摘要:
A method for preparing a-(4-isobutylphenyl)propionic acid or its precursor is here disclosed which comprises the following steps (I), (II) and (III):
step (I): subjecting isobutylbenzene and a polyalkylbenzene to disproportionation reaction in order to form p-isobutylethylbenzene step (II): dehydrogenating p-isobutylethylbenzene obtained in the step (I) to form p-isobutylstyrene, and step (III): the following step (IIIa) or (IIIb):
step (IIIa): reacting p-isobutylstyrene obtained in the step (II) with carbon monoxide and hydrogen to prepare a-(4-isobutylphenyl)propionaldehyde, or step (IIIb): reacting p-isobutylstyrene obtained in the preceding step (II) with carbon monoxide and water or a lower alcohol to prepare a-(4-isobutylphenyl)propionic acid or its alkyl ester.
摘要:
A method for preparing a-(4-isobutylphenyl)propionic acid or its precursor is here disclosed which comprises the following steps (I), (II) and (III): step (I): subjecting isobutylbenzene and a polyalkylbenzene to disproportionation reaction in order to form p-isobutylethylbenzene step (II): dehydrogenating p-isobutylethylbenzene obtained in the step (I) to form p-isobutylstyrene, and step (III): the following step (IIIa) or (IIIb): step (IIIa): reacting p-isobutylstyrene obtained in the step (II) with carbon monoxide and hydrogen to prepare a-(4-isobutylphenyl)propionaldehyde, or step (IIIb): reacting p-isobutylstyrene obtained in the preceding step (II) with carbon monoxide and water or a lower alcohol to prepare a-(4-isobutylphenyl)propionic acid or its alkyl ester.
摘要:
A method for preparing α-(4-isobutylphenyl)propionic acid or its precursor is here disclosed which comprises a step A of forming p-isobutylstyrene from p-isobutylethylbenzene and a step B of forming α-(4-isobutylphenyl)propionaldehyde from p-isobutylstyrene or a step C of forming α-(4-isobutylphenyl)propionic acid or its alkyl ester from p-isobutylstyrene. Furthermore, a method for preparing said p-isobutylethylbenzene is also disclosed which comprises alkylating isobutylbenzene or 4-ethyltoluene with ethylene or propylene.