Chiral-Boron-Complex Catalyzed Asymmetric Inverse-Electron-Demand Aza-Diels-Alder Reaction of β-Trifluoromethyl α,β-Unsaturated Ketones with Cyclic -Sulfonyl Ketimines.

A highly efficient asymmetric inverse-electron-demand aza-Diels-Alder reaction of β-trifluoromethyl α,β-unsaturated ketone with cyclic -sulfonyl ketimines catalyzed by ()-3,3'-I-BINOL-boron-complex was developed. A broad range of fused piperidine derivatives bearing stereogenic carbon containing CF motifs were prepared in high yields with excellent diastereo- and enantioselectivities (up to >20:1 dr, and >99% ee). This protocol had the characteristics of mild reaction conditions, high efficiency, and high stereoselectivity.

[Study on removal of di-(2-ethylhcxyl) phthalate by using of small-scale biological aerated filter].

Ceramsite medium biological aerated filter (BAF) was used to treat the sewage containing di-(2-ethylhcxyl) phthalate (DEHP). The treatment efficiency under different empty bed contact time (EBCT) and temperatures was investigated and the major intermediate products of biodegradation of DEHP were analyzed via GC-MS. Results show that the removal rate of DEHP can be highly achieved at 90.