A general method is described for the preparation of N-unsubstituted azetidinones. The imine derived from p-anisidine and cinnamaldehyde is annelated with azidoacetic trifluoroacetic anhydride to yield the azetidinone 9. Treatment of 9 with ceric ammonium nitrate (CAN) yields the N-dearylated product 3. Similarly, treatment of the imine derived from p-anisidine and methyl glyoxylate methyl hemiacetal with N-phthalimidoacetyl chloride yields azetidinone 13. Derivatives of 13 at C-3 and C-4 when treated with 17, 19, and 21. Acylated derivatives of 3-aminomonobactamic acid (1) + 3 are efficacious antimicrobial agents for a variety of grampositive and negative bacteria.1 2345In particular, compound 2 (SQ 26 776) possesses a broad spectrum of gram-negative

This research presented the kinetic performance of arsenic absorption by mesostructure SBA-15 functionalized with Al2O3. The SBA-15 was previously synthesised and subsequently functionalized via impregnation of alumina oxides. The absorption of arsenic(V) was studied as a function of absorbent dosage and contact time. The experimental data were fitted to kinetic pseudo-first order, pseudo-second order and the intra-particle diffusion model. The pseudo-second order model presented the best correlation with the experimental data. Both surface absorption and intra-particle diffusion were acting during arsenic uptake, except for absorbent dosage of 0.1g, which was mainly controlled by the intra-particle diffusion.

The highly ordered mesoporous MCM-41 was synthesized and modified with various content of aluminum (0-15%) using an incipient wetness impregnation technique. The prepared Al modified MCM-41 materials were characterized by XRD, and explored as adsorbents for arsenic(V) removal. Al loading and calcination temperature played significant roles in the absorbents structures and adsorption capacities. The maximal arsenic(V) adsorption capacity of 16.3 mgAs/gAl was obtained when Al loading of 10 wt% and calcination temperature of 400 °C were used.

Aus den Iminen (V) und (VIII) des p‐Anisidins werden die N‐Aryl‐azetidinone (I) auf den im Formelschema angegebenen Wegen hergestellt.

This paper reports the adsorption of Cr(VI) ions from aqueous solution by organic-inorganic hybrid mesoporous material. Adsorbents were prepared with the DTAB,TTAB,CTAB and STAB for organic component synthesis organic-inorganic hybrid mesoporous material(HM), namely HMD, HMT, HMC and HMS. The best adsorption hexavalent chromium experimental conditions is obtained after having orthogonal experiment.