dihydro[1,3,2]diazaborolo[1,5-a]pyridine in Comparison with the Parent Isoindole

Chrostowska A, Maziere A, Dargelos A, et al. Electronic Structure of 1,2-Dihydro[1,3,2]diazaborolo[1,5-a]pyridine in Comparison with the Parent Isoindole. European Journal Of Inorganic Chemistry. 2013;2013(33):5672-5678.Gas-phase He-I photoelectron spectra of N-tert-butyl-1,2-dihydro[1,3,2]diazaborolo[1,5-a]pyridine (3) and its thermolysis product, the parent compound 1, have been recorded and assessed by density functional theory calculations. Similarly, N-tert-butylisoindole (4) and the parent isoindole (2) were also studied. The first ionization energies of these compounds increase in the series 3 (6.75 eV)< 1 (6.85 eV)< 4 (6.9 eV)< 2 (7.3 eV). Interestingly, the HOMOs of 1 and 3 are destabilized with respect to the first ionization energy of the isomeric 1,3,2-benzodiazaboroles (ca. 7.3 eV). The dipole moment of the ground state of isoindole derivative 4 (3.48 D) is significantly greater than that of 1,2-dihydro[1,3,2]diazaborolo[1,5-a]pyridine (3; 0.996 D). Upon electronic excitation, the dipole moments increased to 5.945 and 4.735 D for 4 and 3, respectively