洞察安全,简单且廉价的磷酸(H 3 PO 4描述了醇用酸酐的)催化的酰化。与传统上提出的单酰化混合酸酐不同,提出了相应的原位生成的二酰化混合酸酐作为活性物质。特别地,二酰基化的混合酸酐充当有效的催化酰基转移试剂,而不是充当简单活化酸酐的布朗斯台德酸催化剂。值得注意的是,实现了高效磷酸(1-3 mol%)催化的醇与酸酐的酰化作用,并证明了23 g规模的酯的合成。另外,磷酸催化剂对于从羧酸,醇和酸酐的合成有用的酯化是有效的。此外,关于手性1的最新发展,1'-联-2-萘酚(BINOL)衍生的磷酸二酯催化剂通过酰化作用对醇的不对称动力学拆分,研究了一些磷酸二酯。结果,31 P NMR研究和动力学研究不仅大力支持了其他研究人员先前提出的酸碱协同机理,而且也大力支持了我们目前提出的混合酸酐机理。
Engineering Reactions in Crystalline Solids: Radical Pairs in Crystals of Dialkyl 1,3-Acetonedicarboxylates
作者:Zhe Yang、Miguel A. Garcia-Garibay
DOI:10.1021/ol006042+
日期:2000.6.1
dialkyl succinates in high chemical yields by combination of alpha-carbonyl radicalpairs produced by photochemical decarbonylation. It is proposed that the solid-state reaction depends on the exothermicity of two consecutive bond cleavage processes. It is also suggested that the efficiency of radical formation in the solid state is determined by the effect of substituents on bond dissociation energies
Freshening compositions and devices comprising same
申请人:The Procter & Gamble Company
公开号:US10113140B2
公开(公告)日:2018-10-30
The present invention relates to freshening compositions and devices comprising same that comprise a composition comprising malodor reduction compositions and methods of making and using such compositions. Such malodor control technologies do not unduely interfere with the scent of the perfumed or unperfumed situs that is treated with the malodor control technology.
A composition including a plurality of particles, wherein the particles include: about 30% to about 95% by weight of a carrier; about 0.1% to about 30% by weight of a perfume; and about 0.00025% to about 30% by weight of a malodor agent; wherein the malodor agent comprises one or more malodor reduction materials having a Blocker Index of less than 3 or a Blocker Index average of 3 to about 0.001; and wherein each of the particles has a mass between about 0.1 mg to about 5 g.