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Lac Processing & Product Development Division, Indian Lac Research Institute, Namkum, Ranchi-834 010, Jharkhand, India E-mail : lppd@ilri.ernet.in Fax : 91-0651-2260202 Manuscript received 17 February 2006, revised 13 July 2006, accepted 25 August 2006 (E)-7-Hexadecen-1,16-olide (ambrettolide), having musk-like odour being used as a fixative in perfumery industry. It was synthesized from \(threo\)-aleuritic acid (9,10,16-trihydroxyhexadecanoic acid) by simple procedure.

Chemistry Division, Indian Lao Research Institute, Namknm, Ranchi-854 010, Manuscript received 20 November 1981, accepted 8 July 1982 Lac resin has been found to contain 10.70% free fatty and 2.7% free aldehydic terpenic acids. The free fatty acids are composed of (i) saturated and unsaturated straight, chain lengths of C14,C15and C18, (ii) 6-ketotetradecanoic, (iii) 6-hydroxy­tetradecanoic (butolic), (iv) 16-hydroxyhexadecanoic, (v) 16-hydroxyhexadec-eis-9- enoic, (vi) \(threo\)-9,10-dihydroxy of C14 and C16 chain lengths and (vii) \(threo\)-9,10,16- trihydroxy hexadecanoic (aleuritic) acids, while the terpenic acids constitute a mixture of jalaric, \(laccijalaric\) and a new aldehydic acid (C15H18O3).