Several new nickel complexes are prepared by the treatment of the stabilized ylide benzoylmethylenetri(2-alkoxylphenyl)phosphorane with Ni(cod)(2) in the presence of PPh(3). X-Ray diffraction studies reveal that a distorted square planar geometry around Ni(II) is adopted. Upon treatment with Ni(cod)(2), the nickel complexes are sufficiently robust for ethylene polymerization. The existence of 2-alkoxyl-aryl substituents on phosphorus improves the catalytic activities. The highest activity (2.1 × 10(6) g mol(-1) h(-1)) is achieved when tri(2-isopropoxy-phenyl)phosphorane is employed (5e), which is one order higher than the corresponding SHOP catalyst. NMR analysis shows that the polyethylene mainly contains terminal double bonds and is highly linear.
Pseudomonas sp. B3-1, a wild strain isolated from soil, produced catechol from benzoate and accumulated it outside the cell. catA, a gene encodes a catechol 1,2-dioxygenase in the bioconversion of aromatic compounds, plays the central role in accumulation of catechol. Mutant of the catA gene is disrupted without blocking the transcription of downstream genes was analyzed. The result showed that the mutant had less catechol 1, 2-dioxygenase activity, only 1/3 of strain B3-1’s. The mutant produced a maximal amount of catechol (1.22 mg/ml) from 4 mg/ml of sodium benzoate after growing for 48 h. The conversion rate of benzoate to catechol was 51.5% on a molar basis.
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