The present invention provides an industrially advantageous process for producing a hydrogenated polymer comprising subjecting a polymer having an olefinic carbon-carbon double bond and hydroxy group and/or a functional group which is convertible into hydroxy group or convertible into hydroxymethyl group to hydrogenation under the presence of palladium on a basic activated carbon and/or platinum on a basic activated carbon. The process of the present invention can produce a hydrogenated polymer having hydroxy group and/or a functional group which is convertible into hydroxy group or convertible into hydroxymethyl group with high retention of a functional group and can achieve a high hydrogenation ratio together with good hydrogenation rate.
DUNAMS, TAMBRA;HOEKSTRA, WILLIAM;PENTALERI, MICHAEL;LIOTTA, DENNIS, TETRAHEDRON LETT., 29,(1988) N 31, C. 3745-3748
作者:DUNAMS, TAMBRA、HOEKSTRA, WILLIAM、PENTALERI, MICHAEL、LIOTTA, DENNIS
DOI:——
日期:——
US6559241B2
申请人:——
公开号:US6559241B2
公开(公告)日:2003-05-06
A Versatile Synthesis of Vinyl-Substituted Heterocycles via Regio- and Enantioselective Pd-Catalyzed Tandem Allylic Substitution
作者:Chao Qian、Wenjun Tang
DOI:10.1021/acs.orglett.0c01490
日期:2020.6.5
We herein report a versatile, regio- and enantioselective palladium-catalyzed tandem allylicsubstitution powered by a chiral bisphosphorus ligand WingPhos with the palladium loading as low as 0.1 mol %, forming a series of chiral vinyl-substituted heterocycles, including tetrahydroquinoxalines, piperazines, dihydro-2H-benzo[b][1,4]-oxazines, and morpholines, in exellent ee’s and yields. The protocol
我们在本文中报道了一种手性双磷配体WingPhos驱动的多功能,区域和对映体选择性的钯催化串联烯丙基取代,钯载量低至0.1 mol%,形成了一系列手性乙烯基取代的杂环,包括四氢喹喔啉,哌嗪,二氢-2 H-苯并[ b ] [1,4]-恶嗪和吗啉的优异ee和收率。该方案具有易于获得的起始原料,温和的反应条件和广泛的底物范围。机制研究支持串联烯丙基取代过程。
Molecular aggregation and its applicability to synthesis. The Diels-Alder reaction