Scope………………………………………………………………………………………3 Chemistry Lab Report Write the symbols and equation used to make a dilute solution from concentrated or stock solution. In this reaction, NaOH attacked the Wittig reagent to generate a ylid which is a carbon nucleophile. Product This illustrates the huge diversity of olefin products; and as such the need to be stereoselective in how one can synthesise said functionality within a molecule. 1mL vmax / cm-1: 3030 and 2950 sharp (=C-H and C-H aromatic), 1590 weak (C=C), 1570 weak (C-C aromatic). 50% Aqueous NaOH The foundation of the Wittig reaction is not complex. Georg Wittig was a German chemist and Nobel Prize winner in 1979 for the Wittig reaction (1). This effervesces was used as an indicator to whether the reaction had gone to completion on forming the in situ base: sodium ethoxide. Formula weight The Wittig is basically used to convert a carbonyl group, C=O, into an alkenes, C=C. The rate of these reactions is controlled by biological catalysts of which are the enzymes. /Height 1024

A melting point was obtained and fell in the range of 126-128 as compared to the literature value of 130-132 (2). Mole Ratio 0.145 g Is more than one product obtained in any of the three reactions? There are many ways in which chemists can measure reaction ... ... the calculated gave the percent yield. ...Lab report April 14, 2013 }55U�`2�4R��O���ۮ�+����-R;���Ga���jJ�P�u:nc?-���Zs��WkG6����S��y���hki��$�۪��aH��$������kA� �C�A�YT`N��G��� 102p. The carbon of the carbonyl ... ... crystal after recrystallization: 0.549 g % recovery = 94.3 % Melting point = 262˚C – 266˚C Conclusion The reaction ... to make a cyclic compound. Benzyltriphenylphosphonium chloride ����-�O�4>�/9���hS1z��rf����=A@����T��#��E{+K���1 ���Lj]߻ǚ��B������%���!�{x�o=�Lp0f�ԏPyov���̭4}e)|O�A�����>$�w��L�_^ȰʨKޤu@6�Ӽ��bB���B�X���h. Conclusion………………………………………………………………………………………...7 How to make a phosphorus ylid (1).

The atoms are pulled closely ... and blue litmus paperProcedurePart A- Reactions of Alkali Metals with WaterBeaker ... ... influence thespeed of a chemical reaction and yield information about the reaction’s mechanism ... compound, so by observing the change in absorbance, the rate of reaction ... point of tangency. A melting point was obtained and fell in the range of 126-128 as compared to the literature value of 130-132 (2). Example of significant changes being: not using subscript for my reference numbering; trying to condense my writing in to a more concise format and focusing more on what the experiment was trying to achieve. The starting materials for a Wittig Reaction are a compound with a carbonyl group and a phosphorus ylide.

This experiment performs a modified Wittig reaction using a phosphorus-containing Hornes-Emmons-Wittig reagent to generate an enolate anion of trimethyl phosphonoacetate instead of a phosphorus ylide. 2. Record time for blue tint to appear The materials used in the making of this experiment are as stated: Three test tubes, 10.5mL of... ...BIO 211 Lab Section 11 This reaction goes so well due in part to the formation of the immensely strong P-O bond. Scheme 2: An alkene synthesis via a generalised Wittig reaction has been presented. S. Fordred, Ph. The melting point could have been lowered due in part to some residual solvent. Results……………………………………………………………………………………………..6 Hi there! What is a meniscus? The stir plate is then slowed down to a gentle spin. After 30 minutes of reaction time, the solution was removed and 1.5 ml of water and dichloromethane were added to the vial. The crystals were gold or silver-yellow metallic in nature. ... products.

Note the formation of a white precipitate, which is triphenylphosphine oxide. Wittig was educated originally at Tubingen; Wittig spent periods at Braunschweig, Freigurg, back to Tubingen again before taking up the post as director of the organic chemistry department at Heidelberg (1). Under Wittig-Horner parameters, we could hypothesize achieving a yield in the 65 % range. Molarity = moles of substance per liter of solution. an alkene proton (reference).20 The 3J coupling constant of 20.26 Hz is an indication of the vicinal protons being in an anti conformation with a torsion angle of 0° or 180° (the maximum), as described by the Karplus equation, see Figure 3 (reference).21 In other words, the vicinal coupling constant indicates that our product alkene is specifically the trans- diastereomer. How about getting this access immediately? The pipettors were used to obtain the appropriate amount of each chemical in order to perform the separate trials. 16. 8. A white powder of Benzyltriphenylphosphonium chloride (0.255 g, 0.656mmol) and a mustard-yellow colored 9-anthraldehyde (0.143 g, 0.694mmol) were added to an Erlenmeyer flask along with a stir bar and clamped over a stir plate. - The concentration of substance is described as molarity and this can be expressed as – Downloaded 2 March 2004. Melting point analysis showed that the olefination reaction was successful, since the experimentally observed melting point corroborates with other published values.



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