Introduction to Organic Chemistry Essay Example for Free

Introduction to Organic Chemistry Essay Amines are compounds composed of nitrogen atoms bearing alkyl or aromatic compounds. Amines undergo interesting reactions, one of which is with the reaction with nitrous acid producing an azo dye. In this study, the experiment focused on synthesizing an observing the physical properties of Sudan-1. Sudan-1 is of the most common dyes found in waxes, oils and in some food ingredients specifically curry and chilli powder. Furthermore, this study aimed to understand the mechanism behind the synthesis of 1-phenylazo-2-naphtol. To be able to synthesize Sudan-1, preparation of phenyldiazonium chloride solution and ÃŽ ²- naphthol solution were done. Ingrain dyeing was also done in this experiment. The synthesis of Sudan-1 has a two-step reaction – diazotization and coupling reactions. Diazotization is the formation of diazonium salt, meanwhile, the coupling reaction took place when an activated aromatic compound, ÃŽ ²-naphtol was reacted with the diazonium salt, benzene diazonium chloride, to form the azo compound known as the 1-phenylazo-2-naphthol. As a result, an orange-red precipitate was formed after series of reaction. Hence, all the said objectives in this experiment were achieved. Amines are compounds that are composed of a nitrogen atom bearing alkyl or aromatic groups. They are basic and nucleophilic because of their lone pair. They occur both in plants and animals. Amines produces some of the most interesting effects and of the common reaction of aminewith nitrous acid producing a dye[4]. Alizarin, for example is a red dye extracted from madder root used by Egyptians and Persians. However, in this experiment, it aimed to produce a dye commonly known as Sudan-1. Sudan-1 is a lysochrome with the chemical formula 1-phenylazo-2-naphthol. It is a powdered substance with an orange-red color. This azo dye is most commonly found in waxes, oils, and also in some food coloring ingredients – curry powder and chili powder. However, the presence of Sudan-1 in most foods now is currently being banned because it has been classified to be carcinogenic. This experiment focused on synthesizing of 1-phenylazo-2-naphthol which is a two-step reaction. The first reaction is the reaction of aniline with nitrous acid, which is called diazotization and second, the reaction of diazonium salt and beta-naphtol to form azo dye which is the coupling reaction. Figure 1 Diazotization Reaction of Aniline to Produce a Diazonium Salt Figure 1 Diazotization Reaction of Aniline to Produce a Diazonium Salt In diazotization reaction, there is a formation of diazonium salts. This reaction is made possible when a primary aromatic amine is treated with nitrous acid. Then in coupling reaction, the electrophilic substitution reaction of a diazonium salt with an activated aromatic ring formed a azo compound specifically an azo dye.[3] The main objective of this study was to be able to synthesize Sudan-1. Also, it aimed to characterize the azo dye with its most distinguishing physical properties. Furthermore, this experiment also aimed to understand the mechanism behind the synthesis of Sudan-1. Figure 2 Coupling Reaction of Benzene Diazonium Chloride with ÃŽ ² -Naphthol Figure 2 Coupling Reaction of Benzene Diazonium Chloride with ÃŽ ² -Naphthol Aniline was reacted NaNO2 crystals under acidic condition using HCl in a cold temperature. The solution was done in a very cold temperature because the phenyldiazonium intermediate easily decomposes back to its aniline counterpart at a slightly high temperature; hence the temperature of the solution was maintained in an ice bath below 5Â °C. Rock salt may also be added to the ice bath to maintain the temperature. However, in this experiment, no rock salts were added instead constant monitoring of the temperature was done. ÃŽ ²-naphthol solution was used as a coupling reagent in synthesizing Sudan-1. In preparing ÃŽ ²-naphthol solution, ÃŽ ²-naphthol was dissolved in 5% of aqueous NaOH and was also cooled in an ice bath below 5Â °C, this was to avoid the decomposition of the compounds. The main reaction that occurred in the preparation of phenyldiazonium chloride solution was diazotization reaction. Diazotization is the reaction between a primary aromatic amine and nitrous acid at cold temperatures to diazonium salt compound.[2] Figure 1 below is the reaction exhibited by the phenyldiazonium chloride solution. As this experiment aimed to synthesize Sudan-1, two steps are done. The first step would be the reaction of a primary aromatic amine to produce a diazonium salt as seen in Figure 1. The second step, then, is the reaction of the diazonium salt with a strongly activated aromatic syste,l known as coupling reactions. Azo coupling is the reaction between a diazonium compound and aniline, phenol or other aromatic compound which produces an azo compound.[5] In this experiment ÃŽ ²-naphthol couples with the diazonium salt. Figure 2 below shows the coupling reaction of the benzene diazonium chloride with ÃŽ ²-naphthol and having the product of Sudan-1. Furthermore, figure 3 below is the summary of reactions of the synthesis of Sudan-1 in this experiment. Figure 3 Summary of Reactions in Synthesizing Sudan-1 Figure 3 Summary of Reactions in Synthesizing Sudan-1 In this experiment, a filter paper was used to undergo ingrain dyeing. Ingrain dyeing is an irreversible chemical reaction of the diazonium salt solution and the activating aromatic solution. An orange-red filter paper was produced after such procedure. The presence of orange-red color in filter indicates the presence of the azo dye (see appendix for the orange-red filter paper produced). The Sudan dye is synthesized right in the spaces between the filter paper such that they are permanently trapped inside the fiber spaces of the filter paper.[2] After mixing the phenyldiazonium chloride solution with the ÃŽ ²-naphthol solution, an orange-red paste-like solution was formed. Furthermore, the mixed solution was also reacted at a temperature not exceeding 4ËšC for 1-5 minutes. Afterwards, the mixture was also filtered was washed with several portions of water to filter the product, Sudan-1. Recrystallization was also done when the filtrate was steamed bath after dissolving it with 95% hot ethanol. AS a result, orange-red crystals were formed which is the Sudan-1 product. The crystal appeared to be orange-red in color due to the N=N bond present in Sudan-1. The N=N is responsible for the absorption of light thus reflecting a color which is orange-red. The structure of Sudan-1 is shown in Figure 4 below showing the N=N bond of the compound. The N=N is known as the chromophores which are responsible for the color. The –OH group attached in the structure is also responsible for enhancing the orange-red color. The –OH functional group is known as the auxochrome, which modifies the ability of the chromophore to absorb the light.[1] Figure 4 Structure of Sudan-1 Azo-compounds, compounds with general formula Ar-N+=N-Ar-, are coupling products from the reaction of diazonium salts with amines. The general reaction pattern for Sudan synthesis first undergoes diazotization reaction and then coupling reaction with highly activated aromatic compounds. In this experiment, the diazotization reaction of aniline with NaNO2 and HCl yielded a diazonium salt, benzene diazonium chloride. Furthermore, the diazonium salt then underwent coupling reactions with an activated aromatic ring which is ÃŽ ²-naphthol. The coupling reaction yielded an azo compound which is most commonly known as the Sudan-1 with an IUPAC name of 1-phenylazo-2-naphthol. As a result of the reactions in this experiment, an orange-red color of solution was produced. This experiment aimed to understand the reactions that underwent to synthesize Sudan-1; as a result, figure 3 was the summary of reactions. As a physical result, orange-red colored crystals were produced representing the azo compound, Sudan-1. However, some minor errors will not be ignored in this experiment. Some errors like human errors might have affected the results in yielding a pure azo compound. One human error, would be the measuring of the reagents used to yield the said product. Also, the misreading of some measurements may have also affected the results of this experiment. Also, some impurities in the chemicals used will also not be ignore, since this impurities may have led to a not so visible side reactions in the said experiment. After being said and done, all the said objectives in this experiment were met.

Robert Altmans Nashville Essay -- essays research papers

Nashville Essay Robert Altman’s movie Nashville is based on the political, social, and personal problems that our country has to deal with. These problems are rooted in the battle between the need to create some false image of success and the need for truth which is the struggle that exists in every character of this film (except Jeff Goldbloom). To show this Robert Altman takes us through Nashville’s Country Music using political commentary, music and realistically portrayed dialogue to tell the story. Altman portrayed politics as sort of a parasite feeding off of the Nashville dream. He used acousmatic sound in two ways to portray these parasitic politics. The first way is the use of the Hall Walker van which was an almost a surreal narrator between scenes. This provided a point of view of what should or should not be done politically. An example of this would be when the van is talking about health care as they show Barbra Gene sitting in her hospital bed with all the flowers and what not as if to set up an outside view of the situation. The second way acousmatic sound was used in this political manner was through TV and Radio. Instead of this providing a point of view or an opinion it acted as an informer of the present situation that was undergoing at the time, for example the news casters commenting on Barbra Gene’s collapse at the airport, or when Barbra Gene is in her hospital bed listening to her replacement, Connie White, sing at the Grand Old Opry. The function...

Dowry Problem in India Essay

Gandhi ji said:- ‘Any young man who takes dowry fo getting married , disrespects his education, country and womanhood.’ Our society is full of evil systems. One of those evil systems is dowry. Dowry is defined as the ‘price paid by parents to get their daughters married as well for getting them the place in the family which they deserve.’ Over the years cases of dowry harassment and cases of dowry deaths have multiplied. In Hindu marriage system, a system termed as ‘kanyaddan’ is performed in which the bride is given to the husband and in-laws along with huge sums of money, furniture, house, car, etc. or more precisely bride along with dowry. The dowry system has converted something as pure as marriage into a business transaction and the bride into a saleable commodity or a key to more money. Debts are taken so that the groom’s family can be provided with a large dowry. This creates a burden on the bride’s family. Girls begin to think of themselves as a burden on their families and accept spinsterhood as their fate or commit suicide. Dowry has also led to an increase in female feticide and female infanticide which has greatly affected the male-female ratio in the country. Heavy dowry is demanded for educated boys. This has ruined the lives of many brilliant girls. Brilliant, educated and economically independent girls cannot get married to so-called educated boys because their parents cannot provide their in-laws with a huge dowry demanded by them. Even after marriage such girls are tortured to bring in more money, and ultimately, they either commit suicide or lose their mental balance. People who believe in taking dowry say that dowry acts as a financial help to the newlyweds. They say that while marriage acts as a life insurance for girls, marriage acts as its premium. They also say that a girl who carries a respectable amount of dowry to her husband and in-laws feels confident while a girl who carries a less amount of dowry feels uncomfortable and apprehensive. In 1961, the government passed the Dowry Prohibition Act to abolish the dowry system. However, this act, instead of subsiding dowry, took its roots to a deeper level in the society. It is said that on an average one woman is being killed in every four hours n the issue of dowry in India. However, strong public rejection is being noticed on the issue of dowry among the youth. They are not ready to give or take dowry for getting married. They are really coming forward to abolish the evil. Our society  needs such responsible youth to abolish the evil system of dowry in India. There is finally a positive beam of light shown in utmost darkness, but to convert this positive beam of light into utmost lightness, we, the common people of India have to take effective remedial steps: – We should start a strong propaganda to abolish the evil. People should make demonstrations against those who take dowry. Strict laws should be passed to prohibit taking and giving dowry. Young girls should take serious action when their family is demanded with dowry. Proper education should be imparted to girls as well as they should be made economically independent to accelerate the process. Love marriages, inter-caste marriages as well as inter-provisional marriages may also help. Cases of â€Å"dowry free† marriages should be the news item on the bulletin. This will encourage the youth. Right now, in our society, a man who does not marry for love, learns to marry for possessions. We have to change the picture. â€Å"SAY NO TO DOWRY†

America’s Shame the Chronicle of Higher Education Essay

Poverty is unfortunately a worldwide issue. What responsibility do we have to help the rest of the world with their issues of poverty, as well as our own? If we honestly think about reducing poverty, how will the world benefit? How will the US benefit? Peter Singer is the author of the article â€Å"America’s Shame: The Chronicle of Higher Education. He completed this article on May 13, 2009. The authors intention is to show Americas true and current role, as a developed country, in the decline of poverty. Per Singer (2009), Education seems to be the key to eradication of poverty. I have in mind a broad re-envisioning of what we teach. He is of the opinion that every educational course should focus on a particular global problem. Singer†¦show more content†¦In 2007, Unicef announced that, for the first time since record keeping began, the number of deaths of young children had fallen below 10 million a year. Public-health campaigns against smallpox, measles, and mala ria have contributed to the drop in child mortality, as has economic progress in several countries. The decline is even more impressive because the worlds population has more than doubled since 1960. Impression 4 Emotion and Fact Singer (2009) There is mistaken belief that a country like the U.S provides a lot of aid that is a percentage of national spending when in real sense the amount of Government spending that goes to aid is about one 1%. Moreover, the majority of U.S. aid is not directed to helping the extremely poor. Only about a quarter of U.S. aid goes to countries classified by the OECD as least developed. The leading recipients of official aid are Middle Eastern countries due to war on terror or help to stabilize that part of the world. Impression 5 Emotional and Fact Governments and state agencies need to be more concerned in the obliteration of poverty through providing foreign aid. 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