Catalysed bromination of aromatic substrates
01 Sep 1970-Vol. 72, Iss: 3, pp 144-148
TL;DR: In this article, the kinetics of bromination of anisole and a less reactive substrate like p-nitrophenol were investigated in acetic acid medium with iodine added to accelerate the reaction.
Abstract: The kinetics of bromination of a reactive substrate like anisole and a less reactive substrate likep-nitrophenol has been investigated in acetic acid medium with iodine added to accelerate the reaction. The effective catalyst has been shown to be iodine bromide. The experimental results obtained from a study of the phenomenon of catalytic maximum in these reactions are in good agreement with the theoretical expectations.
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TL;DR: In this paper, the role of pyridine (Py) in the bromination of p-bromophenol (ArH) in CCl4 has been investigated.
Abstract: The role of pyridine (Py) in the bromination of p-bromophenol (ArH) in CCl4 has been investigated. At constant concentrations of ArH and Br2, the rate of disappearance of Br2 increases to reach a limiting value as the concentration of Py is increased. The mechanism suggested to account for the rate expression, Rate = constant [ArH] [Br2]T[Py]T, obtained from the initial rate studies, involves the interaction between ArH and the brominating species Py. Br2, in the rate determining step. Py acts as a catalyst probably by virtue of its ability to polarise the Br-Br bond.
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TL;DR: A text-book of Practical Organic Chemistry including Qualitative Organic Analysis by Dr Arthur I Vogel as mentioned in this paper, intended as a comprehensive laboratory manual for students of organic chemistry, gives a full and valuable description of organic chemical technique, details of preparation of more than six hundred compounds, and a scheme of qualitative organic analysis.
Abstract: DR VOGEL‘S books on analysis are widely used in teaching practical inorganic chemistry His new volume is intended as a comprehensive laboratory manual for students of organic chemistry It gives a full and valuable description of organic chemical technique, details of preparation of more than six hundred compounds, and a scheme of qualitative organic analysis There are appropriate notes on the preparative reactions described and on the properties of the various classes of organic compounds A curious omission is the almost complete absence of reference to quantitative organic analysis It seems to the reviewer that some practice at least in quantitative elementary analysis is of value in the student‘s training, even in these days when the fully fledged organic chemist hands his analysis specimens to the microanalyst for determinations which he is usually quite unable to carry out himself A Text-Book of Practical Organic Chemistry Including Qualitative Organic Analysis By Dr Arthur I Vogel Pp xxiii + 1012 (London, New York and Toronto : Longmans, Green and Co, Ltd, 1948) 42s net
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