Lab 8 CHEM233

What factors during the experiment caused the percent yield to be different than 100%? What impurities may be present in the final product (look at the spectroscopic data for evidence of this), and how does that effect the percent yield calculation? I got 64% for the percent yield.

please answer the question based on the information below  Why is toluene used as the solvent for the recrystallization here?     Day 2: Recrystallization and analysis of the o-chlorobenzoic acid Recrystallize the product using hot toluene. Be sure to add enough toluene so that the solid dissolves at a higher temperature, but some of the solid stays undissolved at room temperature. Do not add too much toluene, as you may not be able to crystallize your product. If you believe you added too much toluene, or if o-chlorobenzoic acid crystals do not appear upon cooling the solution on ice, you will need to evaporate some of the toluene in the hood. The crystals should be suspended fully in toluene before filtration. After drying the solids, determine the melting point of the product. Acquire the infrared spectrum and the 1H-NMR spectrum in DMSO-d6. Cleanup Notes: Solid MnO2 often sticks to the glassware and is difficult to remove, even with soapy water and scrubbing. You can easily clean…

Aqueous hydrochloric acid was used after the sodium bicarbonate and sodium hydroxide extractions in the separation scheme shown in Figure 12.10. Is it possible to use this reagent earlier in the separation scheme to achieve the same overall result? If so, explain where you would perform this extraction.

6) During the Wittig reaction, you perform the reaction as follows:4-chlorobenzaldehyde (136 mg) and (carbethoxymethylene)triphenylphosphorane(323 mg) were placed in a 25 mL Erlenmeyer flask. The two solids were mixed vigorously for 15 min. The reaction mixture was diluted with hexanes (2.9 mL - density 0.661 g/mL) The by-product, triphenylphosphine oxide, was filtered off.0.085 g total of triphenyl phosphine was isolated. The filtrate was then evaporated to dryness to obtain 0.151 g of the desired product, pure ethyl-4-chlorocinnamate, as a colorless oil.What is the % effective mass yield of the reaction? (Your result should be reported as a % value and rounded to the nearest integer.

Table 1. The Reagents used in Experiment 11 Compounds and Reagents cyclohexanol Amount mmol bp (°C) density (g/mL) 0.96 1.88 1.84 0.81 MW (g/mol) 100.16 8 mL 97.99 2.5 mL H3PO4 (concentrated) H₂SO4 (concentrated) 98.08 5-8 drops cyclohexene 82.14 ? 162 158 337 83 Show Transcribed Text How do we solve for the question mark in the table?

A Grignard reaction of phenylmagnesium bromide with 3-pentanone gives 3-phenylpentan-3-ol as the major product. The crude product contains the 3-phenylpentan-3-ol product, unreacted 3-pentanone, and biphenyl (a side product). A developing solvent is found that separates the mixture into three spots on a silica gel TLC plate. Considering the functional groups present, predict which compounds would have the smallest and largest Rf values. Briefly justify your answer.

Using aqueous hydrochloric acid, sodium bicarbonate, or sodium hydroxide solutions, devise a separation scheme using the style shown in Figure 12.10 to separate the following two-component mixtures. All the substances are soluble in ether. Also indicate how you would recover each of the compounds from its respective salts.

Draw a flowchart showcasing the purification step done for the reaction under basic conditions (the basic reaction of 4-methoxyacetophenone with bleach, sodium hydroxide, and acetone), starting from the crude reaction mixture all the way to the isolated solid product. Assume for this drawing that the reaction was complete, and that none of the intermediates are found in the crude mixture. There may still be however traces of your starting material in the crude mixture, along with any excess reagents

The question is:    Consider a mixture containing 0.5 benzil and 0.05 biphenyl. Your task is to isolate the benzil in pure form. Would this be best accomplished by recrystallization or extraction?  I don’t really know which one would be better cause both can isolate a substance in its pure form. Thanks!

Which of the following is/are NOT true regarding the synthesis of tert-butyl chloride? I. NaCl is used to minimize the solubility of the organic product in aqueous solution. II. Aqueous NaHCO3 is used to introduce water to the product. II. NAOH can used as substitute to NaHCO3 since both can neutralize the excess acid. IV. Drying the alkyl halide using anhydrous CaCl2 should be done after simple distillation. O a. Tonly O b. I and II O c. Il and II O d. II, II, and IV

4. Imagine you performed the following extraction steps on a solution of salicylic acid and (R)-carvone in ethyl acetate. Draw the structure of salicylic acid and (R)-carvone after each step and predict the layer (organic or aqueous) it will be found in. OH OH salicylic acid (R)-carvone a. The solution of salicylic acid and (R)-carvone in ethyl acetate is washed with water. b. The organic layer from part a is washed with aqueous sodium hydroxide. c. The aqueous layer from part b is neutralized by adding sulfuric acid. Then it is extracted with ethyl acetate.

This experiment is the Separation of a mixture of 3-nitroaniline, Benzoic acid, and naphthalene using an acid-base separation extraction technique   What properties of the three compounds in this experiment allow you to use the above technique to separate them?Why are you asked to use multiple portions of the solvent at the extraction steps?Why are you asked not to discard any solvents until you have obtained your products?

URGENT HELP PLEASE (this is not an exam question) 1-Bromobutane was hydrolysed by an aqueous sodium hydroxide (NaOH) solution.            CH3CH2CH2CH2Br     +    NaOH      →       CH3CH2CH2CH2OH       +      NaCl             1-Bromobutane                                              Butan-1-ol    During the reaction, the reactant sodium hydroxide is used up. Samples of the reaction mixture were drawn off at regular time intervals and analysed by titration with standard sulfuric acid to find out the concentration of sodium hydroxide.           The results are given in the table below:  Time / s  Concentration of OH-   / mol dm-3  0  0.500  100  0.350  200  0.250  300  0.180  400  0.125  500  0.090  600  0.063  700  0.040  800  0.030  Plot a ‘concentration of OH- (mol dm-3) against time (s)’ graph using the results given in the table above. Label the vertical and horizontal axes of the graph and include the unit/s.  Select 4…

Dehydration of 2-methylcyclohexanol

15. Please help me answer this organic chemistry question

che use 5-1). Also answer the following questions: 1. A student obtained a melting point of 52-55°C for their diphenylacetylene product. Is their compound pure? If not, then propose a method to purify this compound. the purity of the

1) Based on the Material Safety Data Sheets (MSDS) for the compounds, which of the compounds in this experiment is the most hazardous, and why (you have been given a representative aryl halide rather than all of the alkenes – as the products are all new, there’s not a simple answer to gauge their potential hazard)?  2,3-dihydrofuran,2-Mercaptobenzimidazole,Selectfluor, Dimethylformamide,dichloromethane-methylene chloride.

Eugenol is a natural product derived from the dried flower buds of the evergreen tree, Eugenia aromatica. Briefly describe a procedure with reagents required to extract eugenol as a single component from the mixture of compounds present in these flower buds. OH LOCH 3 eugenol

Reaction of benzaldehyde with formaldehyde in basic medium is called crossed cannizzaro reaction. Answer true or 2 false Cuprous chloride solution needed for sandmeyer reaction is made from CuC12 in water and Conc. HCI. Warming diazonium salt in the presence of water yield phenol. The reaction of a carboxylic acid and alcohol in the presence of sulfuric acid, which act as catalyst is called Hoffman esterification Dean-stark trap used to remove water and increase the yield during the preparation of ester. Aliphatic halides react slower with Mg than aromatic halides. Benzoin give positive test with Fehling's reagent. Solubility of aniline in water can be decreased by the addition of salt. Light and Hydrogen donor compound, reduces benzophenone to benzopinacol. NO2 gas was evolved during reaction of diazonium salt with cuprous chloride. Cuprous chloride solution needed for sandmeyer reaction is made from CuCl2 in water and Conc. HCI.

in the reaction of butyric acid +methanol = Methyl butyrate.

Please identify compound 1 and compound 2!!! Attached is the H-NMR and IR for both compounds (ignore the IR peaks ~2400).  The experimental melting point for the aqueous layer was 260-261 celcius. The experimental melting point for the organic layer was 76.9-78.7 celcius.  The following was my procedure: IntroductionThe reaction mixture in this experiment contains 4-bromobenzaldehyde, methanol, and aqueous potassium hydroxide. A reaction occurs that produces two organic compounds, compound 1 and compound 2. Both are solids at room temperature. Your task is to isolate, purify, and identify both compounds. A specific procedure is given for preparing the compounds, but you will need to work out the procedures for most other parts of this experiment.Experimental ProcedureThis procedure should produce enough of each compound to complete the experiment; however, in some cases, it may be necessary to run the reaction a second time. Although this experiment can be done individually, it works…

When ionic bromination of cyclohexene is carried out, the product is trans-1,2-dibromocyclohexane. Gas chromatographic analysis with a heated injection port can result in the elimination of Br2 from the dibromo product to regenerate the starting alkene. Thus, the GC properties of both the starting material and the adduct are of interest. Predict the relative retention times of cyclohexene and trans-1,2-dibromocyclohexane on a nonpolar column.

Please answer this NEATLY, COMPLETELY, and CORRECTLY for an UPVOTE. 1-butanol, 2-butanol, and diisopropyl ether all tested negatve (immiscible) in the solubility test with concentrated H2SO4. Considering the structure of the compounds, what generalization can be made for a substance to be soluble in concentrated H2SO4?