数種のモノ-及びセスキテルペン炭化水素の熱異性化

テルペン類の溶融塩を用いる反応.I.

抄録

The thermal isomerizations of 2-pinene [1], 2 (10) -pinene [2], cis-pinane [3], 3-carene [4], and longifolene [5] in a mixed fused salt which were carried out under reduced pressure were investigated.
1, 8-p-Menthadiene [8] and (4E, 6Z/4E, 6E) -allocimene [IA], [11B] were obtained as three main products from [1]. The best yield of the isomerization products was 45 %, [11A plus 11B].
[8] and myrcene [12] were obtained from [2]. Especially, [12] was obtained at the highest yield (70%) among the isomerization products.
2, 4 (8) -p-Menthadiene [10], dihydromyrcene [13] and 8, 9-p-menthene [14] were obtained from [3], and [13] was obtained at the highest yield (66%).
1, 3 -Caradiene [15], p-cymene [16], 1-methyl-4-isopropenyl benzene [17] and 1-methyl-3-isopropenyl benzene [18] were obtained as four main products from [4].
Isolongifolene [19] was obtained as a main product, however, three unidentified compounds were also obtained as by-products from [5].
From these results, it is concluded that the isomerization of terpenes in an inorganic fused salt is useful in the insolubility of the reaction products and the heat-stability of the inorganic fuzed salt.