- Bisphosphonic Compounds. Part 3. Preparation and Identification of Tetraalkyl Methylene- and (α-Halomethylene)bisphosphonates by Mass Spectrometry, NMR Spectroscopy and X-Ray Crystallography
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The preparation and identification of tetraalkyl methylenebisphosphonates (XYC2; X = Y = H, Cl or Br and R = alkyl) have been studied.Detailed procedures are given for the synthesis of XYC2 (X = Y = H; R = hexyl; X = Y = Cl or Br and R = Me). 1H, 13C and 31P NMR data are reported including 1JCH, 2JCP', 3JCP and 2JPP coupling constants.The fragmentation of 19 XYC2 has been studied in the gas phase.The solid state structures are given for two compounds (X = Y = Cl, R = Pri and X = Y = Br, R = Me).
- Vepsaelaeinen, Jouko,Nupponen, Heikki,Pohjala, Esko,Ahlgren, Markku,Vainiotalo, Pirjo
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p. 835 - 842
(2007/10/02)
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- α-Substituted Phosphonates. 39. Methane-diphosphonic Esters by U.V.-Induced Michaelis-Becker-Reaction
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Dibromomethane resp. chlorbromomethane reacts with sodium dialkyl phosphite in heptane-/liq.NH3 or in liq.NH3 by u.v. irradiation at low temperatures to give in good yields methane diphosphonic acid tetraalkylesters 1.In the same manner with sodium diethyl thionophosphite the corresponding methane-bisthiophosphonic acid tetraethylester 4 is obtained.
- Czekanski, T.,Gross, H.,Costisella, B.
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p. 537 - 544
(2007/10/02)
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