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- Several diamines are building blocks for the synthesis of pharmaceuticals and agro-chemicals. Show how both 1,3-propanediamine and 1,4-butanediamine can be prepared from acrylonitrile.In preparation of p-Nitroaniline, Starting material is 50g of p-nitroacetanilide, 22ml of HCI, 20g of p-nitroaniline. Give % yield of nitro acetanilide.What is the percent yield of the hydroboration oxidation of 1-octene to form 1-octanol? Original amount of 1-octene added 840 uL 2 mL of 1M borane THF added For oxidation 1.2mL of 3M NAOH and 1.2 mL of 30% hydrogen peroxide 2 mL of diethyl ether used for extraction 5.11g obtained as final product.
- (a) Tsomane and Nyiko were given a task of synthesising methylenecyclohexane 2. After a brief discussion with each other, Tsomane proposed Method A to synthesise 2 from cyclohexanone 1 while Nyiko proposed Method B that started from hydroxymethylcyclohexane 3. Each student believed that their proposed method is better than the other. (Scheme below) (1) 1 Ph THF A Ph Ph B H₂SO4 100 °C 3 OH What is the name of the reaction that is followed by reaction Method A?10. M and N are amines with the molecular formula C3H»N. Reaction of M with sodium nitrite and HCI releases nitrogen gas and produces a mixture of X and Y and Propanol while N produces a yellowish oily compound, S when reacted with the same reagents. Give the structures of M, N, X, Y, and S. Outline the synthesis of M from a suitable alkene.8. Under anhydrous conditions, 4.8 mL of 1-bromo-3,5-dimethylbenzene (dens. 1.36 g/mL) is treated with 0.90 g of magnesium in 25 mL of diethyl ether. After the initial reaction, the ether solution is poured over 8.5 grams of dry ice (carbon dioxide). The mixture is then treated with 50 mL 1M aqueous HCl. The resulting biphasic mixture is transferred to a separatory funnel and the aqueous layer is removed. The organic layer that remains in the separatory funnel is then treated with 20 mL 3M aqueous NaOH. After shaking the separatory funnel and allowing the layers to separate, the aqueous layer is removed and treated with aqueous 6M HCl until a precipitate forms and the pH of the solution acidic by pH paper. The precipitate is isolated by vacuum filtration and allowed to dry resulting in 3.73 g of a white solid (m. p. 171.2 – 173.4 °C). Assuming the product is 3,5-dimethylbenzoic acid, calculate the percent yield. Br 1) Mg°, Et,0 ОН 2) CO2 3) H* 1-bromo-3,5-dimethylbenzene…
- Dimethyl disulfide, CH,S–SCH3, found in the vaginal secretions of female hamsters, acts as a sexual attractant for the male hamster. Write an equation for its synthesis from methanethiol.A student attempted to prepare 1-chlorobutane by mixing 1-butanol with NaCl in acetone. Was the student succesful? Explain.1. In the reactions involving the three isomeric alcohols with the formula C4H9OH, describewhat each of the following tests showed about reactivity of the -OH group and reactions of 1°,2°, and 3° alcohols.• the test with neutral KMnO4• the test with concentrated HCl2. Predict how the fourth alcohol with the formula C4H10O would react if tested with:• 0.01 M KMnO4• concentrated HCl at room temperatureExtend FurtherUse your observations of the solutions formed in the previous experiments and yourunderstanding of alcohols to complete a table like the one shown below. Research the meltingand boiling points to verify your answers.
- (a) Tsomane and Nyiko were given a task of synthesising methylenecyclohexane 2. After a brief discussion with each other, Tsomane proposed Method A to synthesise 2 from cyclohexanone 1 while Nyiko proposed Method B that started from hydroxymethylcyclohexane 3. Each student believed that their proposed method is better than the other. (Scheme below) (1) Ph Ph 8*8 Ph THF A 1 Santande B H₂SO4 100 °C 3 OH Using curly arrows, provide full mechanistic details accounting how methylenecyclohexane 2 was synthesised according to both Methods A and B.Benzene is often produced as a side product during Grignard reactions using phenylmagnesium bromide. How can its formation be explained? Give a balanced equation for its formation.Write an equation for the acid-base reaction between 2,4-pentanedione and sodium eth- oxide and calculate its equilibrium constant, K. The pK, of 2,4-pentanedione is 9; that of ethanol is 15.9. CH,CCHÖCH, + CH,CH,O Na* H 2,4-Pentanedione Sodium ethoxide