Polyhalogenated heterocyclic compounds. Part 41. Cycloaddition reactions involving hexafluorobut-2-yne and 1,1,1,2,4,4,4-heptafluorobut-2-ene
作者:Richard D. Chambers、Alex J. Roche、Michael H. Rock
DOI:10.1039/p19960001095
日期:——
Cycloadducts, formed by addition of hexafluorobut-2-yne, may be transformed into bis(trifluoromethyl)-benzene, -phenol and -furan derivatives. Tetrakis(trifluoromethyl)benzene may also be produced. Heptafluorobut-2-ene 2 is also a very efficient dienophile for reactions with cyclopentadiene and furan. Reaction of 2 with furan derivatives at elevated temperatures gives a very effective ‘one pot’ synthesis of 3,4-bis(trifluoromethyl)furan derivatives.
Unusual reaction of sulphur tetrafluoride: conversion of the methyl group into difluoromethyl and trifluoromethyl groups
作者:I. Nowak、W. Dmowski、W.A. Manko
DOI:10.1016/0022-1139(95)03331-8
日期:1995.12
The reaction of 2,5-dimethyl-3,4-furandicarboxylic acid (1) with sulphur tetrafluoride gave crystalline 2,5-dimethyl-4-trifluoromethyl-3-furanoyl fluoride (2) and a liquid composed of 2-methyl-5-difluoromethyl-3,4-bis(trifluoromethyl)furan (4), 2-methyl-3,4,5-tris(trifluoromethyl)furan (5) and only small amounts of the expected 2,5-dimethyl-3,4-bis(trifluoromethyl)furan (3).