Neighboring group participation in Lewis acid-promoted [3 + 4] and [3 + 5] annulations. The synthesis of oxabicyclo[3.n.1]alkan-3-ones
作者:Gary A. Molander、Kimberly O. Cameron
DOI:10.1021/ja00056a002
日期:1993.2
2-(alkoxycarbon)-m-oxabicyclo[3.n.1]alkan-3-ones can be constructed by this process in which two new carbon-carbon bonds are generated. Unusually high regioncontrol is observed, and good to excellent stereochemicalcontrol can be achieved at virtually every position on the new carbocycles. Intramolecular neighboringgroupparticipation is proposed to explain the unusually high selectivities attained in the annulation
A compound having the structure
wherein R is hydrogen or methyl, having a strong odour and for use as a perfumery ingredient.
具有以下结构的化合物
其中 R 为氢或甲基,具有强烈气味,可用作香水成分。
Fused-ring quinone-substituted polynorbornene, electrode active material and secondary battery
申请人:WASEDA UNIVERSITY
公开号:US10164258B2
公开(公告)日:2018-12-25
A fused-ring quinone-substituted polynorbornene has recurring units of formula (1) and/or (2) below.
In formulas (1) and (2), A1 is independently a substituent of formula (3) or (4) below, n is an integer from 1 to 6, and A2 is a substituent of formula (5) or (6) below.
In formulas (3) to (6), each X is independently a single bond or a divalent group, and Ar1 and Ar2 are each independently an aromatic hydrocarbon ring or an oxygen atom or sulfur atom-containing aromatic heterocycle that forms together with two carbon atoms on a benzoquinone skeleton. This polymer has charge-storing properties and, when used as an electrode active material, is capable of providing a high-performance battery possessing high capacity, high rate characteristics and high cycle characteristics.
Charge storage material, electrode active material and secondary battery
申请人:WASEDA UNIVERSITY
公开号:US10326138B2
公开(公告)日:2019-06-18
Materials having charge-storing properties and made variously of dipyridine-fused benzoquinones of formula (1) below or derivatives thereof, dipyridine-fused benzoquinones of formula (4) below or derivatives thereof, or dipyridine-fused benzoquinone skeleton-containing polymers are provided.
In the formulas, Ar1 and Ar2 are each independently a pyridine ring that forms together with two carbon atoms on a benzoquinone skeleton, or a derivative thereof. When used as electrode active materials, these charge storage materials are capable of providing high-performance batteries possessing a high capacity, high rate characteristics and high cycle characteristics.
Nucleic acid fragment and vector comprising a halogenase, and a process for halogenating chemical compounds
申请人:——
公开号:US20030096335A1
公开(公告)日:2003-05-22
The invention relates to a process halogenation, which comprises halogenating a chemical compound in the presence of a halogenase, where the halogenase is
(a) encoded by the sequence specified in SEQ ID NO: 1 or a sequence derived therefrom on the basis of the degeneracy of the genetic code, or is
(b) encoded by a nucleic acid sequence which codes for a functional fragment of (a) or
(c) by a sequence which hybridizes with (a) or (b) under standard conditions, or is
(d) encoded by a sequence which has more than 30% identity or more than 60% similarity with the sequence specified under (a).