- Synthesis and photoluminescent properties of new ceramidine derivatives
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A series of new ceramidine derivatives 8a-f has been synthesized in 4-5 steps involving a Wittig reaction of ceramidonine with various triphenylphosphonium bromides. Their UV and photoluminescence (PL) properties are reported. The compounds showed medium to strong PL between 502 and 522 nm at a concentration of 1 × 10-5 M CH2Cl2.
- Park, Byung Sun,Lee, Sang Woo,Kim, In Tae,Tae, Jin Sung,Lee, So Ha
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- Catalytic asymmetric epoxidation
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The present invention relates to the synthesis of chiral epoxides via a catalytic asymmetric oxidation of olefins. Additionally, the methodology provides a method of asymmetrically oxidizing sulfides and phosphines. This asymmetric oxidation employs a catalyst system composed of a metal and a chiral bishydroxamic acid ligand, which, in the presence of a stoichiometric oxidation reagent, serves to asymmetrically oxidize a variety of substrates.
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Page/Page column 26
(2010/02/12)
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- Carbon Acidity. 66. Equilibrium Ion Pair Acidities of Substituted Diphenylmethanes in Cyclohexylamine
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The pKCsCHA values are reported for a number of symmetrically meta- and para-substituted diphenylmethanes.The pKCsCHA values for the meta series (Me, 33.8; OMe, 32.7; F, 29.9; CF3, 28.9; Ph, 32.3; H, 33.4) give a normal Hammett plot with ρ = 9.69.The para series (Me, 35.1; OMe,37.6; Ph, 30.8; NMe2, 38.6; SPh, 28.8; CN, 23.0; SO2Me, 22.4) do not fit attempted correlations with ?, the Yukawa-Tsuno modifications, or dual substituent parameter approaches.Electron-donating groups are more anion destabilizing than in other reference systems. "Amphoteric" substituents, those that stabilize both anions and cations (phenyl, thio, etc.), cause special problems in generalized correlations.
- Streitwieser, Andrew Jr.,Vorpagel, Erich R.,Chen, Chia-Chung
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p. 6970 - 6975
(2007/10/02)
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