two kinds of selectivity are evident in Diels-Alder reaction products. The stereochemistry of the dienophile is retained in the product. If the substituents of the dienophile are cis‚ they remain cis in the product. If they are trans‚ they remain trans in the product. If the diene is cyclic‚ and if the dienophile has cis substituents‚ then two stereochemical outcomes are possible. The endo isomer is more sterically hindered than the exo. In spite of this‚ the endo tends to predominate in cases where
Premium Alkene Covalent bond Chemical bond
I. CURRENT SITUATION A. CURRENT PERFORMANCE Wal-Mart is the world’s number 1 retailer‚ with more than 4‚800 stores‚ including 1‚475 discount stores‚ 1‚750 combination discount and grocery stores (Wal-Mart Supercenters in the US and ASDA in the UK) and 540 warehouse stores (SAM’s Club). Nearly 75% of its stores are in the US‚ but Wal-Mart is expanding internationally. Wal-Mart is the number 1 retail in Canada and Mexico. The company also owns nearly 38% of Japanese supermarket chain SEIYU. Wal-Mart
Premium Wal-Mart
investments‚ CI and a network of partners demonstrate that preserving natural ecosystems and biodiversity is vital to successful sustainable development. They do this by showing how environmental policy and governance‚ innovative market and incentive mechanisms for protecting biodiversity and engaged civil society groups are essential for sustainable social and economic development. Today‚ the world has caught up with CI. Governments‚ businesses‚ and individuals on every continent recognize that CI must
Premium Biodiversity
Z-2-hexene and E-2-hexene. (4 points) 7. Draw 1-butene. Why does it not make sense to specify either Z or E 1-butene while you must specify Z or E 2-butene to draw the correct molecule? (3 points) 8. Label each double bond E (trans)‚ Z (cis)‚ or neither. (It may help to draw in critical H’s.) (4 points) 9. Label each double bond Z‚ E‚ or neither. (11 points) a. For each structure draw one constitutional isomer and all possible configurational stereoisomers. b. A “terminal”
Premium Chemical bond Atom
Exam Russian Foreign Policy 25/I/2010 PART I : Write an essay Discuss the elements of continuity and change in the foreign policy of post-Communist Russia‚ comparing it with the policies of the Soviet Union and the Russian Empire. Globally seen‚ the goals of the current Russian foreign policy are completely different than the goals the Russian empire or the Soviet Union were wanting to achieve. Nowadays‚ the main interest of Russia is nothing but Russia itself and this is completely different
Premium Russia Soviet Union Ukraine
A mineral is any naturally occurring‚ inorganic substance‚ often additionally characterized by an exact crystal structure. Its chemical structure can be exact‚ or can vary within limits. Minerals possess a number of properties that are used as an aid in their identification just like color‚ luster‚ streak‚ cleavage‚ hardness‚ specific gravity‚ and even by their chemical properties‚ composition‚ Hardness‚ Crystal Form‚ Electrical Properties and Melting Points. Here I got a mineral as shown in the
Premium Chemistry Crystal Fundamental physics concepts
James ci racconta delle varie illuminazioni. La prima riguarda le presunte "coincidenze" che accadono nella vita di tutti i giorni‚ facendo notare che esiste una nuova realtà e nascosta rispetto al mondo fisico. La seconda illuminazione invece si focalizza
Premium Vida Estado Estados Unidos
References: 1. Weldegirma‚ Solomon. "Diels-Alder Reaction: Synthesis of cis-Norbornene-5‚6-endo- dicarboxylic anhydride." Experimental Organic Chemistry. Print. 2. Myers‚ Kyle‚. Roark‚ James. Diels-Alder Synthesis of Exo-Norbornene-cis-5‚6- Dicarboxylic Anhydride for Organic Chemistry Laboratory Instruction. Web. <http://www.unk.edu/uploadedFiles/academics/gradstudies/ssrp/Myers.pdf>. 3. Jacobsen
Premium Chemistry Distillation
Project Appendix IV: Research Report for CIS: The Role of ICTs in Knowledge Sharing within Rural Communities in Ghana 2 1. Introduction Structure of the report. The internship is a compulsory part of the Master International Relations / International Organizations (IRIO) at the Faculty of Arts of the University of Groningen‚ the Netherlands. In thisreport I will give an overview of my internship for the Centre for International Cooperation (CIS) at VU University Amsterdam‚ the Netherlands
Premium Ghana
4-tert-butylcyclohexanone and using IR analysis to confirm that our oxidation was successful. In the second week of this lab we will use sodium borohydride to reduce (Mechanism: Figure 7) the 4-tert-butylcyclohexanone created the previous week into the cis-4-tert-butylcyclohexanol isomer (Figure 4)‚ the trans-4-tert-butylcyclohexanol isomer (Figure 5)‚ or a racemic mixture of Tarnas 2 the two. We will then compare the isomeric composition of the product we yielded in week 2 to commercial 4-tert-butylcyclohexanol
Premium Chlorine Alcohol