The amine catalysed dealdolization of diacetone alcohol

1966 ◽  
Vol 19 (9) ◽  
pp. 1651 ◽  
Author(s):  
RW Hay ◽  
KR Tate
Keyword(s):  
Catalytic Effect ◽  
Hydroxide Ion ◽  
Diacetone Alcohol ◽  
Amine Catalysis

The hydroxide ion catalysed decomposition of diacetone alcohol (CH3)2- C(OH)CH2COCH3 → 2CH3COCH3 has been investigated at 25� and I = 0.4M. The catalytic effect of ethylamine, diethylamine, benzylamine, and isopropylamine on the reaction has been studied. A possible mechanism for the amine catalysis involving a carbinolamine intermediate is considered.

The Diacetone Alcohol—Hydroxide Ion Reaction from the Standpoint of Ion-Dipole Theory

1944 ◽  
Vol 66 (11) ◽  
pp. 1823-1826 ◽  
Author(s):  
Edward S. Amis ◽  
George Jaffé ◽  
Ralph Theodore Overman
Keyword(s):  
Hydroxide Ion ◽  
Diacetone Alcohol

scholarly journals Kinetics of the Hydroxide Ion Catalyzed Dealdolization of Diacetone Alcohol at Normal and High Pressure.

1979 ◽  
Vol 33a ◽  
pp. 329-334 ◽  
Author(s):  
Finn Grønlund ◽  
Bjørn Andersen ◽  
Trond Rakke ◽  
Arne F. Andresen ◽  
Eberhard Hoyer ◽  
...  
Keyword(s):  
High Pressure ◽  
Hydroxide Ion ◽  
Diacetone Alcohol ◽  
Kinetics Of

Primary amine catalysis in the dealdolization of diacetone alcohol

1972 ◽  
Vol 94 (14) ◽  
pp. 5064-5069 ◽  
Author(s):  
Ralph M. Pollack ◽  
Susan Ritterstein
Keyword(s):  
Primary Amine ◽  
Diacetone Alcohol ◽  
Amine Catalysis

The Amine Catalysis of the Dealdolization of Diacetone Alcohol

1938 ◽  
Vol 60 (1) ◽  
pp. 90-94 ◽  
Author(s):  
F. H. Westheimer ◽  
Herzl Cohen
Keyword(s):  
Diacetone Alcohol ◽  
Amine Catalysis

Residual phase lignin in haft cooking related to the conditions in the cook

1997 ◽  
Vol 12 (4) ◽  
pp. 225-229
Author(s):  
Cart-in A-S. Gustavsson ◽  
Chritofer T. Lindgren ◽  
Mikael E. Lindström
Keyword(s):  
Hydrogen Sulfide ◽  
Ionic Strength ◽  
Sodium Ion ◽  
Ion Concentration ◽  
Constant Composition ◽  
Hydroxide Ion ◽  
Sulfide Ion ◽  
Residual Phase ◽  
Kraft Cooking ◽  
Very High

Abstract The amount of lignin reacting according to the slow residual phase, i.e. the residual phase lignin, is in many perspectives an interesting issue. The purpose of the present investigation was to develop a mathematical model to show how the amount of residual phase lignin in the kraft cooking of spruce chips (Picm ahies) depends on the conditions in the earlier phases of the cook. The variables studied were hydroxide ion concentration, hydrogen sulfide ion concentration and ionic strength. The liquor-to-wood ratio during pulping was very high to maintain approximately constant chemical concentrations throughout each experiment (so called "constant composition" cooks). An increase in hydroxide ion concentration andtor hydrogen sulfide ion concentration leads to a decrease in the amount of residual phase lignin, while an increase in ionic strength, i.e. sodium ion concentration, leads to an increase. A signiticant result is that the hydrogen sulfide ion concentration has a pronounced influence on the amount of residual phase lignin during a cook at a low hydroxide ion concentration. The amount of residual phase lignin expressed as % lignin on wood, L,, can be described by the following equation developed for "constant composition" cooks (when cooking with a constant sodium ion concentration of 2 mol/L): LT=0,55-0.32*[HO-](-1,3)*ln[HS-] This equation is valid for a concentration of HO- in the range from 0.17 to 1.4, and a hydrogen sulfide ion concentration from 0.07 to 0.6 mol/L.

Kinetic salt effects in the hydrolysis of ethyl malonate, methyl glutarate and ethyl adipate semiesters

1986 ◽  
Vol 51 (12) ◽  
pp. 2781-2785 ◽  
Author(s):  
M. Martín Herrera ◽  
J. J. Maraver Puig ◽  
F. Sánchez Burgos
Keyword(s):  
Salt Effect ◽  
Alkaline Media ◽  
Salt Effects ◽  
Coulombic Interaction ◽  
Hydroxide Ion ◽  
Ethyl Malonate ◽  
Hydrolysis Of

A study is made on the kinetic salt effect on the reaction of hydrolysis of several charged esters in alkaline media. The results are interpreted on the basis of the coulombic interaction, the salting in of hydroxide ion and a third component depending on size of the substrate.

Sign in / Sign up

Export Citation Format

Share Document