Occurs in leaves of odoriferous plants (including shrubs and trees). Isoln from Japanese oil of peppermint: Walbaum J. Prakt. Chem. [2] 96, 245 (1917); Walbaum, Rosenthal, Ber. Schimmel 1929 Jubilums-Ausg., p 205; from raspberry juice: Bohnsack, Ber. 75, 72 (1942). The natural product has the cis configuration: Crombie, Harper, J. Chem. Soc. 1950, 873; Harper, Smith, ibid. 1955, 1512.