نتایج جستجو برای: ethyl benzene

تعداد نتایج: 53205  

Ethyl benzene used increasingly each year is the raw material of producing styrene monomer. This substanceis produced from benzene alkylation with ethylene or ethanol, depending on the availability and cost of rawmaterials. In this study benzene alkylation in the presence of ethanol in a catalytic fixed bed reactor inthree states of isotherm, adiabatic and non-isotherm-non-adiabatic is mathemat...

2013
Mohd Sukeri Mohd Yusof Nur Rafikah Razali Suhana Arshad Azhar Abdul Rahman Ibrahim Abdul Razak

In the title mol-ecule, C23H22N2OS, the di-phenyl-acetyl and ethyl-benzene groups adopt a trans-cis conformation, respectively, with respect to the S atom across the (S=)C-N bonds. This conformation is stabilized by an intra-molecular N-H⋯O hydrogen bond and a weak C-H⋯S hydrogen bond. The ethyl-substituted benzene ring forms dihedral angles of 87.53 (15) and 73.94 (15)° with the phenyl rings. ...

2009
Zhan Tang Min Xu Gui-Ru Zheng Hai Feng

In the title compound, C(11)H(16)ClNO, the side chain of the ethyl-amine group is almost perpendicular to the benzene ring; the dihedral angle between the C/C/N plane of the ethyl-amine grouping and the benzene plane is 87.4 (2)°. An intramolecular N-H⋯O hydrogen bond occurs. In the crystal structure, mol-ecules are connected weakly by O-H⋯N hydrogen bonds, forming a tetra-mer around the symmet...

2013
P. Sharmila C. Suresh Kumar Karthik Ananth S. Narasimhan S. Aravindhan

In the title ester derivative, C28H29NO6·0.5H2O, the 1,4-dihydro-pyridine ring has a flattened boat conformation. The mean plane is almost perpendicular to the attached benzene ring, making a dihedral angle of 86.87 (9)°. The terminal phenyl ring is inclined to the central benzene ring by 67.56 (12)°. In the crystal, mol-ecules are bridged via O-H⋯O hydrogen bonds involving the partially occupi...

2008
Zhang Dehua Zhang Xiaoyan

The title compound, C(19)H(13)ClF(2)N(2)O(3), was prepared by the reaction of (Z)-ethyl 3-amino-3-(4-chloro-phen-yl)-2-cyano-acrylate and 2,6-difluoro-benzoyl chloride. The dihedral angle between the chloro-benzene and fluoro-benzene rings is 37.0 (1)°. The ethyl group is disordered over two positions [occupancies = 0.52 (2):0.48 (2)]. In addition to intra-molecular N-H⋯O and N-H⋯F hydrogen bon...

عصاری, محمدجواد, نگهبان, امیررضا, بهرامی, عبدالرحمان, رحیم نژاد, سمیرا, رحیم پور, رزاق, قربانی, فرشید, مهدی زادگان, بهادر,

Background and purpose: Biological monitoring for workers exposed to solvents includes complementary environmental monitoring which is useful in toxic chemical risk assessments. The aim of this study was environmental and biological monitoring of workers exposed to volatile organic compounds (VOCs) in petrochemical industry. Material and Methods: Air and urine samples were collected from 104 i...

2009
ANNA STOLARSKA KRYSTYNA PRZYBULEWSKA ANDRZEJ WIECZOREK

The effect of the ethyl benzene vapours in air at the concentration ranging from 81 to 6570 mg·m on the physiological response and anatomical changes of winter wheat seedlings, cv. “Tonacja” was examined. This effect, intensifying CO2 assimilation and increasing photosynthetic water-use efficiency, was observed at the lowest concentration. At the concentrations of 730 to 6570 mg·m, ethyl benzen...

امیدی, فریبرز, دهقانی, فاطمه, ذاکریان, سید ابوالفضل, منصورنیا, محمد علی, گلبابایی, فریده,

Introduction: Adverse effects of volatile organic compounds (VOCs) including general and specific effects like carcinogenic of benzene are well known. The aim of this study was to evaluate occupational exposure to BTEX compounds in the painting unit of an automotive industry and subsequently health risk assessment of exposure to these compounds. Material and Method: This cross-sectional stud...

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