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trans-1,3-Dibromocyclobutane has a measurable dipole moment. Explain how this proves that
the cyclobutane ring is not planar.
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- assign the stereochemical configuration of the selected tetrahedral carbon chiral centers (R, S or N (not a chiral center)) and the alkene (E, Z or N (not a stereocenter)) that are indicated by the arrows (note that you do not have to assign the configuration of every chiral center in the molecule). If the atom in question is not a chiral center or is not a stereocenter circle N for neither.assign the stereochemical configuration of the selected tetrahedral carbon chiral centers (R, S or N (not a chiral center)) and the alkene (E, Z or N (not a stereocenter)) that are indicated by the arrows (note that you do not have to assign the configuration of every chiral center in the molecule). If the atom in question is not a chiral center or is not a stereocenter circle N for neither.Explain the fact that the C-O stretch in ethers and esters occurs at 1000-1100 cm-1 when the C is sp hybridized, but at 1250 cm- when it is sp2 hybridized.
- Identify the stereogenic carbon in (S)- and (R)-limonene, rank the substituents around it and rationalize the assignment of their stereochemical configurations. Hint: When ranking carbons that have multiple bonds, consider the bolded carbon of C=C being connected to 2 carbons and the bolded carbon of C≡C being connected to 3 carbons.How many rings and π bonds are contained in a compound of molecularformula C8H12 that is hydrogenated to a compound of molecular formulaC8H14?Use resonance theory and the Hammond postulate to explain why 3-chloroprop-1-ene (CH2 = CHCH2Cl) is more reactive than 1-chloropropane (CH3CH2CH2Cl) in SN1 reactions.
- Pyrethrin II and pyrethrosin are two natural products isolated from plants of the chrysanthemum family. Pyrethrin II is a natural insecticide and is marketed as such. Q,)State the number of stereoisomers possible for each molecule.Is the molecular orbital diagram of 1,3-butadiene the same as cyclopenta-1,3-diene? If so how come? Doesn't the latter have 5 p orbitals or will it technically only have 4?Draw (1R,3S)-1,3-dimethylcyclohexane, in its minimum energy conformation. Then draw the Newman Projection for this structure with the correct stereochemistry and in its minimum energy state.
- There is a diene of molecular formula C5H8 that is chiral. Draw its structure.True or False: Acetylene is a naturally occurring conjugated diene True or False: The Diels-Alder reaction has the stereochemistry of the dienophile is retained in the product. True or False: When looking at kinetic vs. thermodynamic products the kinetic product predominates at low temperature. True or False: the mechanism of the Diels-Alder reaction is three π bonds break; one σ bond and two π bonds form.What is the best way to draw a molecular orbital diagram for 1,3-cyclopentadiene, identifying the Lowest unoccupied molecular orbital and the highest occupied molecular orbital?
