Results 41 to 50 of about 62,467 (179)

Alternative pathways to α,β-unsaturated ketones via direct oxidative coupling transformation using Sr-doped LaCoO3 perovskite catalyst [PDF]

Royal Society Open Science, 2019
A strontium-doped lanthanum cobaltite perovskite material was prepared, and used as a recyclable and effective heterogeneous catalyst for the direct oxidative coupling of alkenes with aromatic aldehydes to produce α,β-unsaturated ketones.
Khang H. Trinh, Son H. Doan, Tien V. Huynh, Phuong H. Tran, Diep N. Pham, Minh-Vien Le, Tung T. Nguyen, Nam T. S. Phan   +7 more
doaj   +1 more source

Asymmetric carbohydroxylation of alkenes via sequential photocatalytic oxo-alkylation and enzymatic reduction

Tetrahedron Chem
Asymmetric carbohydroxylation of alkenes offers an efficient approach to access chiral alcohols, a class of versatile building blocks in pharmaceutical and agrochemical industries, from abundant simple alkenes.
Yiyin Liu, Kun Zhu, Xuemei Li, Xiaoyun Wu, Jinhui Feng, Atefeh Roosta, Qiaqing Wu, Dunming Zhu   +7 more
doaj   +1 more source

High chemoselectivity in the phenol synthesis

Beilstein Journal of Organic Chemistry, 2011
Efforts to trap early intermediates of the gold-catalyzed phenol synthesis failed. Neither inter- nor intramolecularly offered vinyl groups, ketones or alcohols were able to intercept the gold carbenoid species. This indicates that the competing steps of
Matthias Rudolph, Melissa Q. McCreery, Wolfgang Frey, A. Stephen K. Hashmi   +3 more
doaj   +1 more source

Pig Slurry Fertilization Changes the Pyrolytic Signature of Humic Substances in Calcareous Soil

Agronomy
The aim of this study was to determine the effect of progressive pig slurry (PS) rates, applied over a 12-year period, on the molecular composition of soil organic matter in a calcareous soil.
Àngela D. Bosch-Serra, Diana E. Jiménez-de-Santiago, José A. González-Pérez, Gonzalo Almendros   +3 more
doaj   +1 more source

Inter- and intramolecular enantioselective carbolithiation reactions

Beilstein Journal of Organic Chemistry, 2013
In this review we summarize recent developments in inter- and intramolecular enantioselective carbolithiation reactions carried out in the presence of a chiral ligand for lithium, such as (−)-sparteine, to promote facial selection on a C=C bond.
Asier Gómez-SanJuan, Nuria Sotomayor, Esther Lete   +2 more
doaj   +1 more source

Homologative alkene difunctionalization

Nature Chemistry
Abstract Systematic evaluation of homologous series plays a pivotal role in synthetic and medicinal chemistry 1,2 . Despite their structural resemblance, the preparation of homologs often requires individual synthetic planning tailored to distinct precursors and reactions.
Morgan Kim, So Yeon Ahn, Seongmin Kim, Junhwan Won, Dongwook Kim, Seung Youn Hong   +5 more
openaire   +2 more sources

Aminothiolation of alkenes with azoles and Bunte salts

Frontiers in Chemistry
We have developed an intermolecular aminothiolation of simple olefins using Bunte salt as a thiolating agent. This protocol produces thiyl free radicals under PIDA oxidation conditions, eliminating the need for transition-metal catalysts.
Bingqing Ouyang, Xing Chai, Zhe Li, Chunling Zhang, Xingmei Liu   +4 more
doaj   +1 more source

A Study of Alkene Disulfonoxylation

Medicinal Chemistry Research
We have developed convenient protocols for alkene disulfonoxylation, which involve stirring alkene substrate with a commercial I(III) oxidant and sulfonic acid in CH2Cl2 at ambient temperature. The reactions can be performed open to air without any special precautions to exclude moisture and, in most cases, deliver the products of vicinal ...
Shyam Sathyamoorthi, Steven P. Kelley
openaire   +2 more sources

Unified metal-free intermolecular Heck-type sulfonylation, cyanation, amination, amidation of alkenes by thianthrenation

Nature Communications
Direct and site-selective C-H functionalization of alkenes under environmentally benign conditions represents a useful and attractive yet challenging transformation to access value-added molecules.
Ming-Shang Liu, Hai-Wu Du, Huan Meng, Ying Xie, Wei Shu   +4 more
doaj   +1 more source

Visible Light-Mediated Monofluoromethylation/Acylation of Olefins by Dual Organo-Catalysis

Molecules
Monofluoromethyl (CH2F) motifs exhibit unique bioactivities and are considered privileged units in drug discovery. The radical monofluoromethylative difunctionalization of alkenes stands out as an appealing approach to access CH2F-containing compounds ...
Jiuli Xia, Yunliang Guo, Zhiguang Lv, Jiaqiong Sun, Guangfan Zheng, Qian Zhang   +5 more
doaj   +1 more source