Oxorhenium Complexes for Catalytic Hydrosilylation and Hydrolytic Hydrogen Production: A Multiweek Advanced Laboratory Experiment for Undergraduate Students
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| Title: | Oxorhenium Complexes for Catalytic Hydrosilylation and Hydrolytic Hydrogen Production: A Multiweek Advanced Laboratory Experiment for Undergraduate Students |
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| Language: | English |
| Authors: | Ison, A. (ORCID |
| Source: | Journal of Chemical Education. Jun 2017 94(6):790-794. |
| Availability: | Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc |
| Peer Reviewed: | Y |
| Page Count: | 5 |
| Publication Date: | 2017 |
| Intended Audience: | Teachers |
| Document Type: | Journal Articles Reports - Descriptive |
| Education Level: | Higher Education Postsecondary Education |
| Descriptors: | Science Instruction, College Science, Undergraduate Study, Chemistry, Scientific Concepts, Kinetics, Spectroscopy, Teaching Methods, Laboratory Experiments, Science Experiments, Science Laboratories |
| Geographic Terms: | North Carolina |
| DOI: | 10.1021/acs.jchemed.6b00954 |
| ISSN: | 0021-9584 |
| Abstract: | An effective way of teaching undergraduates a full complement of research skills is through a multiweek advanced laboratory experiment. Here we outline a comprehensive set of experiments adapted from current primary literature focusing on organic and inorganic synthesis, catalysis, reactivity, and reaction kinetics. The catalyst, bis(2-(2'-hydroxyphenyl)-2-oxazoline)oxorhenium(V) tetrapentafluorophenylborate (1) is isolated through a multistep reaction starting with the formation of the ligand, 2-(2'-hydroxyphenyl)-2-oxazoline (2), followed by complexation of a Re-oxo precursor to form chlorobis(2-(2'-hydroxyphenyl)-2-oxazoline)oxorhenium(V) (3). Both Re(V)-oxo complexes are diamagnetic and allow for NMR analysis. Complex 1 is an air-stable and highly active catalyst for two reactions: (1) hydrosilylation of carbonyls and (2) hydrolysis of Et[subscript 3]SiH to form Et[subscript 3]SiOH and H[subscript 2] gas. Students monitor the evolution of hydrogen gas in the second reaction and use the data to investigate the reaction kinetics in order to obtain the complete rate law and the second-order rate constant for the catalytic reaction. The complete project provides a wealth of opportunities to focus on experimental skills, fundamental concepts in inorganic and organic chemistry, catalysis, reactivity, and experimental kinetics. |
| Abstractor: | As Provided |
| Number of References: | 22 |
| Entry Date: | 2017 |
| Accession Number: | EJ1145960 |
| Database: | ERIC |
| Abstract: | An effective way of teaching undergraduates a full complement of research skills is through a multiweek advanced laboratory experiment. Here we outline a comprehensive set of experiments adapted from current primary literature focusing on organic and inorganic synthesis, catalysis, reactivity, and reaction kinetics. The catalyst, bis(2-(2'-hydroxyphenyl)-2-oxazoline)oxorhenium(V) tetrapentafluorophenylborate (1) is isolated through a multistep reaction starting with the formation of the ligand, 2-(2'-hydroxyphenyl)-2-oxazoline (2), followed by complexation of a Re-oxo precursor to form chlorobis(2-(2'-hydroxyphenyl)-2-oxazoline)oxorhenium(V) (3). Both Re(V)-oxo complexes are diamagnetic and allow for NMR analysis. Complex 1 is an air-stable and highly active catalyst for two reactions: (1) hydrosilylation of carbonyls and (2) hydrolysis of Et[subscript 3]SiH to form Et[subscript 3]SiOH and H[subscript 2] gas. Students monitor the evolution of hydrogen gas in the second reaction and use the data to investigate the reaction kinetics in order to obtain the complete rate law and the second-order rate constant for the catalytic reaction. The complete project provides a wealth of opportunities to focus on experimental skills, fundamental concepts in inorganic and organic chemistry, catalysis, reactivity, and experimental kinetics. |
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| ISSN: | 0021-9584 |
| DOI: | 10.1021/acs.jchemed.6b00954 |
