- Synthesis, crystal structures, and solid state quadratic nonlinear optical properties of a series of stilbazolium cations combined with gold cyanide counter-ion
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Three salts built up from (E)-4′-(dimethylamino)-stilbazolium (DMAS)H+, (E)-4′-(diethylamino)-stilbazolium (DEAS)H +, (E)-4′-{2-(methoxymethyl) pyrrolidinyl}-stilbazolium (MPS)H+, and gold cyanide as a counter-ion, are rep
- Lacroix, Pascal G.,Munoz, M. Carmen,Gaspar, Ana Belen,Real, Jose Antonio,Bonhommeau, Sebastien,Rodriguez, Vincent,Nakatani, Keitaro
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experimental part
p. 15940 - 15949
(2012/07/30)
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- Dimethyl sulfoxide mediated elimination reactions in 3-aryl 2,3-dihalopropanoates: Scope and mechanistic insights
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(Chemical Equation Presented) Dimethyl sulfoxide (DMSO) efficiently causes the reductive elimination of 3-aryl 2,3-dibromopropanoates to cinnamates with good yield. With 3-phenyl 2,3-dihalopropanoates, debromination is the major pathway providing 3-phenylacrylate derivatives in high yields, whereas dehydrobromination is a competing pathway with thiophene derivatives. 1H NMR, 81Br NMR, and MS techniques indicated the formation of brominated-DMSO, MeBr, and HBr as byproducts in this transformation with no evidence for the formation of Br2. The dual role of DMSO as a nucleophile and bromine scavenger accounts for the products formed in this reaction.
- Li, Wei,Li, Jianchang,Lin, Melissa,Wacharasindhu, Sumrit,Tabei, Keiko,Mansour, Tarek S.
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p. 6016 - 6021
(2008/02/10)
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- Single crystal preparation of DAST for terahertz-wave generation
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DAST (1-methyl-4-{2-[4-(dimethylamino)phenyl]ethenyl}pyridinium p-toluenesulfonate) is a promising crystalline material for electro-optic applications and THz-wave generation. DAST powder for crystal growth was prepared by two synthesis routes including the conventional one and we confirmed that purity of DAST powder became indistinguishable after proper recrystallization even using conventional synthesis process. The highest solubility of DAST was found for methanol-acetonitrile mixture, and DAST crystal growth in this mixture or methanol-ethanol mixture gave thicker crystals than those grown in methanol. Thus, morphological control of DAST single crystals was found to be possible by varying solvents.
- Mineno, Yoshihiro,Matsukawa, Takeshi,Ikeda, Satoshi,Taniuchi, Tetsuo,Nakanishi, Hachiro,Okada, Shuji,Adachi, Hiroaki,Yoshimura, Masashi,Mori, Yusuke,Sasaki, Takatomo
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- Synthesis and characterization of donor-acceptor chromophores for unidirectional electron transfer
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(Chemical Equation Presented) A series of electron-transfer chromophores containing a donor and acceptor linked by an alkyl spacer were synthesized, and their electronic spectra were investigated. By inclusion with amylose, the supramolecularly encapsulat
- Pepitone,Jernigan,Melinger,Kim
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p. 801 - 804
(2007/10/03)
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- Excited-state proton transfer and excited-state de-hydrogen bonding of the push-pull styryl system
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The excited-state reaction of push-pull styryl system was studied in this work. In the excited state, compounds of 2-StP-NMe2, 2-StQ-NMe 2, 4-StQ-NMe2 and 4-StP-NMe2 possess a sufficiently large acidity change f
- Wang, Shun-Li,Gao, Guo-Yi,Ho, Tong-Ing,Yang, Li-Yu
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p. 217 - 222
(2007/10/03)
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- The Rate and Equilibrium Constants for N-, O-Acyl Transfer
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Reactions with dimethylcarbamoyl group transfer from N-acylpyridinium salts to pyridine N-oxides and from N-acyloxypyridinium salts to pyridines in acetonirile solutions were studied. Their rate and equilibrium constants and activation parameters were determined. The reactions were shown to be one-step and to follow the SN2 mechanism. Equations relating the rate and equilibrium parameters of the N-O and O-N acyl transfer reactions to the basicity of the nucleophile and outgoing group were obtained.
- Rybachenko,Chotii,Kovalenko,Shreder
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p. 1695 - 1698
(2007/10/03)
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