- Structured copolymers and their use as absorbents, gels and carriers of metal ions
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Dense star polymers or dendrimers having a highly branched interior structure capable of associating or chelating with metal ions are modified by capping with a hydrophobic group capable of providing a hydrophobic outer shell. The modified dendrimers are useful for dispersing metal ions in a non-aqueous polymer matrix. Also dense star polymers or dendrimers having a highly branched hydrophilic interior structure are modified by capping with a hydrophobic group capable of providing a hydrophobic outer shell, which modified polymers are useful as gels and surfactants.
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- Synthesis and Insecticidal Activity of Oxazaphospholidines, Oxathiaphospholanes, and Thiazaphospholidines
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Fifty-five new five-membered cyclic organophosphorus compounds including oazaphospholidines, thiazaphospholidines, and oxathiaphospholanes were synthesized, which have substituents at 4- or/and 5-positions besides at the 2-position.The thiazaphospholidines showed the highest insecticidal activity followed by oxathiaphospholanes and oxazaphospholidines.The position preference of substituents in insecticidal activity was most obvious in the oxazaphospholidines.It was preferable for insecticidal activity to have the substituent near the more basic atom: the 4-position for thiazaphospholidine and oxazaphospholidine, the 5-position for oxathiaphospholane, with the exception of 4- or 5-phenyl oxazaphospholidine.
- Wu, Shao-Yong,Hirashima, Akinori,Takeya, Ryuko,Eto, Morifusa
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p. 2911 - 2918
(2007/10/02)
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- REACTION OF tert-BUTOXYMETHYL-SUBSTITUTED THIIRANE WITH VARIOUS AMINES
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1,2-Epoxy-3-tert-butoxypropane was synthesized by the reaction of the respective chlorohydrin with a 20percent solution of sodium hydroxide.Thioepoxidation of the oxirane with thiourea gave 1,2-epithio-3-tert-butoxypropane, which is the key compound for the synthesis of tert-butoxymethyl-substituted aminothiols.
- Allakhverdiev, M. A.,Farzaliev, V. M.,Khalilova, A. Z.,Ibragimov, N. Yu.,Sultanov, Yu. M.,Cherkasova, E. M.
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p. 2054 - 2058
(2007/10/02)
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- Crown Cation Complex Effects. 20. Syntheses and Cation Binding Properties of Carbon-Pivot Lariat Ethers
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In an effort devise synthetic cation binders that will mimic the behavior of naturally occuring ionophores such as valinomycin, we have prepared approximately 30 macrocyclic (crown) polyethers bearing flexible side chains attached to the macro ring at carbon.In many of these "carbon-pivot" compounds, the side chain contains one or more neutral donor groups that, if in a suitable geometrical arrangement, may provide additional solvation to the macro-ring-bound cation.Although such donors often enhanced the cation binding ability, overall, the increases in stability constants were modest.The physical resemblance and concept of "roping and tying" the cation suggest the name "lariat ethers".Syntheses of these molecules and binding by them of Na+ and K+ cations are reported and conclusions drawn about the structural requirements and cation binding efficacy of these materials.
- Dishong, Dennis M.,Diamond, Craig J.,Cinoman, Michael I.,Gokel, Geoge W.
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p. 586 - 593
(2007/10/02)
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- Process for making vicinal epoxides and dihalides
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Vicinal epoxides and alkylene dihalides are produced by decomposing a β-haloalkyl carbonate of the general formula STR1 in the presence of a quaternary ammonium or phosphonium salt.
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- An Electron Spin Resonance Study of 3-Oxypropenoyl Radicals derived from Glycidols
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Glycidols with blocked OH groups (A; M = alkyl or trialkylsilyl) react with t-butoxyl radicals to show the e.s.r. spectra of the corresponding 3-oxypropenoyl radicals (D), and 24 examples of these acyl radicals are reported.The reaction is thought to proceed through the formation of the allyloxyl radicals (B), which, in part, are converted into the aldehyde (C) which is very reactive towards loss of hydrogen to give the acyl radical (D).Glycidyl pivalate (A; M = COCMe3) reacts cleanly in this way, but glycidyl acetate (E; R = Me) also undergoes intramolecular 1,5-transfer of the acyl group to show the spectrum of the enoxyl radical (F).Glycidyl propionate and butyrate do not undergo this acyl transfer, but show the spectra of the radicals and (R' = Me or Et).
- Davies, Alwyn G.,Hawari, Jalal A.-A.,Muggleton, Brenda,Tse, Man-Wing
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p. 1132 - 1137
(2007/10/02)
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