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Describe Suprafacial and Antarafacial Rearrangement:
The term Sigmatropic rearrangement is used to describe a chemical change in which a sigma bond along with the group attached to this, flanked by one or more π-electron system, migrates in an uncatalyzed process to a new position in the molecule.
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- > acetone > ethane - Two molecular ions H3C-CH₂-CH₂-COR and have undergone McLafferty rearrangement and Ortho effect respectively. What are the possible fragments obtained as a result of these processes ? COOCH3 OH + -COH]: [CH₂O and Co] CO (A) (B) x] : [GH₂C (C) RH, C₂H₂ and CH₂CO: [(CH₂O), CO and CH₂OH] (D) H₂CCROH and C₂H4; [(CH₂O), CO and CH₂OH] R-CH₂-CH₂ - CH₂ - COH H₂C=CR = CROH and H₂C = CH₂ C₂H403 and CH4 P.T.O.As the molecular weight of alkenes increases, the boiling points also increase. Which ofthe following factors is best associated to this trend? *Dipole interactionGeometric isomerismStructural isomerismSurface areaA radical substitution reaction is primarily observed in the following reactions. Whichreaction is it? *Oxidation of but-2-eneChlorination of butaneBoiling of hex-3-eneCombustion of methaneWhich among the following compounds has the most electronegative carbon in itsstructure? *ButyneBenzeneBenzaldehydeCyclobutaneName the following compounds. Include stereochemistry where appropriate:
- Bromine reacts with alkenes in methanol according to the equation: - When this reaction was carried out with 4-tert-butylcyclohexene, only one isomer was formed with the molecular formula C12H23BrO (80% yield). Which of the following is the structure more reasonable for this compound?. Explain your reasoning through acorresponding mechanism.Alkenes can be converted to alcohols by hydroboration-oxidation. (a) Draw the structure of the alcohol or alcohols formed in the reaction sequence. Clearly indicate stereochemistry by drawing a wedged bond, a dashed bond and two O Hint in-plane bonds per each chiral carbon. Draw hydrogen atoms that are connected to wedge-and-dash bonds.(b) Characterize the product or products of the reactions. The first step of the reaction, hydroboration, involves addition of BH, to the double bond, with -BH, attached to one carbon and hydrogen Be sure to draw hydrogens on oxygen, where applicable. attached to the other. Consider both Rings the regioselectivity and the Select Draw More Erase stereochemistry of this addition. H Diborane, B,H,, is a source of borane, BH,, and can be used 1. B2H6, interchangeably. Diglyme is a solvent. diglyme 2. H2О2, НО", The product or products of the reaction are characterized as being O S. O racemic. O achiral. O R,S (and/or S,R). O R. O S,S. O R.R. O diastereomers.Name compound and include stereochemistry if needed
- Which of the following statements about cycloaddition reactions is not true? Cycloaddition reactions form a cyclic product with two new bonds. The course of the reaction is determined by the symmetry of the molecular orbitals of the products. Cycloaddition reactions are concerted. Cycloaddition reactions are stereospecific.5.) How many stereogenic centers are present in the following compound derived from citrus oils? А. 1 В. 3 С. 4 D. 5 Keywords: chiral, asymmetric carbon, stereogenic center, nonequivalent group, sp', tetrahedral, sp², sp, trigonal planar, linear Concepts: stereoisomerism, asymmetric carbons 6.yredict the NAME, STRUCTURE and STEREOCHEMISTRY of the BEST ORGANIC REACTANT or the MAJOR ORGANIC product for the following reactions:
- Reaction of Zn/Hg; HCI ( Clemmensen conditions) with CH3CH2C(O)C6H5 forms ____ as the product. (a) CH3CHCHC6H5 (b) CH3CH2COOH and C6H5COOH (c) CH3CH2CH2OH and C6H5OH (d) CH3CH2CH(OH)C6H5 (e) CH3CH2CH2C6H51. One version of canola oil is (C15H29CO2)3C3H5. (a) Write the transesterification chemical equation (similar to Eq. 12-7) for canola oil. (b) How much canola oil will be required to produce one ton of biodiesel? 2. Write the chemical reaction equations for hexene (C6H12), butanol (C4H9OH), and heptane (C7H₁6) for the Fischer-Tropsch synthesis process. If appropriate, the value of "n" must be used in a chemical equation.(d) When butane, CH3CH2CH2CH3 and bromine gas, Br2 is exposed to sunlight, monobrominated product are produced. The reaction equation is given below: uv CH;CH,CH,CH3 + Br2 A + B (i) State the type of reaction. (ii) What is the function of the sunlight in the reaction? (iii) Draw the structure of monosubstituted products, A and B. Label the major product. (iv) Draw the propagation steps in the mechanism for the formation of the major product.