Sodium bisulfite addition compounds of benzyl isothiocyanates: evidence for their structure as sodium benzylaminothiomethanesulfonates was written by Sankaran, L.;Rao, P. L. Narasimha. And the article was included in Indian Journal of Chemistry in 1977.Electric Literature of C8H6FNS This article mentions the following:
Na bisulfite addition compounds (I) of several 2-, 4-, 2,4- and 3,4-halogen substituted benzyl isothiocyanates were prepared by refluxing the isothiocyanates with Na2S2O5 in 60-75% aqueous ethanol. I are colorless microcrystalline powders, infusible, stable in the dry state and in aqueous solutions at neutral and acidic pH in the absence of air. I decomposed rapidly to benzyl thiocarbamates and sulfite in alk. solutions and to carbylamines by neutral KMnO4. Based on their UV and IR spectra, the structure of I is assigned as RNHCSSO3Na (R = R1C6H4CH2 or R12C6H3CH2, R1 = Br, Cl, F). In the experiment, the researchers used many compounds, for example, 4-Fluorobenzylisothiocyanate (cas: 2740-88-7Electric Literature of C8H6FNS).
4-Fluorobenzylisothiocyanate (cas: 2740-88-7) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Electric Literature of C8H6FNS
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics