Methylene C(sp<sup>3</sup>)–H Arylation of Aliphatic Ketones Using a Transient Directing Group
作者:Kai Hong、Hojoon Park、Jin-Quan Yu
DOI:10.1021/acscatal.7b02905
日期:2017.10.6
Palladium-catalyzed methylene β-C(sp3)–Harylation of aliphatic ketones using a transient directing group is developed. The use of α-benzyl β-alanine directing group that forms a six-membered chelation with palladium is crucial for promoting the methylene C(sp3)–H bond activation.
Versatile Alkylation of (Hetero)Aryl Iodides with Ketones via β-C(sp<sup>3</sup>)–H Activation
作者:Ru-Yi Zhu、Luo-Yan Liu、Han Seul Park、Kai Hong、Yongwei Wu、Chris H. Senanayake、Jin-Quan Yu
DOI:10.1021/jacs.7b09761
日期:2017.11.15
We report Pd(II)-catalyzed β-C(sp3)-H (hetero)arylation of a variety of ketones using a commercially available 2,2-dimethyl aminooxyacetic acid auxiliary. Facile installation and removal of the auxiliary as well as its superior scope for both ketones and (hetero)aryl iodides overcome the significant limitations of the previously reported β-C(sp3)-H arylation of ketones. The ready availability of ketones
Oxidation of aliphatic alcohols with the lead tetraacetate—metal halide system under mechanical activation
作者:N. I. Kapustina、V. D. Makhaev、A. P. Borisov、G. I. Nikishin
DOI:10.1007/bf02494921
日期:2000.11
The mechanochemical oxidation ofn-pentanol,n-hexanol, andn-octanol with the Pb(OAc)4-MHal system (M=Li, K; Hal=Cl, Br) in the absence of a solvent affords esters. and secondary alcohols with the composition C8H17OH and C9H19OH give ketones.
Compositions and Methods for Fermentation of Biomass
申请人:Parekh Sarad
公开号:US20100268000A1
公开(公告)日:2010-10-21
In one aspect, this invention relates to production of useful fermentation end-products from biomass through simultaneous hydrolysis and fermentation by a microorganism, such as
Clostridium phytofermentans
. The invention also relates to the development of a process for efficient pretreatment and conversion of lignocellulosic biomass to end-products with high conversion efficiency (yield). In another aspect, methods for producing a fermentation end-product by fermenting hexose (C6) and pentose (C5) sugars with a microorganism, such as
Clostridium phytofermentans
are disclosed herein.
Crystalline forms of almotriptan and processes for their preparation
申请人:Sridharan Ramasubramanian
公开号:US20070112055A1
公开(公告)日:2007-05-17
Crystalline forms of almotriptan and almotriptan malate are disclosed. Processes for their preparation and pharmaceutical compositions containing the same are also disclosed. The amorphous form of almotriptan malate, processes for its preparation and a pharmaceutical composition containing the same are also disclosed