8-dibromo-2-(4-chlorophenyl)quinazolin-4-yloxy)methyl)-5-methyl-1‚3‚4-oxadiazole (IX) : A mixture of the hydrazide VII (0.01 mol) and acetic anhydride (30mL) was refluxed for 6h. The precipitated solid formed upon cooling‚ was filtered and recrystallized from ethanol‚ m.p. 155oC‚ 80% yield. Analysis calculated for C18H11Br2ClN4O2; Calcd.: %C‚ 42.34; H‚ 2.17; N‚ 10.97‚ Found: % C‚ 42.30; H‚ 2.14; N‚ 10.90. IR: υmax./cm-1 3000 (C-H aromatic)‚ 1610 (C=N) and at 1600 (C=C). 1H-NMR (DMSO-d6‚ ppm): δ 2.6 (s‚ 3H‚ CH3)
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Objective To synthesis methyl orange by coupling diazotised sulphanilic acid with N‚N-dimethylaniline. Materials (Chemicals) Sulfanilic acid‚ 2.5% aqueous sodium carbonate solution‚ sodium nitrite‚ concentrated hydrochloric acid‚ N‚N-dimethylaniline‚ glacial acetic acid‚ 10% aqueous sodium hydroxide‚ saturated sodium chloride solution Apparatus 50 mL Erlemeyer flask‚ 250 mL beaker‚ test tube‚ hot plate‚ Buchner funnels Procedure In a 50 mL Elermenyer flask 1.2 g of sulfanilic acid and
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The purpose of this experiment is to synthesize isopentyl ester by an esterification reaction between a carboxylic acid and an ester. Carboxylic esters‚ like isopentyl acetate‚ are normally used to create artificial flavors. In the preparation of isopentyl acetate‚ esterification of acetic acid and isopentyl alcohol occurs. Esterification is an equilibrium shift to the product side using an excess of one of the starting components. In this experiment‚ the excess reagent is acetic acid because it
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synthesize methyl benzoate form benzoic acid and methanol by using the Fischer esterification method. The Fischer exterification technique is utilized in the academic and industrial settings due to the simplified synthesis and safety parameters of the overall reaction. Both benzoic acid and methanol are relatively cheap to obtain from a commercial source as well as being easy to store with a relatively long shelf life. The Fischer esterification method is a fundamental and important synthesis process
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Introduction Esters are in a lot of natural products like flowers‚ spices and fruits. They are usually used in artificial flavorings. Carboxylic esters help amplify the sensory effect of esters. Isopentyl acetate is made from the direct esterification of acetic acid and isopentyl alcohol. The direct esterification of acetic acid and isopentyl alcohol is an equilibrium reaction that shifts the product to the side by using the excess of one of the starting reagents. Acetic acid usually used in excess
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The mean TAN levels in the present study in all the sampling stations were below the recommended level of 0.1 to 1.0 mg/L prescribed by Boyd (1990). However‚ when the level recommended (< 0.2 mg/L) by Chavez (2009) is taken as a standard‚ it was found to that 35% of the study period‚ TAN levels were above the acceptable limit in the feeder canal and the pond 3. Ferreira et al. (2011) has recommended 0.2 mg/L as the acceptable level of TAN for the culturing of L. vannamei. Though the mean TAN levels
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: Lord Zoe S. Alforja Submitted To : Ms. Laurice Anne Iglesia Schedule : Friday 4:00-7:00 Date : March 21‚ 2014 1. BASIC OUTPUT Construct an assembly language program that will show your name‚ your academic year and field of study‚ the name of your school on screen and your mobile number. SOURCE CODE : TITLE project1.ASM DOSSEG .MODEL SMALL .STACK 0100h .DATA namename DB 0Ah‚ 0Dh‚"Lord Zoe S. Alforja"‚0Ah‚ 0Dh‚"$" yearcourse DB 0Ah‚ 0Dh‚"2nd Year - Computer
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constitution shown has been isolated from horse chestnuts. It is configurationally related to L-proline and has the R configuration at C-3. Write a stereochemically correct representation for this compound. The addition of carbene by the cuprous chloride catalyzed the decomposition of diazomethane to 3‚4-dehydro-l-proline‚ which led to a combination of cis-3‚4-methylene-l-proline and trans-3‚4-methylene-l-proline in a proportion of 1:3.5. In addition‚ the cis amino acid was the same as the natural
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L.L.Bean’s focus on the customer led the company to develop information management systems that provide their customers with best-in-class shopping experiences. From easy access to available products‚ irrespective of its disposition within the supply chain‚ to fast and free shipping‚ L.L.Bean is a standout amongst its peers (“#3 Google”‚ 2015). L.L.Bean’s recognition is no coincidence‚ as the company has worked tirelessly to build upon their purpose as defined by Lean Leonwood Bean a century before
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Quals Direct Knowledge Task Generated on 02/03/2015 Dip L.2 HSC 025 The role of the health and social care worker Thomas Horn 21/02/2015 at 20:35 1 Explain how a working relationship is different from a personal relationship (HSC 025 01-1) a working relationship is different from a personal one because of boundries‚ professional codes of conduct there are employer policies and procedures allthough in your working relationship you would be friendly and treat everyone with equality you would also
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