5-Bromo-N-methyl-pyrimidin-2-amine.

In the title mol-ecule, C(5)H(6)BrN(3), the pyrimidine ring is essentially planar, with an r.m.s.

Synthesis of retinyl palmitate catalyzed by Candida sp.99-125 lipase immobilized on fiber-like SBA-15 mesoporous material.

Candida sp.99-125 lipase was suitable for transesterification of fats and oils to produce fatty acid methyl ester. The adsorption of Candida sp.

Preparation of biodiesel catalysed by KF/CaO with ultrasound.

Biodiesel, chemically consists of fatty acid methyl ester (FAME) produced by methanolysis of natural triglycerides, such as animal fats and vegetable oils, is a kind of biomass energy, which is renewable and ecofriendly. In this article, KF/CaO was used as solid base catalyst for transesterification of soya bean oil and methanol, while ultrasound as supplementary means. Compared to mechanical stirring, ultrasound treatment is an effective method to increase the yield of FAME and shorten reaction time.

2,6-Dichloro-N-phenyl-benzamide.

There are two independent mol-ecules in the asymmetric unit of the title compound, C(13)H(9)Cl(2)NO, in which the dihedral angles between the phenyl and dichloro-phenyl rings have significantly different values [48.5 (3) and 65.1 (3)°].

4-Nitro-benzyl 2-chloro-acetate.

In the mol-ecule of the title compound, C(9)H(8)ClNO(4), the nearly planar acetate moiety [maximum deviation = 0.015 (3) Å for an O atom] is oriented with respect to the plane of the aromatic ring at a dihedral angle of 73.03 (3)°.

4-Nitro-benzyl 2-bromo-acetate.

In the mol-ecule of the title compound, C(9)H(8)BrNO(4), the acetate group is close to planar [maximum deviation = 0.042 (3) Å] and is oriented at a dihedral angle of 73.24 (3)° with respect to the aromatic ring.

2-Nitro-benzyl 2-chloro-acetate.

In the mol-ecule of the title compound, C(9)H(8)ClNO(4), an intra-molecular C-H⋯O inter-action results in the formation of a near-planar (r.m.s.

7-Chloro-5-(2-ethoxy-phen-yl)-1-methyl-3-propyl-2,6-dihydro-1H-pyrazolo[4,3-d]pyrimidine.

In the title compound, C(17)H(21)ClN(4)O, the benzene ring is oriented at dihedral angles of 1.59 (3) and 1.27 (3)° with respect to the pyrimidine and pyrazole rings, while the dihedral angle between the pyrimidine and pyrazole rings is 0.

[Kinetics on dimethoate aqueous solution degradation in ultrasonic airlift loop Reactor].

The kinetic rules of degradation were studied in ultrasonic airlift loop reactor (UALR) in which O3 was introduced as oxidant and the organophosphorus pesticide dimethoate was used as typical contaminant. It was found that the dimethoate degradations under the individual ultrasonic radiation treatment without O3 (US), the oxidation of O3 gas (O3) and the synergetic effect of UALR and O3 (UALR/O3) were all consonant with the apparent first-order reaction by the kinetics investigations. The dimethoate removal rates of US, O3 and UALR/O3 methodologies under the conditions of dimethoate initial concentration of 50 mg/L, initial solution pH of 6.

Study on degradation of dimethoate solution in ultrasonic airlift loop reactor.

In this work, the degradation of dimethoate solution in ultrasonic airlift loop reactor (UALR) assisted with advanced oxidation processes was studied. The effects of O3 flow rate, ultrasonic intensity, pH value and reaction temperature on the degradation rate were investigated. UALR imposed a synergistic effect combining sonochemical merit with high O3 transfer rate.

6-Methyl-pyridin-3-amine.

In the mol-ecule of the title compound, C(6)H(8)N(2), the methyl C and amine N atoms are 0.021 (2) and 0.058 (2) Å from the pyridine ring plane.

[Treatment of 4, 4'-dBB in aqueous solution using O3/H2O2 system and its synergetic kinetics].

A comparative study of O3 alone and O3/H2O2 was made to evaluate their respective effectiveness for removal of persistent organic pollutants (POPs) from water with 4, 4'-dibro minated biphenyl (4, 4'-DBB) as the model pollutant, and UV254 was used as the surrogate parameter for TOC and DOC. It was found that both processes enhanced the removal rate. Especially, it has been made a further enhancement of the removal of 4, 4'-DBB as H2O2 was added under the alkaline-condition.