More research is needed about Phthalazine

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NMR Spectra of Dimethyl 1-Acetyl-1,2-dihydro-2-quinolyl-phosphonate and Related Compounds

1H, 13C, and 31P NMR spectra of the products from the Reissert type reactions using acyl halides and trimethyl phosphite were measured and correlated with their structures. 31P Chemical shift of dimethoxyphosphinyl group and 13C chemical shift of the alpha-carbon atom, as well as 1JCP and 2JPH can be criteria to differentiate the 1,2- and the 1,4-adducts from each other.Thus, there NMR parameters can be a clue to elucidate the regioselectivity of the reactions.

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Reference£º
Phthalazine – Wikipedia,
Phthalazine | C8H6N422 – PubChem