Stepwise Procedures Involving Friedel–Crafts-Type Alkylation of 3-Bromophthalides with Benzenes To Form 3-Arylphthalides

2006 ◽  
pp. 1
Author(s):  
K. Krohn ◽  
N. Böker
Keyword(s):  
Stepwise Procedures

scholarly journals The first in situ synthesis of 1,3-dioxan-5-one derivatives and their direct use in Claisen-Schmidt reactions

2019 ◽  
Vol 25 (1) ◽  
pp. 85-90 ◽  
Author(s):  
M. Javad Poursharifi ◽  
Mohammad M. Mojtahedi ◽  
M. Saeed Abaee ◽  
Mohammad M. Hashemi
Keyword(s):  
Acetic Acid ◽  
Aromatic Aldehydes ◽  
In Situ Synthesis ◽  
Stepwise Procedures ◽  
Time Periods ◽  
High Yields ◽  
Short Time ◽  
Direct Use ◽  
Derivatives Of

AbstractA method is developed for in situ generation of 1,3-dioxan-5-one derivatives 2. These compounds are simple precursors for accessing carbohydrate structures and previously had to be produced via stepwise procedures using excessive amounts of reagents. In the present work, three different derivatives of 2 were synthesized via the reaction of trialkoxyalkanes with dihydroxyacetone dimer 1 in the presence of acetic acid as the catalyst. In the same pot, derivatives of 2 were reacted with aromatic aldehydes and 30 mol% of pyrrolidine to obtain high yields of the respective bischalcones 3 within short time periods.

Stepwise and Simultaneous Multiple Comparison Procedures of Repeated Measures’ Means

1994 ◽  
Vol 19 (2) ◽  
pp. 127-162 ◽  
Author(s):  
H. J. Keselman
Keyword(s):  
Repeated Measures ◽  
Type I Error ◽  
Multiple Comparison ◽  
Multivariate Normality ◽  
Type I ◽  
Stepwise Procedures ◽  
Multiple Comparison Procedures ◽  
Multisample Sphericity

Stepwise multiple comparison procedures (MCPs) for repeated measures’ means based on the methods of Hayter (1986) , Hochberg (1988) , Peritz (1970) , Ryan (1960) - Welsch (1977a) , Shaffer (1979 , 1986) , and Welsch (1977a) were compared for their overall familywise rates of Type I error when multisample sphericity and multivariate normality were not satisfied. Robust stepwise procedures were identified by Keselman, Keselman, and Shaffer (1991) with respect to three definitions of power. On average, Welsh’s (1977a) step-up procedure was found to be the most powerful MCP.

scholarly journals Letter to the editor: influenza-associated mortality and oseltamivir: beware of misstepping into stepwise procedures

2019 ◽  
Vol 24 (46) ◽  
Author(s):  
Theodore Lytras ◽  
Stefanos Bonovas ◽  
Georgios K. Nikolopoulos ◽  
Sotirios Tsiodras
Keyword(s):  
Letter To The Editor ◽  
Stepwise Procedures

A Marketer'S Guide to Log-Linear Models for Qualitative Data Analysis

1980 ◽  
Vol 44 (3) ◽  
pp. 40-51 ◽  
Author(s):  
Wayne S. DeSarbo ◽  
David K. Hildebrand
Keyword(s):  
Data Analysis ◽  
Qualitative Data ◽  
Potential Problem ◽  
Linear Models ◽  
Model Fitting ◽  
Qualitative Data Analysis ◽  
Chi Square ◽  
Stepwise Procedures ◽  
Log Linear

This article presents a brief description of the development and use of log-linear models. Current research in areas of screening effects, partitioning chi-square statistics, stepwise procedures, and model fitting and selection is discussed. An analysis of inherent model ambiguities is provided, identifying potential problem areas for marketing applications.

Grossing-A Review on Stepwise Procedures

2019 ◽  
Vol 10 (11) ◽  
pp. 3162
Author(s):  
L. Malathi ◽  
N. Aravindha Babu ◽  
P. Sangeetha Priya ◽  
K. M. K. Masthan
Keyword(s):  
Stepwise Procedures

2-Haloethyl 1-Thioglycosides as New Tools in Glycoside Syntheses. Part 1: Preparation, Characteristics, General Reactions

2004 ◽  
Vol 69 (10) ◽  
pp. 1843-1876 ◽  
Author(s):  
Andreas Krüger ◽  
Jutta Pyplo-Schnieders ◽  
Hartmut Redlich ◽  
Pär Winkelmann
Keyword(s):  
Lewis Acids ◽  
Initial Step ◽  
Glycoside Synthesis ◽  
Silver Salts ◽  
Stepwise Procedures ◽  
Leaving Groups ◽  
Basic Features ◽  
New System

2-Haloethyl 1-thioglycosides are excellent leaving groups when the 2-haloethyl function is activated with silver salts or Lewis acids. These thioglycosides can be synthesized on the original Černý route or for better compatibility with the needs of a more complex glycoside synthesis, in stepwise procedures via 2-(2-tetrahydropyran-2-yloxy)ethyl glycosides or trityl 1-thioglycosides. The initial step in glycosidation reaction presumably proceeds via a thiiranium ion, which is responsible for their increased reactivity compared with normal thioethers as leaving groups in glycoside syntheses. Basic features of this new system with respect to reactivity and selectivity in disaccharide syntheses are described.

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