effects of solvents polarity parameters on heterogeneous catalytic hydrogenation of cyclohexene in molecular solvents

نویسندگان

mohammad khodadadi-moghaddam

faramarz sadeghzadeh darabi

چکیده

heterogeneous catalytic hydrogenation of cyclohexene, catalyzed by pt/a1203, was carried out in thirteenvarious solvents (four alcoholic solvents, six aprotic polar solvents and three non polar solvents) at 25 °c.single-parameter correlations of logk vs. normalized polarity parameter (etn), hydrogen-bond acceptorbasicity (p), hydrogen-bond donor acidity (a) and dipolarity/polarizibility (it*) do not give acceptableresults. in addition, logk does not show an acceptable dual-parameter correlation with etn and a, etn and13, etn and it, a and [3, a and 7t* and p and it. like that, three parameter and four parameter correlationsof log k vs. solvatochromic parameters don't give acceptable results. correlations of log k vs. acceptornumber (an), donor number (dn), relative static permittivity (a) and dipole moment (μ) are tested butdon't give reasonable results. however in case of alcoholic solvents, reaction rate constants increase withincreasing of hydrogen-bond donor acidity (a), dipolarity/polarizibility (e), normalized polarityparameter (etn), relative static permittivity (c), dipole moment 0.0 and acceptor number (an) anddecrease with increasing of hydrogen-bond acceptor basicity (f3) and donor number (dn). these effectsare attributed to the non-polar nature of the reactant and competitive adsorption of solvent on catalystsurface.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Effects of solvents polarity parameters on heterogeneous catalytic hydrogenation of cyclohexene in molecular solvents

Heterogeneous catalytic hydrogenation of cyclohexene, catalyzed by Pt/A1203, was carried out in thirteenvarious solvents (four alcoholic solvents, six aprotic polar solvents and three non polar solvents) at 25 °C.Single-parameter correlations of logk vs. normalized polarity parameter (ETN), hydrogen-bond acceptorbasicity (p), hydrogen-bond donor acidity (a) and dipolarity/polarizibility (it*) d...

متن کامل

On the catalytic activity of cluster anions in styrene hydrogenation: considerable enhancements in ionic liquids compared to molecular solvents

Many low oxidation state transition metal (carbonyl) clusters are salts and are highly soluble in ionic liquids. Since many are also effective catalysts/precatalysts for hydrogenation reactions, we have conducted a catalytic study of these compounds in ionic liquids and found that the activity of certain clusters to hydrogenate alkene substrates, when immobilised in ionic liquids, is up to 3.6-...

متن کامل

Effects of deep eutectic solvents in preparation of nanoparticles TiO2

Deep eutectic solvents (DESs) have always been attractive to scientists due to their wide range of applications, a great interest in diverse fields including nanotechnology due to their unique properties as new green solvents. It used large-scale for chemical and electrochemical synthesis nanomaterial. DESs have had also active role in improving the size and morphology of nanomaterial during sy...

متن کامل

Effects of deep eutectic solvents in preparation of nanoparticles TiO2

Deep eutectic solvents (DESs) have always been attractive to scientists due to their wide range of applications, a great interest in diverse fields including nanotechnology due to their unique properties as new green solvents. It used large-scale for chemical and electrochemical synthesis nanomaterial. DESs have had also active role in improving the size and morphology of nanomaterial during sy...

متن کامل

the effects of high non fibrous carbohydrates diet on milk production, inflammation and molecular mechanism of innate immunity in lactating dairy cows

پژوهش حاضر با هدف بررسی اثر جیره حاوی کربوهیدراتهای غیرالیافی زیاد و بروز التهاب در گاوهای شیرده در دو آزمایش جداگانه انجام شد. در آزمایش اول 20 رأس گاو مبتلا به ورم پستان از دو گروه کم تولید و پرتولید (هر کدام 10 رأس) و 20 رأس گاو سالم از دو گروه کم تولید و پرتولید (هر کدام 10 رأس) انتخاب شدند. همه گاوها در دوره دوم و یا سوم شیردهی و در روزهای 80-120 پس از زایش بودند. میانگین تولید شیر در گروه...

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
journal of physical & theoretical chemistry

ISSN

دوره 8

شماره 1 2011

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023