Diethyl Iododifluoromethylphosphonate: A New Synthetic Method and Its Reaction with Alkynes
作者:An-Rong Li、Qing-Yun Chen
DOI:10.1055/s-1996-4269
日期:1996.5
Refluxing difluorodiiodomethane and triethyl phosphite in diethyl ether for 5 hours gave diethyl iododifluoromethylphosphonate (1) nearly quantitatively. The addition of 1 to alkynes initiated by sodium dithionate at 0°C resulted in the corresponding adducts in high yields.
The Addition Reaction of Iododifluoromethylated Compounds with Alkenes or Alkynes: A General Method of Synthesizing Functionalized gem-Difluoroalkanes
作者:An-Rong Li、Qing-Yun Chen
DOI:10.1055/s-1997-1184
日期:1997.3
1,1-Difluoro-1,3-diiodoheptane (1) and 4,4-difluoro-4-iodobutyronitrile (4) derived from difluorodiiodomethane reacted with alkenes or alkynes in the presence of sodium dithionite and sodium bicarbonate at room temperature to afford the various CF2-containing compounds in good yields.
Lead Tetraacetate Induced Addition Reaction of Difluorodiiodomethane to Alkenes and Alkynes. Synthesis of Fluorinated Telechelic Compounds
作者:An-Rong Li、Qing-Yun Chen
DOI:10.1055/s-1997-1378
日期:1997.12
Lead tetraacetate (LTA) can smoothly induce the addition reaction of difluorodiiodomethane (1) with electron-rich alkenes at 60°C in diglyme to give monoadducts (RCHICH2CF2I) and diadducts (RCHICH2)2. The similar, clean reaction of fluoroolefins, such as tetrafluoroethene, hexafluoropropene, with 1 occurs only in acetic acid. However, non-fluorinated β-iodo-α,β-unsaturated carboxylic esters are obtained when 1 reacts with alkynes in alcohol. The iododifluoromethyl radical generated by possible pathways from 1 with LTA is discussed.
A simple, novel method for the preparation of trifluoromethyl iodide and diiododifluoromethane
作者:De-Bao Su、Jian-Xing Duan、Qing-Yun Chen
DOI:10.1039/c39920000807
日期:——
CF3l was synthesized in high yields by treatment of XCF2CO2Me(X = Cl or Br) with iodine in the presence of potassium fluoride and copper iodide; if Kl was used instead of KF under similar conditions, CF2l2 was obtained in moderate yields.
A highly efficient synthesis of triisopropylsilyldifluorobromopropyne yields a versatile gem-difluoromethylene building block
作者:ZhiGang Wang、Gerald B. Hammond
DOI:10.1039/a907784g
日期:——
Triisopropylsilyldifluorobromopropyne, readily prepared in excellent yield from the reaction of lithium triisopropylsilylacetylide with CF2Br2, provides a convenient entry into a functionalized CF2 synthon.