Chemistry of lac resin-VII: Pure lac resin-3: structure

Singh, A. N. ; Upadhye, A. B. ; Mhaskar, V. V. ; Sukh Dev, ; Pol, A. V. ; Naik, V. G. (1974) Chemistry of lac resin-VII: Pure lac resin-3: structure Tetrahedron, 30 (20). pp. 3689-3693. ISSN 0040-4020

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It has been found that gas-liquid-chromatography of methyl esters of lac acids can be carried our after formylation of free OH groups. By this method, it has been found that pure lac resin is based on terpenic acids (essentially jalaric acid) and aleuritic acid in a 1:1 ratio and not in a 2:1 ratio as suspected earlier. This conclusion is clearly supported by a comparision of 220 MHz PMR spectra of pure lac resin derivatives with suitable reference samples. The PMR spectral data, taken along with the earlier results lead to the most plausible structure 11 for 'pure lac resin'.

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