Late transition metal catalysts for olefin polymerization and oligomerization
申请人:Cherkasov Kuzunich Vladimir
公开号:US20060047094A1
公开(公告)日:2006-03-02
This invention relates to a transition metal compound represented by the formula LMX wherein M is a Group 3 to 11 metal L is a bulky bidentate or tridentate neutral ligand that is bonded to M by two or three heteroatoms and at least one heteroatom is nitrogen; X is a substituted or unsubstituted catecholate ligand provided that the substituted catecholate ligand does not contain a 1,2-diketone functionality.
Octasubstituted flavones from Ageratum houstonianum
作者:Leovigildo Quijano、José S. Calderón、Federico Gómez G、Edgar Escobar、Tirso Rios
DOI:10.1016/s0031-9422(00)83188-x
日期:1985.1
Abstract Two new highly oxygenated flavones, were isolated from aerial parts of Ageratumhoustonianum. Their structures were established as 3′-hydroxy-5,6,7,8,2′,4′,5′-heptamethoxyflavone and 5,3′-dihydroxy-6,7,8,2′,4′,5′-hexamethoxyflavone on the basis of spectral data and chemical degradation. The structure of the latter compound was confirmed by X-ray analysis.
摘要 从 Ageratum houstonianum 地上部分分离得到两种新的高氧黄酮。它们的结构被确定为 3'-羟基-5,6,7,8,2',4',5'-七甲氧基黄酮和 5,3'-二羟基-6,7,8,2',4',5' -六甲氧基黄酮基于光谱数据和化学降解。后一种化合物的结构通过 X 射线分析得到证实。