Dropdown 1: Donating/ Withdrawing Dropdown 2: Stabilize/ Destablizing Dropdown 3

Question

Dropdown 1: Donating/ Withdrawing

Dropdown 2: Stabilize/ Destablizing

Dropdown 3: Activating/ Deactivating

Dropdown 4: Donating/ Withdrawing

AROMATIC COMPOUNDS: FRIEDEL CRAFTS REACTIONS IN THE SYNTHESIS OF DYES Reactivity of the aromatic ring in Friedel-Crafts reactions can be influenced by ring substituents 6. In the preparation of rhodamine B, the hydroxyl and amino groups on the phenyl ring of the reactant are electron [Dropdown 1Ugroups, thus they [Dropdown 2Uthe carbocation (sigma complex) intermediate and are considered [Dropdown groups. In the synthesis of thymolphthalein, the alkyl groups on thymol are electron [Dropdown 4 groups. Dropdown 1 donating Dropdown 2: stabilize Dropdown 3 activating Dropdown 4 donating

Explanation / Answer

In the preparation of Rhodamin B, the hydroxyl and aminogroups on the phenyl ring of the reactant are electron donating groups, thus they stabiize the carbocation (sigma complex) intermediate and are considered activating groups. In the synthesis of thymolphthalin, the alkyl groups on thymol are electron donating groups.

i.e Dropdown 1: Donating

Dropdown 2: Stabilize

Dropdown 3: Activating

Dropdown 4: Donating

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