Benzoic Acid → Phthalide
Reaction equation
[C:1]([OH:9])(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH2:10]=O>>[C:1]1([C:2]2[C:7](=[CH:6][CH:5]=[CH:4][CH:3]=2)[CH2:10][O:9]1)=[O:8]Participants
3
Reactant 2
Product 1
Procedure
A benzoic acid derivative of formula 1 is reacted with formaldehyde under acidic conditions to yield a phthalide derivative of formula 2. ##STR4## The phthalide derivative is then brominated with any suitable brominating agent, e.g. N-bromosuccinimide to yield an unstable bromophthalide derivative, 3, which is readily reacted with water to a phthalaldehydic acid derivative, 4. ##STR5## The phthalaldehydic acid derivative may then be oxidized to the desired phthalic anhydride derivative, 5, in good yield using a suitable oxidizing agent such as manganese dioxide. ##STR6##
Sources & evidence
- ORD record
- ord-78d80e59b3fc4ea2af40e633a817992d
- Source dataset
- uspto-grants-1980_07
- Patent number
- US04213996
Reaction notes
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