5.29(a)Carbon atoms that are involved in double bonds are sp2-hybridized, with ideal bond angles of120°. Incorporating an sp2-hybridized carbon into a three-membered ring leads to more anglestrain than incorporation of an sp3-hybridized carbon. 1-Methylcyclopropene has two sp2-hybridized carbons in a three-membered ring and so has substantially more angle strain thanmethylenecyclopropane.The higher degree of substitution at the double bond in 1-methylcyclopropene is not suffcientto offset the increased angle strain, and so 1-methylcyclopropene is less stable than methyl-enecyclopropane.(b)3-Methylcyclopropene has a disubstituted double bond and two sp2-hybridized carbons in itsthree-membered ring. It is the least stable of the isomers.5.30In all parts of this exercise, write the structure of the alkyl halide in suffcient detail to identify thecarbon that bears the halogen and the b-carbon atoms that bear at least one hydrogen. These are thecarbons that become doubly bonded in the alkene product.
This is the end of the preview. Sign up
access the rest of the document.