scholarly journals Aldol Condensation-Type Group Transfer Copolymerizations of Silyl (Di)Enolates

1995 ◽  
Vol 27 (1) ◽  
pp. 34-48 ◽  
Author(s):  
Hiroshi Sumi ◽  
Kenji Ishikawa ◽  
Yoshihito Inai ◽  
Tadamichi Hirabayashi ◽  
Kenji Yokota
Keyword(s):  
Aldol Condensation ◽  
Group Transfer ◽  
Type Group

scholarly journals Microstructures of Poly(1-butadienyloxytrimethylsilane)s Prepared by Aldol Condensation-Type Group Transfer Polymerization

1995 ◽  
Vol 27 (1) ◽  
pp. 26-33
Author(s):  
Hiroshi Sumi ◽  
Kenji Haraguchi ◽  
Yoshihito Inai ◽  
Tadamichi Hirabayashi ◽  
Kenji Yokota
Keyword(s):  
Aldol Condensation ◽  
Group Transfer ◽  
Type Group

Characterization of Chemical Impurities in Glutaraldehyde

1975 ◽  
Vol 33 ◽  
pp. 620-621
Author(s):  
B. J. Grenon ◽  
A. J. Tousimis
Keyword(s):  
Glutaric Acid ◽  
Spectroscopic Analysis ◽  
Aldol Condensation ◽  
Condensation Product ◽  
Amorphous Solid ◽  
Water Soluble ◽  
Impurity Component ◽  
Chemical Impurities ◽  
Soluble Liquid

Ever since the introduction of glutaraldehyde as a fixative in electron microscopy of biological specimens, the identification of impurities and consequently their effects on biologic ultrastructure have been under investigation. Several reports postulate that the impurities of glutaraldehyde, used as a fixative, are glutaric acid, glutaraldehyde polymer, acrolein and glutaraldoxime.Analysis of commercially available biological or technical grade glutaraldehyde revealed two major impurity components, none of which has been reported. The first compound is a colorless, water-soluble liquid with a boiling point of 42°C at 16 mm. Utilizing Nuclear Magnetic Resonance (NMR) spectroscopic analysis, this compound has been identified to be — dihydro-2-ethoxy 2H-pyran. This impurity component of the glutaraldehyde biological or technical grades has an UV absorption peak at 235nm. The second compound is a white amorphous solid which is insoluble in water and has a melting point of 80-82°C. Initial chemical analysis indicates that this compound is an aldol condensation product(s) of glutaraldehyde.

PENINGKATAN HASIL BELAJAR MAHASISWA PADA MATA KULIAH MANAJEMEN KELAS DENGAN PENERAPAN MODEL PEMBELAJARAN KOOPERATIF TIPE GROUP INVESTIGATION PROGRAM STUDI PENDIDIKAN GURU SEKOLAH DASAR UNIVERSITAS RIAU

2016 ◽  
Vol 5 (1) ◽  
pp. 1
Author(s):  
Hendri Marhadi ◽  
Erlisnawati '
Keyword(s):  
Action Research ◽  
Cooperative Learning ◽  
Learning Model ◽  
Model Type ◽  
Type Group ◽  
Average Value ◽  
Classroom Action Research

Problem in this research was students achievement still low with average value 64,13. The purpose of this research was to improve the students’ achievement of in Management Class with the implementation of cooperative learning model type group investigation. This research was an classroom action research with two cycles in third semester 2014/2015. After implementation of cooperative learning model type group investigation, students’ achievement average on UH I with average 70,28 improved 9,6%. Students’ achievement on UH II was average 78,15 that improved 21,9%. Teacher’s activities with the implementation of cooperative learning model type group investigation in first meeting of first cycle was 62,5& (good category), and second meeting 78% (good category) in second meeting that improved 12,5 point. At second cycle, teacher’s activities in first meeting was 87,5% (verygood category) that improved 9,38 point from second meeting of first cycle. In second meeting was 93,8% (verygood category) which improved 6,3 point. Students’ activities in first meeting of first cycle was 65,6% (good category), and meeting second 75% (good category) in second meeting that improved 9,4 point. At second cycle, students’ activities in first meeting was 81% (very good category) that improved 6 point from second meeting of first cycle. Second meeting cycle second 90,6% (verygood category) in second meeting, which improved 9,6 point. Implementation of cooperative learning model type group investigation can improved students’ achievement in management class.Keywords: cooperatif group investigation, students achievement

Unexpected isolation of a cyclohexenone derivative

2019 ◽  
Vol 74 (11-12) ◽  
pp. 819-824
Author(s):  
Jürgen Voss ◽  
Rüdiger Röske ◽  
Gunnar Ehrlich ◽  
Gunadi Adiwidjaja
Keyword(s):  
Structure Determination ◽  
Aldol Condensation ◽  
Knoevenagel Reaction ◽  
X Ray

AbstractKnoevenagel reaction of pivaloylacetone with formaldehyde and subsequent aldol condensation ends up with 3-methyl-4,6-dipivaloylcyclohex-2-enone. The structure of the product is proved by an X-ray structure determination.

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