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The direct three-component aza-Diels–Alder reaction was conducted with lipase as a catalyst for the first time. Under the optimized conditions, the aza-Diels–Alder reaction catalyzed by lipase from Candida sp. 99–125 provided the products in moderate to excellent yields. Meanwhile, the endo/exo ratio reached up to 88:12.
A novel ferrite composite using rice husk as substrate has been prepared via high temperature treatment under nitrogen atmosphere. The rice husk substrate consists of porous activated carbon and silica, where spinel ferrite particles with average diameter of 59nm are distributed. The surface area of the composite is greater than 170m 2 g −1 and the bulk density is less than 0.6gcm...
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