Efficient and selective oxidative decarboxylation of arylcarboxylic acids into the corresponding aldehydes and ketones using K5CoIIIW12O40 as a green oxidant under microwave and conventional heating
摘要:
The oxidative decarboxylation of various alpha-aryl-and alpha,alpha-arylcarboxylic acids having electron-donating and electron-withdrawing groups by using a stoichiometric amount of potassium 12-tungstocobaltate(III), (K5CoW12O40)-W-III, in 50% aqueous acetonitrile solution resulted in the corresponding aldehydes and ketones in high yields within short reaction times under microwave irradiation. This transformation was also carried out under the conventional heating conditions which produced the corresponding aldehydes and ketones in relatively longer reaction times. The arylacetic acids with electron-withdrawing substituents required longer reaction times and produced lower yields. In contrast to arylacetic esters which were inert toward decarboxylation, the sodium arylacetates were decarboxylated in shorter times with yields better than those of the parent acids.
Facile Synthesis and X-ray Structure of Alkoxy-Functionalized Dibenzo[<i>f</i><i>g,</i><i>o</i><i>p</i>]naphthacenes
作者:Xiao Hong Cheng、Sigurd Höger、Dieter Fenske
DOI:10.1021/ol034626g
日期:2003.7.1
[structure: see text] 1,3-Bis(2-bromophenyl)-2,5-diphenylbenzenes are readily available by the condensation of phenylacetates with the corresponding pyrylium salts and undergo a palladium-catalyzed dehydrohalogenation to give functionalized dibenzo[fg,op]naphthacenes.
Structures and Fluorescent Properties of Cadmium(II) Complexes with 1D and 2D Structures Based on Tridentate Benzimidazole Ligands
作者:Rui Feng、Yong Hou、Zhen-Zhen Wu、Yan Yang、Feng-Mei Nie
DOI:10.1002/zaac.201400511
日期:2015.9
coordination mode. 1 and 2 form a 1D chain interplayed by hydrogen bonding and strong π–π stacking interactions. 3 and 4 vary from 1D chain into 2D single-layer and double-layer networks because of more extensive hydrogen bonding interactions. The complexes show emission maxima in the blue region in the solid state and emission bands are red-shifted compared to those of the free ligands.
PROCESS FOR THE PREPARATION OF TRANS 4-AMINO-CYCLOHEXYL ACETIC ACID ETHYL ESTER HCL
申请人:Mathe Tibor Bence
公开号:US20110288329A1
公开(公告)日:2011-11-24
The invention relates to a process for the preparation of trans 4-amino-cyclohexil ethyl acetate HCl wherein
d) hydrogenating 4-nitrophenyl acetic acid in a protic solvent at a temperature between 40-50° C. in the presence of Pd/C under 0.1-0.6 bar overpressure, and
e) further hydrogenating the 4-aminophenyl acetic acid obtained in situ in step a) at a temperature between 50-60° C. under 1-4 bar overpressures, then
f) heating to reflux the 4-aminocyclohexil acetic acid obtained in step b) for 1-3 hours in hydrochloric ethanol, and if desired after removing the solvent acetonitrile was added to the residue obtained and distilled off.
[EN] PROCESS FOR THE PREPARATION OF TRANS 4-AMINO-CYCLOHEXYL ACETIC ACID ETHYL ESTER HCL<br/>[FR] PROCÉDÉ DE PRÉPARATION D'UN HCL D'ESTER D'ÉTHYLE D'ACIDE TRANS-4-AMINO-CYCLOHEXYL ACÉTIQUE
申请人:RICHTER GEDEON NYRT
公开号:WO2010070368A1
公开(公告)日:2010-06-24
The invention relates to a process for the preparation of trans 4-amino-cyclohexil ethyl acetate HCl wherein d) hydrogenating 4-nitrophenyl acetic acid in a protic solvent at a temperature between 40-500C in the presence of Pd/C under 0.1-0.6 bar overpressure, and e) further hydrogenating the 4-aminophenyl acetic acid obtained in situ in step a) at a temperature between 50-60 0C under 1-4 bar overpressures, then f) heating to reflux the 4-aminocyclohexil acetic acid obtained in step b) for 1-3 hours in hydrochloric ethanol, and if desired after removing the solvent acetonitrile was added to the residue obtained and distilled off.
Preparation of linear polycarbonates from cyclic oligomer compositions using benzyl carbanion-generating catalyst
申请人:GENERAL ELECTRIC COMPANY
公开号:EP0288788A2
公开(公告)日:1988-11-02
Cyclic polycarbonate oligomers are converted to linear polycarbonate resins by heating with a polycarbonate formation catalyst which generates benzyl carbanions at temperatures up to about 300°C. The preferred catalysts are unsubstituted or nuclearly substituted phenylacetic acids and their salts.