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liquor was evaporated to yield a residue which was then washed with dilute sodium hydroxide and recrystallized from 95% ethanol to give 0.17 g. (25%) of the pyrimidone derivative 13b: m.p. 258-259°; X™r6.06 µ;C!Hi0H 265mM(e52,500), 289 (17,100), 300 (16,400), 322 (12,860); n.m.r. r 6.01 (1 proton) and 8.87 (9 protons).

THE RUBBER INDUSTRY ESSENTIALLY STARTED IN 1839 when Charles Goodyear discovered vulcanization (the curing process). Since this date, a large industry has grown that manufactures thousands of rubber products such as tires, hoses, belts, seals, gaskets, bearings, bushings, mounts, etc. In fact, rubber is essential for a modern industrialized economy [1].

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