- Synthesis, structures of (aminopyridine)nickel complexes and their use for catalytic ethylene polymerization
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A series of α-aminopyridines in the form of (2,6-C6H 3N)(R1)(CHR2NR3R4) (R1 = R2 = H R3 = H R4 = iPr (L1a), R4 = tBu (L1b), R4 = Ph (L1c), R4 = 2,6-Me2C6H3 (L1d), R4 = 2,6-iPr2C6H3 (L1e), R1 = R2 = H R3 = R4 = Et (L1f), R1 = H R2 = Me R3 = H R4 = iPr (L2a), R4 = Ph (L2c), R4 = 2,6-Me 2C6H3 (L2d), R4 = 2,6- iPr2C6H3 (L2e), R1 = Me R2 = H R3 = H R4 = 2,6-iPr 2C6H3 (L3e)) and β-aminopyridines in the form of (2-C6H4N)(CH2CH2NR 1R2) (R1 = H R2 = iPr (4a), R2 = tBu (L4b), R1 = R2 = Et (L4f)) have been prepared. Their corresponding halonickel complexes 1a-4f are synthesized by ligand substitution from (DME)NiBr2 and the molecular structures are characterized. Four types of coordination modes include four-coordinate mononuclear species with one ligand, five-coordinate mononuclear species with two ligands, five-coordinate dinuclear species with two ligands, and a six-coordinate polymeric framework were determined by X-ray crystallography. Using methylaluminoxanes (MAO) as the activator, the nickel complexes can catalyze ethylene polymerization under moderate pressure and ambient temperature. The activity reaches 105 g PE mol-1 Ni h. The PE products with high branching and high crystallinity have M n ～ 103 with PDI 2.
- Lin, Ya-Chi,Yu, Kuo-Hsuan,Lin, Ya-Fan,Lee, Gene-Hsiang,Wang, Yu,Liu, Shiuh-Tzung,Chen, Jwu-Ting
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p. 6661 - 6670
(2012/08/08)
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- Synthesis of some quaternary ammonium alkylating agents and their effects on soman-inhibited acetylcholinesterase
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A number of compounds were synthesized and tested for their ability to realkylate the phosphonate anion of 'aged', soman-inhibited acetylcholinesterase. None were found able to do so, but two of the compounds in particular, [2-(4-pyridyl)ethyl]diethylmethylammonium iodide and its 2-isomer, proved able to slow the rate of aging significantly.
- Gray,Platz,Chang,Leverone,Ferrick,Kramer
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p. 111 - 116
(2007/10/02)
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- SYNTHESIS OF FUNCTIONALLY SUBSTITUTED PYRIDINES AND DIPYRIDYL-SUBSTITUTED COMPOUNDS WITH THE AID OF LOW-VALENCE COMPOLEXES
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The possibility of the preparation of oxygen, nitrogen, and sulfur-containing pyridines and dipyridyl-substituted compounds by the cyclocotrimerization of substituted propionitriles with acetylene under the influence of a Co(2-ethylhexanoate)2-Al(C2H5)3 catalyst was demonstrated.It was established that the nature of the heteroatom in substituted propionitriles has virtually no effect on the direction of the reaction.
- Selimov, F. A.,Khafizov, V. R.,Dzhemilev, U. M.
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p. 290 - 295
(2007/10/02)
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- Process for the catalytic production of 2-substituted pyridines
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A process for the catalytic production of a 2-substituted pyridine which comprises reacting a corresponding cyano compound and acetylene in the presence of cobaltocene. Favorable conversion speed, conversion of at least 90 percent, good yield and high selectivity are obtained.
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