synthesized and studied for their olfactoryproperties. All of the silanes studied exhibit at least one of the main patchouli odor descriptors ‘woody,’ ‘earthy,’ and ‘camphoraceous,’ and some even exhibit all of them. The silanes MeR2SiC(OH)Me2 (12) and R3SiC(OH)Me2 (14) (R=cyclopropyl) were found to resemble natural patchouli oil most closely, with an even lower odor threshold than the natural lead
Cyclopropylethylenes have been prepared by Wittig reactions, by coupling of dicyclopropylcarbene, and by dehydration of a suitably substituted ethanol. The scope and limitations of these preparations are discussed, particularly with regard to the synthetic application of the Wittig reaction to tetrasubstituted ethylenes.
The Reaction of <i>N</i>-Methyl-1,2,4-triazoline-3,5-dione with Tetracyclopropylethylene. Formation of an Unusual Meso-ionic Product and Its Rearrangement to the Diazetidine
作者:Duk Kyung Kim、Kevin E. O'Shea
DOI:10.1021/ja038359l
日期:2004.1.28
5-dione and tetracyclopropylethylene results in the quantitative formation of a meso-ionic compound. The formation of this unusual compound is likely the result of the unique conformational and steric properties of the cyclopropyl groups which inhibit the expected reaction pathways. The meso-ionic compound undergoes an unprecedented rearrangement to the diazetidine upon warming to 55 degrees C.
The u.v. spectra of 1,1-dicyclopropyl-, cis- and trans-1,2-dicyclopropyl-, and tricyclopropylethylene, prepared by Wittig reactions, and tetracyclopropylethylene, isolated from decomposition products of dicyclopropyl ketone toluene-p-sulphonhydrazone sodium salt in dry diglyme have been studied.