- Salen-Based Amphiphiles: Directing Self-Assembly in Water by Metal Complexation
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Tuning morphologies of self-assembled structures in water is a major challenge. Herein we present a salen-based amphiphile which, using complexation with distinct transition metal ions, allows to control effectively the self-assembly morphology in water, as observed by Cryo-TEM and confirmed by DLS measurements. Applying this strategy with various metal ions gives a broad spectrum of self-assembled structures starting from the same amphiphilic ligand (from cubic structures to vesicles and micelles). Thermogravimetric analysis and electric conductivity measurements reveal a key role for water coordination apparently being responsible for the distinct assembly behavior.
- Tosi, Filippo,Stuart, Marc C. A.,Wezenberg, Sander J.,Feringa, Ben L.
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- High ortho preference in Ni-catalyzed cross-coupling of halophenols with alkyl Grignard reagents
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(Chemical Equation Presented) High preference of substitution at the position ortho to the hydroxy group was observed for Ni-catalyzed cross-coupling reactions of dihalophenols with alkyl Grignard reagents. Reactions of 2,4-dihalophenols, with various com
- Wang, Jia-Rui,Manabe, Kei
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supporting information; experimental part
p. 741 - 744
(2009/08/07)
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- Total synthesis of (±)-chondrillin, (±)-plakorin, and related peroxy ketals. development of a general route to 3,6-dihydro-1,2-dioxin-3-ols
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Seven-step syntheses of the antitumor cyclic peroxy ketals la, 2a, chondrillin (Ib), and plakorin (2b) from (methoxymethoxy)benzene (8) have been achieved in 26-28% overall yields. The key step is the photooxygenation of enone 4 with a sun lamp using rose bengal lactone or CuSO4 as a sensitizer which gives a mixture of peroxy hemiketals 15 and 16 in 75-85% yields. Acetal formation in acidic methanol completes the syntheses of 1 and 2. The mechanism of photooxygenation was ascertained using 3-nonen-2-one (22) as a model for 4. Irradiation converts 22 to the cis-enone 23 which undergoes photoenolization to give 24. Dienol 24 undergoes a sensitized reaction with oxygen to give 29 and 30. The detailed mechanism of this last step is not known, although singlet oxygen is probably not involved. This reaction is general for any enone or enal which can undergo photoenolization to give a dienol. Peroxy hemiketals 33a, 41, and 43-46 were prepared in 30-80% yields. Peroxy ketals can be used for the synthesis of furans, diones, and pyridazines.
- Snider, Barry B.,Shi, Zhongping
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p. 1790 - 1800
(2007/10/02)
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- Overbased sulfurized alkaline earth metal phenates and process for preparing same
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Overbased sulfurized alkaline earth metal phenates which are oil soluble, excellent in detergency dispersancy and have high base value, and an effective process for production of said overbased sulfurized alkaline earth metal phenates under conditions providing less sludge and less raw material recovery, and further a lubricating oil additives containing said overbased sulfurized alkaline earth metal phenates as a main ingredient and a lubricating oil composition which comprises said lubricating oil additive compounded in a lubricating oil are disclosed. Since the resulting overbased sulfurized alkaline earth metal phenates have high base value and excellent oil-solubility, they can be effectively utilized as lubricating oil additives.
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- Process for treating 2-ethylhexyl p-methoxycinnamate in the presence of a phenol
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A process for treating 2-ethylhexyl p-methoxycinnamic acid ester is described. The process comprises heating, preferably distilling, the ester in the presence of a phenol to insure that the ester is considered Ames negative.
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- Long-chain alkylphenols
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A method for producing long chain-length alkylphenols with preferential production of para-alkylphenols and placement of the phenolic moiety at the #2 position on the alkyl chain. The reaction is carried out in the presence of crystalline zeolites having a major pore dimension of about six to seven angstrom units.
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