We derive computable error estimates for finite element approximations to elliptic PDE with rough,stochastic coefficients.
Isoxazoline N-oxides have been regarded as an important class of building blocks for the construction of biologically active molecules[1] and complex natural products.
Apart from the well-known Michaelis-Arbuzov and Michaelis-Becker reactions,the phospha-Michael addition is probably one of the most important tools for P-C bond formation.
Five-membered nitrogen heterocycles are important substructures in a vast array of natural products and biologically interesting compounds.
A novel and mild method for the synthesis of a variety of fused polycyclic indole heterocycles has been developed.
Phenols are found in a variety of natural products,biologically active substances,pharmaceuticals and polymers.
Benzene derivatives,especially polysubstituted benzenes,represent privileged structural motifs in a myriad of bioactive natural products,pharmacologically interesting compounds and functional material
Phosphine-catalyzed Domino reactions1 with allenoates have emerged as a key tactics for the generation of molecular complexity.
Iridoids represent a large and still expanding group of cyclopentan[c]pyran monoterpenoids.
四唑作为富氮杂环化合物,在制药1、含能材料2、多孔材料3 以及燃料4 等方面具有广泛的研究及使用价值.然而,由于四唑二取代化合物具有1,5-二取代和2,5-二取代两种取代类型,在制备四唑高分子及其他四唑衍生物的过程中,常常会因四唑取代类型的不同而生成多种产物,为其分离纯化带来了很大的不便.