منابع مشابه
Evaluatoin of Agglomerative Hierarchical Clustering Methods
This paper describes the findings from evaluating the performance of agglomerative hierarchical cluster methods for determining seasonal factor groups. Seasonal factor groups are usually determined by traditional cluster analysis based on various similarity measures. Agglomerative hierarchical methods merge telemetry traffic monitoring sites (TTMSs) into groups according to their similarities. ...
متن کاملPyridinium N-2 0-pyridylaminide: synthesis of 3-aryl-2-aminopyridines through an intramolecular radical process
Tris(trimethylsilyl)silane (TTMSS) and azobisisobutironitrile (AIBN) promote the intramolecular heteroarylation of arenesulfonamides with pyridyl radicals under thermal conditions. The arenesulfonamides are easily prepared from pyridinium N-2 0pyridylaminide. The heteroarylation process involves pyridyl radical cyclization and ipso substitution. q 2004 Elsevier Ltd. All rights reserved.
متن کاملRadical carbonylations using a continuous microflow system
Radical-based carbonylation reactions of alkyl halides were conducted in a microflow reactor under pressurized carbon monoxide gas. Good to excellent yields of carbonylated products were obtained via radical formylation, carbonylative cyclization and three-component coupling reactions, using tributyltin hydride or TTMSS as a radical mediator.
متن کاملA construction of 4,4-spirocyclic γ-lactams by tandem radical cyclization with carbon monoxide
A straightforward synthesis of 4,4-spirocyclic indol γ-lactams by tandem radical cyclization of iodoaryl allyl azides with CO was achieved. The reaction of iodoaryl allyl azides, TTMSS and AIBN under CO pressure (80 atm) in THF at 80 °C gave the desired 4,4-spirocyclic indoline, benzofuran, and oxindole γ-lactams in moderate to good yields.
متن کاملPreparation of various C-2 branched carbohydrates using intramolecular radical reactions.
A new and efficient method for the facile synthesis of C-2 branched carbohydrates has been developed using an intramolecular radical cyclization fragmentation reaction. The desired C-2 branched glucopyranosides were isolated in 40-84% yield. Additionally, an unexpected furanoside was obtained from a tributyltin iodide-promoted rearrangement of the radical intermediate. The C-2 formyl glycal was...
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ژورنال
عنوان ژورنال: Synlett
سال: 2007
ISSN: 0936-5214,1437-2096
DOI: 10.1055/s-2007-984873