A process for preparing letrozole, and purified letrozole.
一种用于制备来曲唑和纯化来曲唑的过程。
<i>Para</i>-Selective C–H Borylation of Common Arene Building Blocks Enabled by Ion-Pairing with a Bulky Countercation
作者:Madalina T. Mihai、Benjamin D. Williams、Robert J. Phipps
DOI:10.1021/jacs.9b07267
日期:2019.10.2
The selective functionalization of C–H bonds at the arene para position is highly challenging using transition metal catalysis. Iridium-catalyzed borylation has emerged as a leading technique for arene functionalization, but there are only a handful of strategies for para-selective borylation, which operate on specific substrate classes and use bespoke ligands or catalysts. We describe a remarkably
FLUORESCENT BRIGHTENERS, METHODS OF PREPARATION THEREOF, FLUORESCENT BRIGHTENER COMPOSITIONS, AND METHODS OF PREPARATION AND USES THEREOF
申请人:Naik Shantaram Narayan
公开号:US20110065843A1
公开(公告)日:2011-03-17
A compound of Formula (I)
wherein R
1
, R
2
, and R
3
are independently at each occurrence hydrogen, a halogen, a cyano functionality, a C
1
-C
20
aliphatic functionality, a C
3
-C
10
cycloaliphatic functionality or a C
3
-C
20
aromatic functionality, with the proviso that R
2
and R
3
are not hydrogen when R
1
is a methyl or hydrogen; R
4
and R
5
are independently at each occurrence hydrogen, a halogen, a cyano functionality, a C
1
-C
20
aliphatic functionality, a C
3
-C
10
cycloaliphatic functionality or a C
3
-C
10
aromatic functionality; R
7
and R
8
are independently at each occurrence, a halogen, a cyano functionality, a C
1
-C
20
aliphatic functionality, a C
3
-C
10
cycloaliphatic functionality or a C
3
-C
10
aromatic functionality; R
6
is a C
2
-C
20
aliphatic functionality, a C
3
-C
10
cycloaliphatic functionality or a C
3
-C
20
aromatic functionality; and “n” and “m” are each independently integers having a value of 0 to 3.
Alkene oxidation catalyzed by a ruthenium-substituted heteropolyanion, SiRu(L)W11O39: the mechanism of the periodate-mediated oxidative cleavage
作者:Ronny Neumann、Chalil Abu-Gnim
DOI:10.1021/ja00172a018
日期:1990.8
A ruthenium-substituted heteropolyanion SiRu(Hsub2}O)Wsub 11}Osub 39}sup 5minus}} was synthesized and characterized. The hydrophobic quaternary ammonium salt of the heteropolyanion ((Csub 6}Hsub 13})sub 4}N)sub 5}SiRusup III}(Hsub2}O)Wsub 11}Osub 39} was used as a catalyst for the oxidation of alkenes with tert-butyl hydroperoxide, potassium persulfate, iodosobenzene, and sodium periodate
Convenient Procedures for the Preparation of Lipophilic Quaternary Onium Fluorides, Hydrogendifluorides and Dihydrogentrifluorides via Ion Exchange in Two-Phase Systems
A series of lipophilic quaternary onium fluorides 2, hydrogendifluorides 3, and dihydrogentrifluorides 4 are easily synthesized in almost quantitative yields from the corresponding quaternary hydrogen sulfates by exchange with the appropriate anion in an organic aqueous two-phase system; alternatively quaternary salts 4 can be prepared from onium chlorides 5 or bromides 6 under the same conditions.