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Lastowski, R Joseph ; Flores, Vincent J ; Souqui, Laurent , et al. Organometallics,2024,43(20):2548-2556. DOI: 10.1021/acs.organomet.4c00186
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Abstract: We describe the synthesis and characterization of three new square-planar compounds of stoichiometry M-[(CH2)3NMe2]2, where M = Ni, Pd, or Pt, each of which contains two chelating 3-dimethylamino-1-propyl ligands. The nickel(II) and palladium(II) compounds decompose above -78 and 0 °C, respectively, but the platinum(II) compound has a thermolysis onset temperature of 130 °C. The Pd and Pt complexes are dynamic in solution: they undergo ring inversion with small free energies of activation of ΔG? = 7.9 ± 0.1 and 8.3 ± 0.1 kcal mol-1, respectively, at 298 K. The Pt complex sublimes at 40 °C and 5 mTorr. In benzene solution, the Pt compound thermolyzes primarily through β-hydrogen elimination; 80 ± 10% of the hydrogen atoms and 75 ± 5% of the carbon atoms from the precursor can be accounted for in the byproducts. The thermolysis of the Pt complex in C6D6 follows first-order kinetics, with an activation free energy ΔG? of 29.9 ± 0.1 kcal mol?1 at 110 °C. Under CVD conditions, thin films grown of the Pt complex at 200 °C contain nanocrystalline Pt; analysis of the film growth byproducts suggest that the main decomposition pathway involves β-hydrogen elimination and reductive elimination steps, as seen in solution.
Purchased from AmBeed: 109-54-6
CAS No. : | 109-54-6 | MDL No. : | MFCD00044496 |
Formula : | C5H12ClN | Boiling Point : | - |
Linear Structure Formula : | (CH3)2N(CH2)3Cl | InChI Key : | NYYRRBOMNHUCLB-UHFFFAOYSA-N |
M.W : | 121.61 | Pubchem ID : | 66960 |
Synonyms : |
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Chemical Name : | 3-Chloro-N,N-dimethylpropan-1-amine |
Signal Word: | Warning | Class: | |
Precautionary Statements: | P422-P411-P280-P305+P351+P338 | UN#: | |
Hazard Statements: | H317-H319 | Packing Group: | |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
76.9% | Stage #1: With iodine; magnesium In 2-methyltetrahydrofuran at 60℃; for 4.83333 h; Inert atmosphere Stage #2: at -20℃; for 17.6167 h; Inert atmosphere Stage #3: With hydrogen bromide In 2-methyltetrahydrofuran at 3℃; for 1 h; |
Example 3 Preparation of N,N-dimethyl-3-chloromagnesiopropylamine Grignard reagent 2-methyl tetrahydrofuran as solvent: Reaction process: At room temperature, Mg (7.28 g, 300 mmol) and iodine granules (0.506 g, 2 mmol) were suspended in anhydrous 2-methyltetrahydrofuran (80 mL, moisture content: 0.016percent), the reaction mixture was purged with nitrogen for 6 times. The reaction mixture was heated to 60 deg. C and stirred for 15min, the mixture was orange-red. 3-chloro-N, N-dimethylpropylamine (CPA) (24.32 g, 200 mmol) was dissolved in anhydrous 2-methyltetrahydrofuran (120 mL) was added dropwise to the above reaction mixture, reaction liquid from milky white to gray-green, 110min dropwise additon was finished, reaction at 60 ° C for 3 h, the solution of N,N-dimethyl-3-chloromagnesiopropylamine Grignard reagent in 2-methyltetrahydrofuran was cooled to room temperature and was directly used in the next reaction. Example 4 Preparation of 4-(4-(dimethylamino)-1-(4-fluorophenyl)-1-hydroxybutyl)-3-(hydroxymethyl)benzonitrile hydrobromide 2-methyl tetrahydrofuran as solvent: Reaction process: To a solution of the Grignard reagent of formula (III) (200 mL, 200 mmol) in anhydrous 2-methyltetrahydrofuran (541 mL) was added dropwise a solution of 2-methyltetrahydrofuran (541 mL) of formula (II) (54.30 g, 151.50 mmol), the solution was added dropwise over 97 min and the reaction mixture was stirred at -20 ° C for 16 h under nitrogen. Reaction post-treatment: Samples were quenched with saturated NH4Cl solution, and 2-methyltetrahydrofuran was analyzed by HPLC. The reaction mixture was allowed to warm to 0 ° C, and a saturated NH4Cl solution (120 mL) was added dropwise to the reaction mixture to quench the reaction mixture. The temperature of the reaction solution was maintained at 10 ° C or less, the white viscous solid was removed by suction filtration, the filtrate was cooled to 3 ° C and hydrogen bromide (30.30 g, 48percent, 179.70 mmol) was added dropwise to the filtrate, the reaction mixture was stirred at 3 ° C for 1 hour. The filtrate was concentrated under reduced pressure to remove 2-methyltetrahydrofuran. The reaction mixture was stirred at room temperature with CH2Cl2 (500 mL) and H2O (250 mL). The reaction mixture was cooled to room temperature, was added to the mixture, a white solid precipitated from the mixture, the reaction mixture was stirred at 15 ° C for 6 h, filtered, the white filter cake was washed with CH2Cl2 (3 x 80 mL) and dried in vacuo at 60 ° C for 16 h to give a white solid (49.33 g, yield: 76.9percent, based on 5-cyanophthalocyanine). |
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