钯介导的分子内芳基-芳基偶联反应被应用于生物活性天然产物石墨内酯 G ( 1 ) 和棕榈醇 A ( 2 ) 和 B ( 3 )的全合成,它们在 6 上具有不寻常的氯取代基。H- dibenzo[ b , d ]pyran-6-one 骨架。基于偶联反应的过渡态模型,还讨论了芳基-芳基偶联反应区域选择性的机理方面。 全尺寸图像
Depsidone synthesis. Part 16. Benzophenone–grisa-3′,5′-diene-2′,3-dione–depsidone interconversion: a new theory of depsidone biosynthesis
作者:Tony Sala、Melvyn V. Sargent
DOI:10.1039/p19810000855
日期:——
The synthesis of a number of grisa-3′,5′-diene-2′,3-diones by oxidative coupling of substituted 2,2′-dihydroxy-4-methoxybenzophenones is described. The rearrangement of these grisadienediones to depsidones under basic, acidic, and thermal conditions is described and the mechanisms of these reactions are discussed. It is proposed that depsidone biosynthesis involves the oxidative coupling of benzophenones
MODIFIER FOR AROMATIC POLYESTER AND AROMATIC POLYESTER RESIN COMPOSITION COMPRISING THE SAME
申请人:TABATA Masayoshi
公开号:US20110224343A1
公开(公告)日:2011-09-15
The present invention provides a modifier for aromatic polyesters which enhances the melt fluidity of aromatic polyesters without a significant decrease in the heat resistance of the aromatic polyesters, and an aromatic polyester resin composition including the modifier for aromatic polyesters. The present invention relates to a modifier for aromatic polyesters comprising polyhydric phenol residues and residues of aromatic polycarboxylic acid, acid halide or acid anhydride thereof, and the modifier comprises a material having a structure composed of a first residue selected from the group consisting of divalent residues represented by Formula (I): —Ar—W
1
x
—Ar— and by Formula (II): —Ar—, the first residues being bonded to two identical or different second residues selected from the group consisting of monovalent residues represented by Formula (III):
and monovalent residues represented by Formula (IV): —O—C(O)—R
7
—.
several chlorinated derivatives of norlichexanthone 6a by unambiguous methods are described. The 1H NMR spectra of these compounds are discussed and several structures previously assigned for lichenxanthones are questioned. The suggested revisions are summarized in Table 3.
描述了通过明确方法制备去甲己基己酮6a的几种氯化衍生物的方法。讨论了这些化合物的1 H NMR光谱,并对先前指定用于地衣chen吨的几种结构提出了质疑。表3总结了建议的修订。
METHOD FOR PRODUCING BIARYL COMPOUND
申请人:Sato Koichi
公开号:US20100087680A1
公开(公告)日:2010-04-08
A method for producing a biaryl compound, comprising reacting an aromatic organic compound with at least one compound selected from the group consisting of aromatic organoboron compounds and boroxine compounds, in the presence of a zero-valent nickel catalyst, phosphine ligand and base.
In Siebdruck verarbeitbare härtbare Zusammensetzung, ein gehärteter Überzug aus dieser Zusammensetzung und Verfahren zum Löten von Schaltkarten unter Verwendung dieser Zusammensetzung
申请人:International Business Machines
Corporation
公开号:EP0009190A1
公开(公告)日:1980-04-02
Die Erfindung betrifft eine im Siebdruck verarbeitete Zusammensetzung mit einem Gehalt an einem epoxidierten Novolak, einem Phenoxypolymeren, einem flüssigen Anhydrid, kolloidalem Siliciumdioxid und einem Verdünnungsmittel. Die Zusammensetzung wird zur Beschichtung von Unterlagen, beispielsweise von gedruckten Schaltkarten, verwendet und dient als Lötmaske und Schutzüberzug.