A general procedure for the fluorodenitration of aromatic substrates
摘要:
The synthesis of several fluoroaromatic compounds by a new procedure of fluorodenitration of nitroarenes is reported. The methodology is based on the principle that the nitrite ion, generated during the fluorodenitration processes and responsible for most of the undesired side reactions, can be trapped with a suitable reagent, e.g., phthaloyl difluoride or tetrafluorophthaloyl difluoride. The yields of fluoro compounds thus obtained are good to excellent, and the procedure is of general application.
Gram-Scale Preparation of Acyl Fluorides and Their Reactions with Hindered Nucleophiles
作者:Michał Barbasiewicz、Michał Tryniszewski
DOI:10.1055/a-1649-5460
日期:2022.3
A series of acyl fluorides was synthesized at 100 mmol scale using phase-transfer-catalyzed halogen exchange between acyl chlorides and aqueous bifluoride solution. The convenient procedure consists of vigorous stirring of the biphasic mixture at room temperature, followed by extraction and distillation. Isolated acyl fluorides (usually 7–20 g) display excellent purity and can be transformed into sterically
PROCESS FOR PRODUCING PHTHALIC ACID COMPOUND INCLUDING CHLORINATED AROMATIC RING
申请人:Souda Hiroshi
公开号:US20120035395A1
公开(公告)日:2012-02-09
Provided is a process for producing a phthalic acid compound whose aromatic ring has been chlorinated, the process reacting a phthalic acid compound and chlorine in a mixture of chlorosulfonic acid and thionyl chloride in the presence of an iodine compound.
Difluorobenzenes are prepared by reacting a fluoronitrobenzene of the formula:
in which Hal represents fluorine, chlorine or bromine, Y represents hydrogen or methyl, Z represents hydrogen or a weakly electrodonating group on a non-electrodonating group and n is 1 to 2, with a source of fluoride ion to replace the nitro group by fluorine. The products are useful intermediates in the preparation of drugs based on a quinoline structure.
二氟苯是由式如下的氟硝基苯反应制得的:
其中 Hal 代表氟、氯或溴,Y 代表氢或甲基,Z 代表氢或非电负性基团上的弱电负性基团,n 为 1 至 2。这些产品是制备基于喹啉结构的药物的有用中间体。
305. The tautomerism of phthalyl bromide
作者:William Davies、Arthur N. Hambly、George S. C. Semmens
DOI:10.1039/jr9330001309
日期:——
The Chemistry of Sulfur Tetrafluoride. II. The Fluorination of Organic Carbonyl Compounds<sup>1</sup>