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anisole/dichloromethane
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Chemical mechanism to account for artifactual formation of shortened peptides with free alpha-amino groups in solid phase peptide synthesis.
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The formation of terminated peptides with free alpha-amino groups has often been observed in stepwise solid phase peptide synthesis. This has been attributed to variable accessibility in regions of the swollen crosslinked resin supports. It is now shown that impurities in the amino acid reagents are
Phase inversion of ionomer-stabilized emulsions to form high internal phase emulsions (HIPEs).
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Herein, we report the phase inversion of ionomer-stabilized emulsions to form high internal phase emulsions (HIPEs) induced by salt concentration and pH changes. The ionomers are sulfonated polystyrenes (SPSs) with different sulfonation degrees. The emulsion types were determined by conductivity
Simultaneous multiple synthesis and selective conjugation of cyclized peptides derived from a surface loop of a meningococcal class 1 outer membrane protein.
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Starting from the alpha-(2,4-dimethoxybenzyl) ester of N-(9-fluorenylmethoxycarbonyl)aspartic acid [Fmoc-Asp-ODmb], side-chain-protected resin-bound Fmoc-peptides containing an N epsilon-1-(4,4-dimethyl-2,6-dioxocyclohexylidene)ethyl lysyl [Lys(Dde)] residue were prepared. The C-terminal
Unexpected change in charge transfer behavior in a cobalt(II) porphyrin-fullerene conjugate that stabilizes radical ion pair states.
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Two cobalt(II) porphyrin-C(60) malonate-linked conjugates, the mono-connected Co1 and the bis-connected trans-2 isomer Co3, have been synthesized for the first time either by direct cyclopropanation with the precursor malonate Co4 or by metalation of the bisadduct H(2)3. For the investigation of the
Synthesis, characterization, and PGSE (1H and 19F) NMR diffusion studies on cationic (eta6- arene)Mn(CO)3+ complexes: boron counterion, ion pairing, and solvent dependences.
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The synthesis, characterization, and PGSE ((1)H and (19)F) NMR diffusion studies on the cationic [(eta(6)-arene)Mn(CO)(3)][X] (arene = anisole, 4-chloroanisole, and 1,3,5-trimethoxybenzene; X = BPh(4) and BArF) are reported. The tetraphenyl borate complexes of anisole and 4-chloroanisole show
Synthesis of Abeta[1-42] and its derivatives with improved efficiency.
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It has been proved that the principal component of senile plaques is aggregates of beta-amyloid peptide (Abeta) in cases of one of the most common forms of age-related neurodegenerative disorders, Alzheimer's disease (AD). Although the synthetic methods for the synthesis of Abeta peptides have been
Reactions on a solid surface. A simple, economical and efficient Friedel-Crafts acylation reaction over zinc oxide (ZnO) as a new catalyst.
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Zinc oxide (ZnO) brings about a rapid Friedel-Crafts acylation of a range of activated and unactivated aromatic compounds such as anisole and chlorobenzene with acid chlorides in solvent-free conditions at room temperature. The ZnO powder can be reused up to three times after simple washing with
Preparations of Core H 2 O-Bound 5, 10, 15, 20-Tetrakis-4-chlorophenyl Porphyrin, P 1 , and O-Methylation of Phenol and Its P-Substituted Analogues
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The treatment of a dichloromethane solution of 5, 10, 15, 20-tetrakis-4-chlorophenyl porphyrin, P 1 , with methanolic solutions of each of phenol, p-amino phenol, and p-nitro phenol for just 1 h results in the formation of water-molecule-bound amorphous solids
Antioxidant property of Decalepis hamiltonii Wight & Arn.
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Aromatic edible root of D. hamiltonii was subjected to the extraction of the antioxidant rich fraction. Different parts of root namely whole tuber, peel, tuber without peel and medullary portion were extracted with dichloromethane (European Patent No. W02005063272). The extract was found to contain
Aggregation of the scarab beetleHolotrichia consanguinea in response to female-released pheromone suggests secondary function hypothesis for semiochemical.
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The pheromone system of the scarab beetleH. consanguinea, an agricultural pest native to India, was investigated by extracting abdominal glands of females with dichloromethane and ether and analyzing them by GC-MS. Indoor bioassays with the natural product separated on a silica gel column showed
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