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公开(公告)号：US11518727B2
公开(公告)日：2022-12-06
申请号：US17432672
申请日：2019-04-13
Applicant: ANTHEA AROMATICS PRIVATE LIMITED
Abstract: The present disclosure provides a process for preparing an aryl ketone of Formula I, comprising reacting a substituted benzene of Formula II with a carboxylic acid of formula IIIa and/or a carboxylic anhydride of formula IIIb in presence of an alkyl sulfonic acid acting as catalyst cum solvent/contacting medium. I, II, IIIa, IIIb, wherein, R1, R2, R3 and R4 are as defined in the description.
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公开(公告)号：US11319297B2
公开(公告)日：2022-05-03
申请号：US17419930
申请日：2019-07-27
Applicant: ANTHEA AROMATICS PRIVATE LIMITED
IPC: C07D317/54 , C07C41/14 , C07D317/52 , C07C45/51
Abstract: Disclosed herein is an efficient, environment friendly and commercially viable process for preparation of chloromethylated compound of formula I in substantially pure form and high yield, from the compound of formula II. The process includes contacting the compound of formula II with a chloromethylating agent generated in-situ by reaction of a formaldehyde precursor and hydrogen chloride, in a suitable solvent/contacting medium and in the presence of a catalytic amount of a short chain/low molecular weight carboxylic acid of formula III. I II III wherein, R1, R2, R3 and R4 are as defined in the description.
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公开(公告)号：US10093622B2
公开(公告)日：2018-10-09
申请号：US15562518
申请日：2015-06-04
Applicant: ANTHEA AROMATICS PRIVATE LIMITED
IPC: C07D201/04 , C07D201/06 , C01B21/14 , C01G9/02 , C07D201/16 , C07D227/087 , B01D3/36
Abstract: Disclosed herein is an efficient, economical, industrially advantageous, straight-through process for the preparation of cyclic amides, also referred as lactams, in substantially pure form and high yield, from the corresponding cyclic ketones and a hydroxylammonium salt, using a combination of amphoteric metal oxide or amphoteric masked metal oxide and a base.
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