Dyera tree

Common names dyera tree or jelutong. The latex is used in the manufacture of chewing gum. 

Two monomethyl ethers of m /o-inositol are known bornesitol 37), m.p. 199°, from Borneo rubber and opepe Sacrocephalus diderrichii) wood (S7a), and sequoyitol 11, 38), m.p. 234-235°, from California redwood. Sequoyitol, a meso compound, is 5-0-methyl-w2/o-inositol 39). Bornesitol is optically active. A dimethyl ether, dambonitol, m.p. 195°, is found in the latex of Gabon 40) and other rubbers and in the latex of the Dyera tree 41)- It has been shown to be 1,3-di-0-methyl-m2/o-inositol 41a)-... 

An alternative chewing gum base is obtained from jelutong, a mixture of polyisoprene and resin obtained from latex of the Dyera costulata. This tree is found in many countries but Borneo is the principal commercial source. At one time jelutong was an important rubber substitute and 40000 tons were produeed in 1910. Production in recent years has been of the order of 5000 tons per annum, mainly for chewing gum. 

This is the other natural rubber used in making chewing gum. It is produced from the sap of Dyera costulata of the genus apocyanesas. This tree grows in the Far East. The crude product is processed by a system involving the injection of steam into the raw material. 

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