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Bifunctional rare-earth exchanged Y zeolite, has the high catalytic activity for the synthesis of adamantane from tetrahydrodicyclopentadiene in the presence of hydrogen and hydrogen chloride, in a fixed bed flow system. The catalyst deactivated by pore plugging with deposited hydrocarbons can be almost completely regenerated by hydrocracking.

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The saturated acid 18 was esterified in methanol by the same procedure used for the preparation of the ester 17. The product 19 was obtained in 89% yield as a colorless oil: bp 126-127°; ir (neat) 1750 cm"1 (C=0); nmr (CDC13) 3.68 (s, 3, OCH3).