950-33-4Relevant articles and documents
Nuclear magnetic resonance, force field, and MNDO studies on 1-methoxycycloalkenes
Taskinen, Esko
, p. 5795 - 5806 (1994)
The 1H, 13C, and 17O NMR spectra of 4- to 9-membered 1-methoxycycloalkenes have been recorded in CDCl3 solution. The 17O NMR chemical shifts reveal unexpectedly large and irregular variations with ring size. The other NMR shift data suggest that these variations are due to differences in the relative amounts of planar and nonplanar conformers about the O-C(sp2) bond. The same NMR data also suggest that whereas the MeO groups of the 5- to 9-membered ethers adopt mainly the expected planar s-cis conformation, the 4-membered ether exists predominantly in the exceptional s-trans conformation. The geometries of and charge densities in these ethers have been studied by force field (COSMIC, MM2) and MNDO calculations.
UNSATURATED LACTONE AS FRAGRANT SUBSTANCE
-
Paragraph 0149, (2017/10/27)
PROBLEM TO BE SOLVED: To provide a fragrant preparation employing a fragrant substance that releases a note of musk fragrance and, preferably, has a useful and unique fragrance nature. SOLUTION: The preparation employs a compound of chemical formula (la) and/or chemical formula (lb), or a mixture comprising a certain amount of the compound of chemical formula (la) and/or chemical formula (lb). SELECTED DRAWING: None COPYRIGHT: (C)2017,JPOandINPIT
Iron(III) tosylate in the preparation of dimethyl and diethyl acetals from ketones and β-keto enol ethers from cyclic β-diketones
Mansilla, Horacio,Afonso, Maria M.
, p. 2607 - 2618 (2008/12/22)
An efficient method for conversion of ketones to their corresponding dimethyl and diethyl acetals and of cyclic β-diketones into β-keto enol ethers using Fe(OTs)3 as a catalyst is described. Copyright Taylor & Francis Group, LLC.