Diastereoselective Hydroformylation of 2-Substituted Allylic o-DPPB-Esters—On the Origin of 1,2-Asymmetric Induction
作者:Bernhard Breit、Golo Heckmann、Stephan K. Zahn
DOI:10.1002/chem.200390044
日期:2003.1.20
addition, a crystal structure analysis of the hydroformylation product 2 d provided further confirmation of the relative configuration. Replacement of the ester carbonyl group of the o-DPPB by a methylene unit resulted in significantly worse diastereoselectivity in the course of the hydroformylation (34-->35), which indicates a decisive role for the ester carbonyl function. All the experimental observations
Fragranced cosmetic compositions having improved stability comprising a cosmetic active, especially an astringent antiperspirant salt dispersed in a water-immiscible carrier liquid that is gelled by a fragrance-sensitive fibre-forming gellant are obtained by selecting fragrances having a standard peak temperature depression (ΔT
BS
) of not more than
2
K, measured by differential calorimetry, ΔT
BS
being the difference attributable to the addition of the fragrance (blend) to a standard test composition. Especially suitable cosmetic compositions comprise an aqueous emulsion of an aluminium or aluminium/zirconium halohydrate salt optionally further complexed, dispersed in a water-immiscible carrier that is gelled by cellobiose octanonanoate.
通过选择具有标准峰值温度衰减(ΔT
BS
)不超过
2
K 的香料,ΔT
BS
是在标准测试组合物中加入香料(混合物)后产生的差值。特别适合的化妆品组合物包括铝或铝/锆卤水盐的水性乳液(可选择进一步络合),该乳液分散在不溶于水的载体中,并由辛壬酸纤维素凝胶化。
Resin for use in magnetic recording media and method of producing the same