Wittig reaction

Objective The objective of this lab is to synthesize and prepare the E isomer of Stilbene through the Wittig reaction of benzyltriphenylphosphonium chloride, benzaldehyde, and sodium hydroxide. Procedure Part A- Preparation of (E)-Stilbene • In a 150 mL separatory funnel, 3.9 g (10 mmol) of benzyltriphenylphosponium chloride and 1.5 mL (15 mmol) of benzaldehyde were poured into 7.5 mL of dichloromethane (DCM), which was then treated with 35 mL of 50% sodium hydroxide. The separatory funnel was

study includes a Vertec vertical jump measuring system (Figure 1) and a Bertec force plate (Figure 2). The Vertec vertical jump measuring system measures individuals vertical jump capabilities in inches. The Bertec force plate measures the ground reaction forces in newtons produced when an individual performs a jump and when they land following a jump. The Vertec vertical jump measuring system is constructed out of a steel frame and has horizontal vanes that rotate when the hand touches them. The

kicking action (Lees & Nolan, 1998) The biomechanical principles that influence a soccer player’s ability to achieve a maximal velocity instep kick include. – Angular Velocity of the lower limbs – Coefficient of restitution – Ground reaction force Angular Velocity of the lower limbs The angular velocity begins at the support foot plant phase and continues into the follow-through phase. For a player to achieve a maximal velocity instep kick, this is one of the main biomechanical principles

Factors Affecting Reaction Rate Bob Jones Josh October 2, 2014 Period 3 Introduction: In reference to the collision theory, molecules act as small spheres that collide and bounce off each other, transferring energy among themselves when the collide. In order for a reaction to occur, there must be collisions between molecules. Through experimentation, factors are discovered that influence the reaction rates of chemical reactions include the concentration

Henri Louis Le Chatelier (i) Henri Louis Le Chatelier was a world renowned chemist known primarily for his work in developing “Le Chatelier’s Principle”. Henri was born to an academic bourgeoisie family on October 8th, 1850, in Paris France (1). Le Chatelier was fortunate as his father, Louis Le Chatelier, was able to teach him the basics of math and science, thus giving him a head start, and due to his parent’s status and wealth he was able to study at several universities (2). Le Chatelier’s earned

being done it was about to show the mole ratio. The mole ratio the ratio of moles of what you've been given in a reaction to what you want to find. INTRODUCTION: A mole ratio is the ratio of moles of what you've been given in a reaction to what you want to find. for any scientific experiment involving moles a chemical equation would be needed. A chemical equation is a chemical reaction using symbols to represent specific elements from the periodic table. the coefficients are the numbers represent

CHAPTER 2: BACKGROUND Deposition and characterization of the thin films discussed in Chapter 1 will require an understanding of many different tools and processes that are currently used in the semiconductor industry today. This chapter will cover the principles behind the growth process, the experimentation and the material properties. The equipment used for these processes will be discussed in depth as well. 2.1 Equipment The equipment used in the deposition of thin films can vary widely depending

The History of Chemistry is ancient, starting at 1000 B.C to present time. Chemistry has evolved drastically over the centuries. the first civilization to take over chemistry were the Egyptians and Babylonians founded practical knowledge concerning the arts of metallurgy, pottery and dyes, but didn't develop a systematic theory. In this period of time tons of civilizations tried to figure out the life of chemistry and how it worked. A basic chemical hypothesis first emerged in Classical Greece

the Rate of Reaction Aim-We is going to investigate how temperature effects the rate of reaction when we use a Magnesium Ribbon and dissolve it in Hydrochloric Acid. Different Variables-There are four different variables that effect the rate of reaction, surface area, concentration, temperature and catalysts. Here is some information on each variable with diagrams. How does surface area effect rate of reaction? In a substance the rate of reaction will be quicker

temperate Conical flask – to hold acid 1 litre breaker – contain water Measuring cylinders x2 50ml 25ml Blanco – to weight out the marble chips Marble chips CaCO3 – which react with Hydrochloric acid Stopwatch – to time when the reaction starts Delivery tube – to pass the air Camp stand – to hold the equipment Boson – it heats up the water Tripod – to hold the beaker at a certain height that has the most heat Ice – to cool down the water of a certain temperate