Synthesis of novel partially fluorinated phosphonic/sulfonic acids
摘要:
A new-synthesis of (EtO)2P(O)CH2OCH2CH = CH2 (1) has been developed. Addition of I(CF2)4SO2F or I(CF2)2O(CF2)2SO2F to 1 followed by hydrolysis, reduction and ion exchange of the addition adducts gave (HO)2P(O)CH2O(CH2)3(CF2)4SO3H.2H2O and (HO)2P-(O)CH2O(CH2)3(CF2)2O(CF2)2SO3H.3H2O, respectively.
A useful synthesis of ω-iodoperfluoroalkanesulfonyl fluorides and perfluoroalkane-α,ω-bis-sulfonyl fluorides
摘要:
Omega-iodoperfluoroalkanesulfonyl fluorides and perfluoroalkane-alpha,omega-bis-sulfonyl fluorides have been prepared via deiodosulfination, chlorination, and then chlorine-fluorine exchange reaction of alpha,omega-diiodoperfluoroalkanes I(CF2)nI (n=3, 4, 6). Similar reaction of I(CF2)2O(CF2)2SO2F affords FSO2(CF2)2O(CF2)2SO2F.
Facile Synthesis of Fluorinated Phosphonates <i>via</i> Photochemical and Thermal Reactions
作者:Haridasan K. Nair、Donald J. Burton
DOI:10.1021/ja971345t
日期:1997.10.1
Under UV irradiation (254 nm) at ambient temperature, a degassed mixture of (EtO)(2)POP(OEt)(2) and RfI R-f=CF3, C2F5, C4F9, C6F13, (CF3)(2)CF, CF2CF=CF2, ClCF2CF2, BrCF2CF2, C6F5, ClCF2CFClCF2CF2, I(CF2)(3), I(CF2)(4), FO2S(CF2)(4), FO2S(CF2)(2)O(CF2)(2)} affords the fluorinated phosphonite, [RfP(OEt)(2)]. Oxidation of the phosphonites, [RfP(OEt)(2)], with Me3COOH gave the corresponding fluorinated phosphonates, (EtO)(2)P(O)R-f(1-14), in 35-80% isolated yields. CF3CCl2I reacts with (EtO)(2)POP(OEt)(2) at room temperature in the absence of UV irradiation to afford [CF3CCl2P(OEt)(2)] which upon oxidation gave a 52% yield of CF3CCl2P(O)(OEt)(2) (15). The reaction of (EtO)(2)POP(OEt)(2) and RfI (R-f=ClCF2CF2, BrCF2CF2, C2F5) at 125 degrees C in the presence of Me3COOCMe3 and subsequent oxidation of the resultant phosphonites afforded phosphonates (2, 7, and 8) albeit in lower yields (49-62%) compared to those of the photochemical reaction (58-80%). (RO)(2)P(O)CF2CF2I (R=Et, i-Pr) (16 and 17) was obtained (42-48%) when a degassed mixture of (RO)(3)P and BrCF2CF2I was subjected to UV irradiation (254 nm) at ambient temperature via a unique photochemical transformation.