Cyclopentadiene dimerizes when it is stored for long periods of time. A dimer is an adduct (addition product) between two molecules. The cyclopentadiene dimer is a Diels-Alder adduct between two cyclopentadiene molecules. Write an equation for the dimerization of cyclopentadiene.
It is 4pi+2pi, Diels-Alder reaction, cyclopentadiene forms dicyclopentadiene and endo dimer is formed rather exo, due to the favorable secondary forces as a result of interaction of frontier orbitals of diene and dienophile components which lower the energy of the transition state.
The reaction given here:
Cyclopentadiene dimerizes when it is stored for long periods of time. A dimer is an adduct...
1. Cyclopentadiene rapidly dimerizes at room temperature to dicyclopentadiene, and must be fractionally distilled immediately before use in this reaction. Explain in terms of thermodynamics (G, S and H) why the equilibrium for the dimerization of cyclopentadiene to dicyclopentadiene lies with the product at room temperature and with the starting materials at elevated temperatures. Consider the following in your answer: Given that two -bonds in the starting material are replaced with one-bond and two -bonds in the product, what is...
diels alder reaction Draw a structure for the exo product formed by cyclopentadiene and maleic anhydride. Because the exo form is more stable than the endo form, why is the endo product formed almost exclusively in this reaction? In addition to the main product, what are two side reactions that could occur in this experiment? The infrared spectrum of the adduct is given in this experiment. Interpret the principal peaks.
Consider the following interface for an ADT for representing intervals (periods of time as opposed to instantaneous moments of time). typedef long Duration; // measured in seconds class DateTime { public: DateTime (int year, int month, int day, int hour, int minute, int second); ... // How many seconds between two times? Duration operator- (const DateTime& right) const; }; class Interval { public: // // An interval is a period of time beginning with a starting time // and running...
help (10 points) Write the letter ONLY of the term below that best matches the given definition: 10 a). Heterolytic bond breakage d). Electrophile g). Homolytic bond breakage j). Pro-R k). Substitution b). Si face e). Polar reaction c). Nucleophile f). Pro-S i). Elimination reaction j). Addition reaction m). Differential h). Radical reaction i). Re face 1). Dimer A process that involves symmetric bond breaking and bond making This occurs when both bonding electrons remain with one product fragment. A...
Suppose a firm the firm's initial costs when hiring a worker include hiring and training costs of $50. The wage rate for each period of employment is Wt=$100 (the same for all periods), and the value marginal product of a worker is also the same in every period, VMPt=VMP (a constant). Assume the interest rate is zero (the firm has no discounting factor over time). A. Write out this firm's profit maximizing employment rule for two periods. How productive must...
Step 1 Consider a time when you wanted to buy a certain product but could not find it. What was your reaction? Why? How did the lack of availability affect your perception of the company and of the product? Did it make you want it more or did it make you frustrated so that you lost interest. Speculate on the supply chain and distribution channel strategy that the company was trying to achieve. Step 2 Now consider a product that...
1. Procedure A. Lithium 2,6-dimethylphenoxide. In a 300-ml. flask, equipped with a magnetic stirrer and a reflux condenser and flushed with nitrogen, are placed 150 ml. of toluene (freshly distilled from sodium), 1.40 g. (0.202 mole) of lithium metal (Note 1) and 25.0 g. (0.205 mole) of resublimed 2,6-dimethylphenol. The mixture is heated under reflux with stirring for 36 hours; a nitrogen atmosphere is maintained for the reflux period (Note 2). The condenser is replaced by a distillation head with...
In a hurry to digest this . Tks for the help (thumb up) 2. A mass of m kilograms (kg) is mounted on top of a vertical spring. The spring is L metres long when disengaged and the end not attached to the mass is fixed to the ground. The mass moves vertically up and down, acted on by gravity, the restoring force T of the spring and the damping force R due to friction: see the diagram below The...
A mass of m kilograams (kg) is mounted on top of a vertical spring. The spring is L metres long when disengaged and the end not attached to the mass is fixced to the ground. The mass moves vertically up and down, acted on by gravity, the restoring force T of the spring and the damping force R due to friction: see the diagram below The gravitational force is mg dowswards, where g- 9.8m is acceleration due to gravity, measured...
5. What was the ratio of actual processing time for the product to total lead time? 1075 International Journal of Prodiction Resecarch Project Management 90,60 30 days forecast End Customers Hyerson Steel Weekly Schedule Dally Shipping Schedule Welding Finishing Assembly Wiring Fabrication 23 days CIT-140.5mn PIT-250 min C/T 126min days CT-128min PIT-480 min CIT 120 Ave CIT 120 CIO 15 days 3 days 3 days 3 days 1 days L. T. 25 days 480 min 2400 min IP.T. 3158.5 min...