Abstract
1. The pure ipomeamarone was prepared from its semicarbazone which was obtained from the main fraction of the essential oil of black-rotten sweet potatoes. This material showed the following physical constants: d1041.0260, n1041.4831, [α]10D+21.6.
2. In the molecule of ipomeamarone (C15H22O3), the presence of two double bonds between carbons were ascertained.
3. One of three atoms of oxygen was in the form of carbonyl radical and the other two were in the form of methylenedioxy radical.
4. According to the molecular formula, the number of double bonds, and the forms of oxygen combination, it was concluded that the molecule of ipomeamarone should contain two rings other than benzene ring and one of these rings should imply the form of methylenedioxy radical.
