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Articles 30061 - 30090 of 35975
Full-Text Articles in Entire DC Network
Pyrrolidine From N-Alkyl-N-Chloroureas (Abstract), George H. Coleman, Glen Alliger
Pyrrolidine From N-Alkyl-N-Chloroureas (Abstract), George H. Coleman, Glen Alliger
Proceedings of the Iowa Academy of Science
Previous work in this laboratory has shown that when N-n-buty 1-N -chloro-p-toluenesulfonamide, N-n-butyl-N-chloroacetamide, or N-n-butyl-N-chloropropionamide is dissolved in sulfuric acid and heated, ring closure occurs with the formation of pyrrolidine in good yields. It was thought that N, N'-di-n-butyl-N, N'- dichlorourea might react in a similar manner. This was found to be the case. When this compound was dissolved in 95 per cent sulfuric acid and heated for a period of one hour at 120-130° C. pyrrolidine was formed in yields of 50 to 55 per cent. Under similar conditions N, N-dimethyl-N'-n-butyl-N'-chlorourea gave pyrrolidine in yields of 5 to 10 …
Action Of Thionyl Chloride On Urethanes (Abstract), H. B. Freyermuth, L. Chas. Raiford
Action Of Thionyl Chloride On Urethanes (Abstract), H. B. Freyermuth, L. Chas. Raiford
Proceedings of the Iowa Academy of Science
Raiford and Shelton [J. Org. Chem., 4, 207 (1939)] found that hot pyridine causes 2-carbophenoxyamino-4-methy 1-6-bromophenyl p-tolylsulfonate to lose phenol and give a "condensation product" which was found to be a 1,3- derivative of uretedione (uretidone). This type of derivative was also obtained by Warren and Wilson [Ber., 68, 957 (1935) J by the action of thionyl chloride on phenylurethane. But it has now been found that the last-named reaction is specific for phenylure thane. When the phenyl radical contains a "negative" substituent, thionyl chloride causes no action after five hours refluxing. If the substituent is alkyl the treatment causes …
The Action Of The Ethanolamines On Cornstalk Lignin (Abstract), Elton Fisher
The Action Of The Ethanolamines On Cornstalk Lignin (Abstract), Elton Fisher
Proceedings of the Iowa Academy of Science
No abstract provided.
Measurement Of Adsorption Isotherms For Mixed Vapors, H. H. Rowley, W. B. Innes
Measurement Of Adsorption Isotherms For Mixed Vapors, H. H. Rowley, W. B. Innes
Proceedings of the Iowa Academy of Science
A great deal of work has been done in the measurement of adsorption isotherms of pure gases and vapors, but very little of the measurement of adsorption isotherms of mixed gases or vapors and much of this has been unintentional, being due to impurities in the adsorbate. Papers dealing with measurements of this type include those of Richardson and Woodhouse (2) and Bakr and King. (3) The method of Bakr and King has the objection that each experiment yields an isolated value. Richardson's and Woodhouse’s method requires extensive gas analysis and yields an isotherm in which the composition of the …
A Method Of Maintaining The Proper Copper Concentration In The Treatment Of Water, O. R. Sweeney, O. G. Fife
A Method Of Maintaining The Proper Copper Concentration In The Treatment Of Water, O. R. Sweeney, O. G. Fife
Proceedings of the Iowa Academy of Science
When water is impounded in a reservoir it usually becomes infested with algae. 'While not poisonous many of these algae impart disagreeable odors or tastes to the water, making it undesirable for drinking purposes. When the Croton dam was built as a part of the New York City water supply system, the water in the reservoir behind it became contaminated with algae. Upon the recommendation of Karl F. Kellerman, whose father, Professor Kellerman of Ohio State University, first noted the toxic effect of copper on algae, the water was treated with copper sulfate. This was effective and is being used …
A Rapid Method Of Correcting Fuel Value Determinations Using The Oxygen Bomb Calorimeter, Herbert T. Bates
A Rapid Method Of Correcting Fuel Value Determinations Using The Oxygen Bomb Calorimeter, Herbert T. Bates
Proceedings of the Iowa Academy of Science
In making fuel value determinations with the oxygen bomb calorimeter it is necessary to correct the observed fuel value by subtracting the heat of combustion of the fuse wire and the heats of formation of the acids present after combustion. Nitric and sulfuric acids are formed by the following reactions which are not possible in furnace combustion.
Prairie (Illustrated), Selma Williams
Dead Men's Shoes, Virginia Nauman
Going Home For Christmas, Mona Jane Van Duyn
The Purple Pen, Volume 13, Number 1, November 1940 [Download Entire Issue]
The Purple Pen, Volume 13, Number 1, November 1940 [Download Entire Issue]
Purple Pen
No abstract provided.
Front Matter - Table Of Contents
Match Point, James Van Houten
Election Day, 1860, Marguerite Tinsley
Fall Plowing, Roland E. Mitchell
Florien Slappey, Gordon Sanders
Trouble Came, Jack J. Graber
Sonnet, Alene Dunlap
Brownie, Helen Wagoner
Allusions In Paul Engle's Poetry, Wilma Isley
There's A Salt Wind Blowing, Gwendolyn Wescott
Desire, Helen Thomas
A Day Begins, Julia Entz
Lunch, Helen Thomas
Eliza Switzer, Winifred Mcmillan
The Magic Hat, Hattie Bock
Probable Fifth Column, Dugan Laird
Dis Science (Illustrated), Margaret L. Anderson
The Girl Takes Stock Of Nineteen Years, Mona Jane Van Duyn
The Girl Takes Stock Of Nineteen Years, Mona Jane Van Duyn
Purple Pen
No abstract provided.
Melodies, Norma Bollhoefer
Turmoil, Lee F. Parman