I found the field of Chemistry very interesting. Saw the article Palladium-Catalyzed 8-Aminoquinoline-Aided sp(2) delta-C-H Intramolecular Amidation/Annulation: A Route to Tricyclic Quinolones published in 2019.0. Recommanded Product: 3-Methylbenzoic acid, Reprint Addresses Babu, SA (corresponding author), Indian Inst Sci Educ & Res IISER Mohali, Dept Chem Sci, Sect 81,Manauli PO, Mohali 140306, Punjab, India.. The CAS is 99-04-7. Through research, I have a further understanding and discovery of 3-Methylbenzoic acid
Systematic investigations of a Pd(II)-catalyzed, 8-aminoquinoline directing group (DG)-aided sp(2) delta-C-H amidation (C-N bond formation) of different biaryl carboxamides are reported. Various biaryl carboxamides with suitably positioned sp(2) delta-C-H bond with respect to the DG were assembled via beta-C-H arylation and then they were subjected to Pd(II)-catalyzed sp(2) delta-C-H intramolecular amidation/annulation reactions. While the intramolecular amidation of the sp(2) delta-C-H bond of some carboxamides was not fruitful, several biaryl carboxamides underwent intramolecular amidation of their sp(2) delta-C-H bonds to afford various tricyclic quinolone motifs such as, phenanthridin-6(5H)-ones and thieno-/furo-/pyrrolo-[2,3-c]quinolin-4(5H)-ones. The assembly of the required biaryl carboxamides possessing the sp(2) delta-C-H bond via the beta-C-H arylation and the successive intramolecular amidation (C-N bond formation) of the resulting biaryl carboxamides were also performed in one-pot reaction conditions to afford tricyclic quinolones.
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Reference:
Isothiazole – Wikipedia,
,Isothiazole – ScienceDirect.com