Fourier transform-Raman spectroscopy using pulsed lasers—II

This paper compares and contrasts two signal processing schemes, viz. the fast filter and the gated integrator. It is shown that the use of a gated integrator further increases the SNR advantage over CW excitation, and extends the use of pulsed excitation to allow the recording of Raman spectra samples at significantly higher temperatures. The use of a ratioing circuit to correct for laser pulse-to-pulse energy fluctuations is also demonstrated.     

Friedel—Crafts alkylations of ferrocene with unsaturated lactones. Some unusual reactions caused by the β-ferrocenylcarbenium ion

Friedel—Crafts alkylations of ferrocene with 5- and 6-membered unsaturated lactones have been studied. The expected alkylation products were isolated in the case of 5-membered lactones, while several products such as unsaturated ferrocenyl-lactones, ferrocenyldiketones as well as ferrocenylhydroxylactones were isolated in the case of 6-membered lactones. β-Ferrocenylcarbenium ion was suggested to be the key intermediate in this case.     

A comparative investigation of the photoinitiation process in bulk and micelle polymerisation: Part I—Steady state experiments

Benzophenone and a benzoin derivative were used to initiate under UV light excitation the polymerisation of acrylic and methacrylic monomers in bulk, in solution and in microheterogeneous medium. Rates of polymerisation, DP, polydispersity, quantum yields, effect of a magnetic field, and activation energies were determined. The results are discussed as a function of the chemical nature of the monomer and the initiator. A schematic picture for the initiation process of the photopolymerisation in micelle is proposed.