| 摘要 |
<p>PCT No. PCT/AU91/00343 Sec. 371 Date Feb. 5, 1993 Sec. 102(e) Date Feb. 5, 1993 PCT Filed Aug. 5, 1991 PCT Pub. No. WO92/02136 PCT Pub. Date Feb. 20, 1992.An insect-repellent composition is disclosed which includes an insect repellent such as p-menthane-3,8-diol and a synergistic amount of an acetal of formula (Z). A method of forming a preferred composition is also disclosed in which citronellal undergoes an acid-cyclization reaction to yield an impure mixture of p-menthane-3,8-diols and acetals. The impure mixture is subjected to fractional distillation to remove a low boiling point fraction and to thereby yield a remaining fraction which constitutes the preferred composition.</p> |
