Riemann流形上的抛物型Monge-Ampère方程

This paper deals with a class of parabolic Monge-Ampère equation on Riemannian manifolds. The existence and uniqueness of the solution to the first initial-boundary value problem for the equation are established.     

Thorocene adducts of the neutral 2,2′-bipyridine and its radical anion. Synthesis and crystal structures of [Th(η8-C8H8)2(κ2-bipy)] and [Th(μ-η8:η5-C8H8)2(κ2-bipy)K(py)2]∞

Thorocene [Th(Cot)₂] (Cot = η⁸-C₈H₈) readily reacts with 2,2′-bipyridine to give [Th(Cot)₂(κ²-bipy)], which has an unusual bent geometry. This compound is rapidly reduced by KC₈ into the anionic derivative [(Th(Cot)₂(κ²-bipy)]⁻. X-ray diffraction studies suggest the latter to be a Th(IV) compound with the bipyridyl radical anion. These complexes are rare examples of bent actinocene [An(Cot)₂(L)]^q− (q = 0, 1; An = actinide) and bipyridine-containing thorium species.     

A Novel One-Pot Synthesis of Polyfunctionally Substituted Thiopyrano(2,3- b )pyridine and Pyrido(2,3- b )pyridine Derivatives under Solid-Liquid Phase-Transfer Catalysis

Ketoketene thioacetals or cyanoketene thioacetals which were formed by treatment of a variety of active methylenes containing f -keto or f -cyano group with CS 2 or with PhNCS were allowed to react with 2-aminoprop-1-ene-1,1,3-tricarbonitrile under PTC conditions to afford thiopyrano(2,3- b )pyridine 3a-12a or pyrido(2,3- b )pyridine 3b-12b derivatives.