Nevertheless, similar resonance and molecular orbital descriptions of conjugation may be written. A resonance description, such as the one shown here, involves charge separation, implying a relatively small degree of stabilization. Ionic addition of bromine to the double bond would be very slow in these circumstances (CCl4 is a nonpolar solvent). HBr (CH2CO)2NBr Br2 (CH2CO)2NH This mechanism is essentially the same as that for the free radical halogenation of alkanes, with NBS serving as a source of very low concentrations of bromine. This is shown by the following equations. The weak OO bond of a peroxide initiator is broken homolytically by thermal or hight energy. The resulting alkoxy radical then abstracts a hydrogen atom from HBr in a strongly exothermic reaction. CH2CH-CHCH 2 C H2-CHCH - C H2 : A molecular orbital model for 1,3-butadiene is shown below. Note that the lobes of the four p-orbital components in each pi-orbital are colored differently and carry a plus or minus sign.
1,6-hexanediol. product identification. cas no., 14. einecs no.
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