Activity of 4methylcyclohexene essay

Paper type: Science,

Words: 750 | Published: 12.03.19 | Views: 504 | Download now


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4-methylcyclohexanol was synthesized to 4-methylcyclohexene using dehydration. 4-methylcyclohexanol was heated to reflux and the subsequent distillate (4-methylcyclohexe) was accumulated. It was in that case purified applying sodium chloride to separate companies an desert solid was then added and strained. The resulting product a new mass of 0. 399 g and a percent yield of 41%. The product was favorably identified and characterized as 4-methylcyclohexene through IR and Br2 evaluation.


To synthesize 4-methylcyclohexene from 4-methylcyclohexanol the starting material can be dehydrated causing the desired compound.

For dehydration to be feasible the OH YEA group within the 4-methylcyclohexene need to first end up being converted into WATER by means of an acid-base response using a solid acid catalyst such as phosphoric acid and sulfuric acid solution. The INGESTING WATER will then end up being the favored giving group and leave itself resulting in the formation of a carbocation in excess normal water. The water will certainly remove the acidulent hydrogen within the carbocation producing the desired alkene as well as regenerating the acid catalyst (fig.

2). A moment effective method to collect the 4-methylcyclohexene should be to heat the response to reflux as it is going on.

This allows the item to be segregated from the beginning materials by using the cooking food point difference between the separated alkene (101-102 C) and the starting alcohol (171-173 C). After the distillate is collected any impurities of normal water and phosphoric acid can be extracted by adding sodium chloride, drying the resulting organic and natural layer with an anhydrous solid, and filtration. IR of both the starting alcohol plus the resulting alkene can be in comparison as a means of identification and characterization in addition to a Br2 test out to ensure the appropriate product was formed.

Procedure and Observations

An assortment of 4-methylcyclohexanol (1. 5mL), 85% phosphoric acidity (0. 40mL), and half a dozen drops of concentrated sulfuric acid were heated to reflux. The mixture switched a darkish upon reaction and darkened with exposure to heat. Initially the heating temperature come to 190C unfortunately he then lowered and preserved within the variety of 160-180C before the reaction blend stopped cooking. The causing distillate was collected and removed. The stillhead the distillate was collected in was in that case washed with sodium chloride (1. 0ml) and the succeeding mixture was added to the merchandise. This mix was shaken and aqueous and organic and natural layers were allowed to form. The aqueous layer was removed from the organic plus the organic dried with desert solid and filtered through a cotton-plugged pipet. The mass of the merchandise as well as a percent yield was determined. An IR was taken and compared to the beginning material as well as a Br2 test.

Results and Calculations

4-methylcyclohexanol starting mass: 1 . 164 g

actual 4-methylcyclohexene mass: zero. 399 g

4-methylcyclohexanol molecular weight = 114 g/mol

4-methylcyclohexene molecular weight = 96 g/mol

Percent yield measurements:

% yield sama dengan (actual yield/ theoretical yield) * fully

1 ) 164 g 4-methylcyclohexanol 2. 1mol 4-methylcyclohexanol/114 g 2. 1 mol 4-methylcyclohexanol/ you mol 4-methylcyclohexene * 96 g/ one particular mol 4-methylcyclohexene = 0. 980 g 4-methylcyclohexene (theoretical yield) 0. 399 g/ 0. 980 g = 0. 407 * totally = forty. 7% sama dengan 41%

Br2 test:

4-methylcyclohexene: 150 drops to reach excess

4-methylcyclohexanol: 1 drop to get to excess

Discussion and Realization

In conclusion, 4-methylcyclohexene was efficiently synthesized by way of dehydration from 4-methylcyclohexanol. This kind of result was verified by comparing the IR spectra of equally compounds along with by executing a Br2 test. The IR spectra for the synthesized material lacked the broad O-H peak present in the spectra of the starting material and which is characteristic of a chemical substance containing an alcohol along with containing highs for both sp2 and sp3 hybridized C-H groupings, both of which can be consistent with the stereochemistry of 4-methylcyclohexene.

Moreover, the results in the Br2 test supported the positive characterization with the product while 4-methylcyclohexene. 140 drops Bromine were required until the substance turned reddish consistent with the hormone balance of Bromine and the alkene forming 1, 2‐dibromo‐4‐methylcyclohexane and explaining why the combination remained clear for so long. The product was synthesized with a to poor percent deliver as proved by the 41%. This poor yield very likely was caused by the excess high temperature initially added to the reflux reaction, the result of which was charring and possibly simply by too much acidity catalyst becoming added to the starting material.


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