Provided is a fragrance composition containing a compound that is highly harmonious with other various fragrances and that can impart a stronger floral feeling by being blended. A fragrance composition containing 3,6-dimethyl-heptane-2-ol. The fragrance composition may further contain at least one selected from the group consisting of, for example, 7-methyloctane-3-ol, esters, carbonates, aldehydes, ethers, lactones, and alcohols other than 3,6-dimethylheptane-2-ol.
The aldolcondensations of various aldehydes with ketones in the presence of anionic (basic) ion‐exchange resins have been investigated. Both batch and continuous modes were studied and compared for the reaction of citral (a mixture of geranial and neral) with acetone to give ψ‐ionone. Different reaction conditions were investigated, and the performances of five different ion‐exchange resins were compared
Sequential Aldol Condensation-Transition Metal-Catalyzed Addition Reactions of Aldehydes, Methyl Ketones, and Arylboronic Acids
作者:Yuan-Xi Liao、Chun-Hui Xing、Matthew Israel、Qiao-Sheng Hu
DOI:10.1021/ol200457q
日期:2011.4.15
Sequential aldol condensation of aldehydes with methyl ketones followed by transition metal-catalyzed addition reactions of arylboronic acids to form β-substituted ketones is described. By using the 1,1′-spirobiindane-7,7′-diol (SPINOL)-based phosphite, an asymmetric version of this type of sequential reaction, with up to 92% ee, was also realized. Our study provided an efficient method to access β-substituted
Catalytic Asymmetric Michael Reactions of α,β‐Unsaturated Ketones with Sulfonyl‐Containing Nucleophiles: Chiral Synthesis of (
<i>R</i>
)‐Muscone and (
<i>S</i>
)‐Celery Ketone
作者:Xiaomin Sun、Feng Yu、Tingting Ye、Xinmiao Liang、Jinxing Ye
DOI:10.1002/chem.201002418
日期:2011.1.10
An amine worth its salt: A highly enantioselectiveMichaeladdition reaction of α,β‐unsaturated ketones with the sulfonyl‐containing nucleophiles bis(phenylsulfonyl)methane and 1‐(phenylsulfonyl)propan‐2‐one, catalyzed by a chiral primary amine salt, has been developed and gives excellent enantioselectivities (see scheme). The methodology has successfully demonstrated its synthetic utility in the chiral
Diastereodivergent Catalytic Asymmetric Michael Addition of 2-Oxindoles to α,β-Unsaturated Ketones by Chiral Diamine Catalysts
作者:Yuan Wei、Shigang Wen、Zunwu Liu、Xinxin Wu、Bubing Zeng、Jinxing Ye
DOI:10.1021/acs.orglett.5b01149
日期:2015.6.5
catalytic asymmetric Michael addition of 2-oxindoles to α,β-unsaturated ketones has been successfully developed with two complementary chiral diamine catalysts, affording chiral 3,3-disubstituted oxindoles with two adjacent chiral centers. Diastereodivergence has been realized through modifying substrates and utilizing different catalysts. Either anti-or syn-configured products possessing vicinal quaternary