The author of 《Fluorine-19 NMR spectra of substituted pentafluorobenzenes》 were Pushkina, L. N.; Stepanov, A. P.; Zhukov, V. S.; Naumov, A. D.. And the article was published in Zhurnal Organicheskoi Khimii in 1972. Reference of Ethyl 2,3,4,5,6-pentafluorobenzoate The author mentioned the following in the article:
The value and sign of the meta spin-spin interaction constants in the 19F NMR spectra of 65 C6F5R correlated with the chem. shifts of the resp. F atoms. The experimental part of the paper was very detailed, including the reaction process of Ethyl 2,3,4,5,6-pentafluorobenzoate(cas: 4522-93-4Reference of Ethyl 2,3,4,5,6-pentafluorobenzoate)
Ethyl 2,3,4,5,6-pentafluorobenzoate(cas: 4522-93-4) belongs to esters. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. Reference of Ethyl 2,3,4,5,6-pentafluorobenzoate
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics