Aldol condensation: A simple teaching model for organic laboratory

1978 ◽  
Vol 55 (8) ◽  
pp. 540 ◽  
Author(s):  
Byron L. Hawbecker ◽  
David W. Kurtz ◽  
Theodore D. Putnam ◽  
Patricia A. Ahlers ◽  
Gregory D. Gerber
Keyword(s):  
Aldol Condensation ◽  
Teaching Model ◽  
Organic Laboratory

Michael addition and aldol condensation: A simple teaching model for organic laboratory

1986 ◽  
Vol 63 (5) ◽  
pp. 443 ◽  
Author(s):  
A. Garcia-Raso ◽  
J. Garcia-Raso ◽  
J. V. Sinisterra ◽  
R. Mestres
Keyword(s):  
Michael Addition ◽  
Aldol Condensation ◽  
Teaching Model ◽  
Organic Laboratory

scholarly journals Assessment of the Ratio of Geometric Isomers of Dibenzalacetone Spectroscopically

2019 ◽  
pp. 1-9
Author(s):  
Orwa Houshia ◽  
Abdalla Walwil ◽  
Hanan Jumaa ◽  
Hisham Qrareya ◽  
Harbi Daraghmeh ◽  
...  
Keyword(s):  
Gas Phase ◽  
Vibrational Frequency ◽  
Molar Mass ◽  
Aldol Condensation ◽  
Vibrational Modes ◽  
Geometric Isomers ◽  
Relative Ratio ◽  
Ft Ir ◽  
Organic Laboratory ◽  
Layer Chromatography

The aim of this experiment is to estimate the relative ratio of geometric isomers of Dibenzalacetone that was prepared via the crossed-aldol condensation by reacting benzaldehyde with acetone. Dibenzalacetone was synthesized in the lab from benzaldehyde and acetone under basic conditions. The GC-MS was used to relate the molar mass of the product. Thin layer chromatography was used to visualize the relative RF factor for each isomer. Uv-Vis instrument showed three peaks that were assigned to each isomer. And the FT-IR was used for the assignment of the vibrational modes of each isomer. The relative ratio of trans-trans, Cis-trans, and Cis-Cis was 59.87%, 26.53%, and 13.60% respectively with the aid of FT-IR instruments peak assignments were made for the vibrational frequency of the functional groups. For organic laboratory setups and practices, the fragments from the MS spectrum of DBA can be explained based on cleaving or rearrangement in gas phase by mechanisms known as α-cleavage, β-cleavage, and Rearrangement migration.

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.

An Innovative Study Abroad Teaching Model In Resource-Strapped Times

2006 ◽  
Author(s):  
Doris I. Cancel-Tirado ◽  
Shannon B. Wanless ◽  
Lizbeth A. Gray ◽  
Clara C. Pratt
Keyword(s):  
Study Abroad ◽  
Teaching Model

Training Institutes: The Teaching Model

2007 ◽  
Author(s):  
Paul Landen ◽  
Valerie Gifford
Keyword(s):  
Teaching Model

PENERAPAN MODEL QUANTUM TEACHING UNTUK MENINGKATKAN HASIL BELAJAR PKn SISWA KELAS IV SD NEGERI 19 BALIK ALAM KECAMATAN MANDAU

2017 ◽  
Vol 6 (2) ◽  
pp. 461
Author(s):  
Eltrizar Eltrizar
Keyword(s):  
Learning Outcomes ◽  
Fourth Grade ◽  
Student Learning Outcomes ◽  
Class Action ◽  
Teaching Model ◽  
Percentage Increase ◽  
Average Percentage ◽  
Average Grade ◽  
Fourth Grade Students ◽  
Teaching Learning

The problem in this research is the low of Civics learning outcomes in fourth grade (IV) SD Negeri 19 Balik Alam, this can be seen from the average grade, that is 66,23 (with KKM 70). The purpose of this study is to improve the results of learning Civics fourth grade students SD Negeri 19 Balik Alam with the application of quantum teaching learning model. This research is a class action research (PTK) with 2 cycles. Based on data analysis of research results after applying quantum teaching model, the average percentage of teacher activity in cycle I 66.66% increased to 85.4% in cycle II. The average percentage of student activity also increased by 56.25% in the first cycle increased to 87.49% in cycle II. Student learning outcomes on the basic score with the average class 66,23 and in the first cycle has increased with the average grade grade 71.11 with the percentage increase in learning outcomes 8.87% and the percentage of students who complete 73.07%, and on the second cycle increased again with the average class of 77.60 with the percentage increase in learning outcomes 17.16% and the percentage of students who complete 84.61%. The results of this study showed that the application of quantum teaching model can improve the learning outcomes of fourth grade students of SD Negeri 19 Balik Alam.

Sign in / Sign up

Export Citation Format

Share Document