Castilloa elastica

Finely ground seeds of Castilloa elastica (3550 g) are percolated with sufficient light petroleum (boiling point 60°-80°C) to ensure removal of all the fat. The mart is dried with a current of air and percolated with chloroform until no further color is obtained with alkaline m-dinitrobenzene. The percolate is evaporated under reduced pressure, the residue triturated with dry ether (750 ml) and filtered. The residue (69.75 g) is washed with dry ether, dried, and some of the washed residue (20 g) is dissolved in a benzene-chloroform mixture (50 ml), comprising one part benzene to two parts chloroform by volume, and is absorbed on to a column of alumina (7x32 cm), previously deactivated with 10% acetic acid [hereinafter referred to as Column (I)] and eluted with the same solvent mixture. 

Natural rubber, chemically speaking poly(W.v-1,4-isoprene), is a natural polymer derived from Hevea brasiliensis and various other tropical plants like Castilloa elastica [147]. This natural polymer is mainly produced in Asia and the tropics in high, industrially relevant, amounts (e.g., 9.7 Mio mto in 2007). Apart from its usual use as an elastomeric material, some research was devoted onto the metathesis degradation (depolymerization) of natural rubber with ethylene in a CM fashion. It was believed that metathesis of natural rubber is impossible, until a pioneering... 

Hevea species. Ficus elastica, Landolphia species, Castilloa elastica, Hancornia speciosa, Forsteronia species, Funtumia elastica and F. africana, Manihot species, Clitandra species and various species of Euphorbia furnish most of the Rubber of commerce. 

Methyl ethers of several cyclitols occur as secondary substances in many higher plants. Attempts to use their occurrence for chemical taxonomy have been made (137). Sequoyitol (5-O-methyl-myo-inositol) is found in all families of gym-nosperms, and only in gymnosperms, although its distribution appears to be sporadic (137). It has been found in wood, bark, and cambial sap (114). D-Bornesitol (1-O-methyl-myo-inositol) is present in the latex of trees in the Apocynaceae family and in the wood of Sarcocephalus diderrichii (see 137). Dambonitol (1,3-di-O-methyl-myo-inositol) has been found in Gabon (Castilloa elastica) rubber latex (see 137). 

Achras sapota Castilloa elastica Ficus elastica Hevea brasiliensis Manihot alaziovii Parthenium argentatum Taraxacum koksaghyz... 

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