Photochemistry of α-carbonylferrocenes and related compounds

Abstract

Benzoylferrocene photoreacts with water in scopy ; a variety of other or-carbonylferrocenes are photoreactive in these solvent systems to give products which solvents such as dimethyl sulphoxide and pyridine to yield cyclopentadienyliron benzoate and free cyclo-may also contain carboxylate groups. pentadiene identified by Lr., u.v., and n.m.r. spectro-

Production of Raw and Ligand‐modified Silica Monolith Particles in an Enhanced Scale and their Application in High Performance Liquid Chromatography

“…According to Figure and Table , the average pore size of silica monolith particles decreased from 319 to 244 Å after chemical modification with C18 ligand. The decrease in pore size of silica particles after C18 modification in current study is almost close to that of the previous study (from 296 to 216 Å) …”

“…The BET specific surface area of current silica particles was 114 m 2 /g, a little less than that of the previous study (126 m 2 /g). As the specific surface area is inversely proportional to pore size, similarly the pore sizes of current and previous particles were 319 and 296 Å, respectively, as given in Table .…”

“…The surface of C18‐bound silica particles (Figure (e) and (f)) was much smoother than that of bare silica monolith particles (Figure (b) and (c)). The surface of C18‐bound silica monolith particles looks rougher than that of polystyrene bound silica monolith particles because the polystyrene ligand makes a film on the surface of silica monolith particles while the C18 ligand attaches to the surface of particles in the form of alkyl chain.…”

“…The preparation scale of silica monolith particles in this study was increased to 80–85 g/batch while the batches of the previous studies were on a much smaller scale. The original formulations of the previous studies and current study are comparatively assembled in Table together with the proportionally converted formulations to match the amount of TMOS to that of current study (200 mL).…”

“…The ground silica monolith particles have shown relatively higher separation efficiency than spherical porous silica particles, while the production cost is less than that of conventional silica particles and the method of preparation is simple . The partially sub‐2 µm porous silica monolith particles showed the best performance among the particles of wide scope. The particle size decreased primarily with a decrease of TMOS in the reaction mixture and secondarily with an increase of PEG and urea.…”