可以生成高立体异构纯度的三取代烯烃的催化交叉复分解(CM)反应很重要,但范围仍然有限。这里引入了 CM 反应,生成Z-三取代的 α-甲基、α,β-不饱和烷基酯和芳基酯、硫羟酸酯和酰基氟。 Mo双芳基氧化物、单芳基氧化物吡咯化物或单芳基氧化物氯化物复合物促进转化;也可以使用含有Mo络合物的空气稳定且市售的石蜡片。烷基、芳基和甲硅烷基羧酸酯以及硫羟酸酯和酰基氟试剂可以购买或可以一步制备。产物收率 55–95%, Z / E比为 88:12–>98:2(通常>95:5)。该方法的适用性通过香茅醇两步转化为异薄荷内酯前体(1.7 g,产率 73%, Z / E 97:3)和乙酸羊毛甾醇单步转化为 3- epi -anwuweizic 来突出。酸(产率 72%, Z / E 94:6)。其中包括 DFT 研究的结果,涉及几个最初令人费解的催化剂活性趋势,提供以下信息:(1) 关键是,由竞争性同复分解
In the presence of a catalytic amount of Lewis acid, various carboxylic esters or S-phenyl carbothioates are prepared in excellent yields by the respective reactions of equimolar amounts of silyl carboxylates and alkyl silyl ethers or phenyl silyl sulfides with 4-trifluoromethylbenzoic anhydride.
A combination of a musk with one or more ingredients of specific chemical structures in particular proportions makes it possible to obtain a fragrance composition which can mask an odor peculiar to an acidic hair cosmetic composition and is also excellent in long-term stability. By combining fragrant materials selected as desired from (E) ingredients each characterized primarily by the abundant release of a scent from foam, (F) ingredients each characterized primarily by the abundant release of a scent from a bottle mouth and (G) ingredients each characterized by good persistence of scent, an excellent fragrance composition can be obtained with a good balance among the abundant release of a scent from foam, the abundant release of a scent from a bottle mouth, and good persistence of scent.
Alkaline agent for lightening hair containing oxidants and special carboxylic acid esters
申请人:Henkel AG & Co. KGaA
公开号:US10251826B2
公开(公告)日:2019-04-09
The subject matter of the present disclosure includes agents for lightening keratin fibers, more particularly human hair, containing in a cosmetic carrier:
(a) at least one carboxylic acid ester of the formula (I)
(b) at least one peroxide compound, and
(c) water,
wherein the agent has a pH value in the range of from about 7.5 to about 12.5.
A further subject matter of the present disclosure includes a kit-of-parts in which the aforementioned components exist packed separately in two agents (A) and (B).
ALKALINE AGENT FOR LIGHTENING HAIR CONTAINING OXIDANTS AND SPECIAL CARBOXYLIC ACID ESTERS
申请人:Henkel AG & Co. KGaA
公开号:US20180140523A1
公开(公告)日:2018-05-24
The subject matter of the present disclosure includes agents for lightening keratin fibers, more particularly human hair, containing in a cosmetic carrier:
(a) at least one carboxylic acid ester of the formula (I)
(b) at least one peroxide compound, and
(c) water,
wherein the agent has a pH value in the range of from about 7.5 to about 12.5.
A further subject matter of the present disclosure includes a kit-of-parts in which the aforementioned components exist packed separately in two agents (A) and (B).