SciELO - Scientific Electronic Library Online

 
vol.64High school Physical Sciences teachers' competence in some basic cognitive skillsDSC of milk fats from various animals with high levels of medium-chain, unsaturated and polyunsaturated fatty acids índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Articulo

Indicadores

Links relacionados

  • En proceso de indezaciónCitado por Google
  • En proceso de indezaciónSimilares en Google

Compartir


South African Journal of Chemistry

versión On-line ISSN 1996-840X
versión impresa ISSN 0379-4350

S.Afr.j.chem. (Online) vol.64  Durban  2011

 

RESEARCH ARTICLE

 

Kinetics of oxidation of aliphatic alcohols by potassium dichromate in aqueous and micellar media

 

 

Mohammed HassanI, *; Ahmed N. Al-HakimiI; Mohammed D. AlahmadiII

IDepartment of Chemistry, Faculty of Science, Ibb University, Ibb 7027, Yemen
IIDepartment of Chemistry, Faculty of Education, Aden University, Aden, Yemen

 

 


ABSTRACT

The kinetics of oxidation of four aliphatic alcohols in acidic aqueous and micellar media were investigated. The reaction was found to be first-order with respect to both alcohol and oxidant. Pseudo-first-order kinetics were found to be perfectly applicable with ethanol, 1-propanol and 2-propanol while deviation was observed at intermediate stages of the reaction with methanol. The pseudo-first-order rate constants were found to be independent of concentration of the oxidant. The presence of TX-100 enhanced the rate of the reaction for all alcohols. Negative salt effects were observed with addition of KCl to the reaction mixture. A suitable mechanism for the reaction was suggested which agrees with the experimental findings.

Keywords: Oxidation, dichromate, alcohol, pseudo-first-order, micellar effect


 

 

Full text available only in pdf format.

 

 

References

1 M. Baghmar and P. Sharma, Proc. Indian Acad. Sci. (Chem. Sci.), 2001, 113, 139-146.         [ Links ]

2 D. Mahadevappa and H. Naidu, Australian Journal of Chemistry, 1974, 27, 1203-1207.         [ Links ]

3 E. Beniso and E. Rodenas, Transition Met. Chem., 1993, 18, 329-334.         [ Links ]

4 K. Sengupta, T. Samanta and S. Basu, Tetrahedron, 1986, 42, 681-685.         [ Links ]

5 C. Bunyakan, T. Akuru, and J. Chungsiriporn, PSU-UNS International Conference on Engineering and Environment, 2005, Novi Sad, Serbia, pp. 1-4.         [ Links ]

6 M. Ghiaci, R. Kalbasi and M. Sedaghat, Org. Process Res. Dev., 2003, 7, 936-938.         [ Links ]

7 P. Heinstra, G. Thorig, W. Scharloo, W. Drenth and R. Nolte, Biochem. Biophys. Acta, 1988, 967, 224-233.         [ Links ]

8 J. March, Advanced Organic Chemistry, Wiley, Singapore,1999, p. 1196.         [ Links ]

9 S. Meenakshisundaram and R. Vinothini, Croat. Chem. Acta, 2003, 76, 75-80.         [ Links ]

10 K. Sathiyanarayanan, C. Pavithra and Chang Woo Lee, J. Ind. Eng. Chem, 2006, 12, 727-732.         [ Links ]

11 M. Pandeeswaran, B. John, D. Bhuvaneshwari and K. Elango, J. Serb. Chem. Soc, 2005, 70, 145-151.         [ Links ]

12 H.A. Medein, Z. Naturforsch. 2003, 58b, 1201-1205.         [ Links ]

13 K. Mallick, S. Jewrajka, N. Pradhan and T. Pal, Curr. Sci., 2001, 80, 1408-1412.         [ Links ]

14 Kabir-ud-din, A. Morshed and Z. Khan, Inorg. React. Mech., 2002, 3, 255-266.         [ Links ]

15 S. Patil, Y. Katre and A. Singh, Colloids Surf. A, 2007, 308, 6-13.         [ Links ]

16 K.J. Laidler, Chemical Kinetics, Pearson Education, Singapore, 1987, p. 197.         [ Links ]

17 S. Patwari, S. Khansole and Y. Vibhute, J. Iran. Chem. Soc., 2009, 6, 399-404.         [ Links ]

 

 

Received 22 October 2010
Revised 10 October 2011
Accepted 2 November 2011

 

 

* To whom correspondence should be addressed. E-mail: abuusef2002@gmail.com

Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons