A5074241737- Chemical Synthesis and Reactions
- Chemical Synthesis and Analysis
- Chemical Reaction Mechanisms
- Asymmetric Synthesis and Catalysis
- Synthesis and Catalytic Reactions
- Air Traffic Management and Optimization
- Fluorine in Organic Chemistry
- Synthesis and Biological Evaluation
- Synthetic Organic Chemistry Methods
- Organic and Inorganic Chemical Reactions
- Aviation Industry Analysis and Trends
- Synthesis and Reactions of Organic Compounds
- Inorganic and Organometallic Chemistry
- Oxidative Organic Chemistry Reactions
- Organic Chemistry Cycloaddition Reactions
- Sulfur-Based Synthesis Techniques
- Legal Studies and Policies
- Carbohydrate Chemistry and Synthesis
- Human-Automation Interaction and Safety
- Asymmetric Hydrogenation and Catalysis
- Synthesis of β-Lactam Compounds
- Chemical Reactions and Mechanisms
- Traffic control and management
- Click Chemistry and Applications
- Various Chemistry Research Topics
Universitas Sumatera Utara
2022-2024
Universitas Kapuas Sintang
2019-2021
Metron (United States)
2003-2019
Iowa State University
2018
New Mexico State University
1998-2016
The University of Texas at El Paso
1998-2010
Forest and Rangeland Ecosystem Science Center
2008
United States Geological Survey
2008
Oregon State University
1998-1999
Ospedali Riuniti di Ancona
1987
The publication of this article is supported by the Open Access Publishing Fund International Association for Knowledge on Invasive Alien Species (INVASIVESNET; www.invasivesnet.org). Stelios Katsanevakis, Maria Sini and Konstantinos Tsirintanis were Hellenic Foundation Research Innovation (H.F.R.I.) under “First Call H.F.R.I. Projects to support Faculty members Researchers procurement high-cost research equipment grant” (Project Number: HFRI-FM17-1597). Enalia Physis acknowledges Pantelis...
In this paper, we analyze a generalization of classic network-flow model. The involves the replacement deterministic demand with stochastic demand. While destroys original network structure, show that matrix underlying model is dual network. Thus, integer program associated can be solved efficiently using or linear-programming techniques. We also develop an application to ground-holding problem in air-traffic management. use for improves upon prior models by allowing easy integration into...
This paper presents ration-by-distance (RBD), a new allocation method to be used in planning ground delay programs (GDPs) for traffic flow management. It is shown that RBD minimizes total expected delay, under certain assumptions related the manner which GDPs are dynamically controlled. On other hand, taken extreme has poor characteristics with respect equity of it produces. To address this issue, we propose constrained version as practical alternative procedures operations today. algorithm...
The reduction of N-protected amino ketones can be carried stereoselectively to produce either the syn- or anti-amino alcohol diastereomer. Carbamate-protected reduced predictably and selectively alcohols with LiAlH(O-t-Bu)3 in ethanol at -78 degrees C. N-Trityl-protected syn-amino THF -5
The larval stage of the long‐toed salamander (Ambystoma macrodactylum) is top vertebrate predator in high‐elevation fishless lakes North Cascades National Park Service Complex, Washington (U.S.A.). Although most these were naturally fishless, trout have been stocked many them. We sought to determine effects physicochemical factors and introduced on abundance behavior A. macrodactylum larvae. Larval densities estimated by snorkeling. Snorkelers carefully searched through substrate materials...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of (2- and 3-furyl)methylenes 3-thienyl)methylenesRobert V. Hoffman, Gus. G. Orphanides, Harold ShechterCite this: J. Am. Chem. Soc. 1978, 100, 25, 7927–7933Publication Date (Print):December 1, 1978Publication History Published online1 May 2002Published inissue 1 December 1978https://pubs.acs.org/doi/10.1021/ja00493a023https://doi.org/10.1021/ja00493a023research-articleACS PublicationsRequest reuse permissionsArticle...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnhydrous copper(II) sulfate: an efficient catalyst for the liquid-phase dehydration of alcoholsRobert V. Hoffman, Richard D. Bishop, Patricia M. Fitch, and HardensteinCite this: J. Org. Chem. 1980, 45, 5, 917–919Publication Date (Print):February 1, 1980Publication History Published online1 May 2002Published inissue 1 February 1980https://pubs.acs.org/doi/10.1021/jo01293a030https://doi.org/10.1021/jo01293a030research-articleACS PublicationsRequest...
A primary objective of the FAA's ATM functions is to provide fair and equitable access National Airspace System. Traditionally, FAA has interpreted fairness as prioritizing flights on a "first-come, first-served" basis. The allocation procedures introduced under Collaborative Decision Making (CDM), however, represent departure from this paradigm: allocations are based carriers' original flight schedules. concept CDM largely left implicit in procedures. Different even conflicting concepts...
Both the single-airport ground-holding problem (GH) and multi-airport can be extended by addition of banking constraints to accommodate hubbing operations major airlines. These enforce desire airlines land certain groups flights, called banks, within fixed time windows, thus preventing propagation delays throughout their entire operation. GH formulated as a transportation readily solved. But in presence constraints, becomes difficult integer programming problem. In this paper, we construct...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of chlorination aromatic compounds adsorbed on the surface fly ash from municipal incineratorsRobert V. Hoffman, Gary A. Eiceman, Yao Ting Long, Margaret C. Collins, and Mao Qin LuCite this: Environ. Sci. Technol. 1990, 24, 11, 1635–1641Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBase-promoted, imine-forming 1,2-elimination reactionsRobert V. Hoffman, Richard A. Bartsch, and Bong Rae ChoCite this: Acc. Chem. Res. 1989, 22, 6, 211–217Publication Date (Print):June 1, 1989Publication History Published online1 May 2002Published inissue 1 June 1989https://pubs.acs.org/doi/10.1021/ar00162a003https://doi.org/10.1021/ar00162a003research-articleACS PublicationsRequest reuse permissionsArticle Views411Altmetric-Citations36LEARN ABOUT...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRing-opening reactions of furfurylidenesRobert V. Hoffman and Harold ShechterCite this: J. Am. Chem. Soc. 1971, 93, 22, 5940–5941Publication Date (Print):November 1, 1971Publication History Published online1 May 2002Published inissue 1 November 1971https://pubs.acs.org/doi/10.1021/ja00751a082https://doi.org/10.1021/ja00751a082research-articleACS PublicationsRequest reuse permissionsArticle Views260Altmetric-Citations43LEARN ABOUT THESE...
A series of P2-modified, orally active peptidic inhibitors human neutrophil elastase (HNE) are reported. These pentafluoroethyl ketone-based were designed using ketone 1 as a model. Rational structural modifications made at the P3, P2, and activating group (AG) portions based on structure−activity relationships (SAR) developed from in vitro (measured Ki) data information provided by modeling studies that docked inhibitor into site HNE. The modeling-based design was corroborated with X-ray...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbenic, cationic, metal ion catalyzed, and photolytic decompositions of ethyl (2-furyl)diazoacetateRobert V. Hoffman Harold ShechterCite this: J. Am. Chem. Soc. 1978, 100, 25, 7934–7940Publication Date (Print):December 1, 1978Publication History Published online1 May 2002Published inissue 1 December 1978https://pubs.acs.org/doi/10.1021/ja00493a024https://doi.org/10.1021/ja00493a024research-articleACS PublicationsRequest reuse permissionsArticle...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBase-Promoted Reactions of .alpha.-Azido Ketones with Aldehydes and Ketones: A Novel Entry to .alpha.-Azido-.beta.-hydroxy 2,5-Dihydro-5-hydroxyoxazolesTamas Patonay Robert V. HoffmanCite this: J. Org. Chem. 1995, 60, 8, 2368–2377Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published inissue 1 April 1995https://pubs.acs.org/doi/10.1021/jo00113a015https://doi.org/10.1021/jo00113a015research-articleACS...
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTAn Improved Enantiospecific Synthesis of Statine and Analogs via 4-(N,N-Dibenzylamino)-3-keto EstersRobert V. Hoffman Junhua TaoView Author Information Department Chemistry Biochemistry, New Mexico State University, Las Cruces, 88003-0001 Cite this: J. Org. Chem. 1997, 62, 7, 2292–2297Publication Date (Web):April 4, 1997Publication History Received25 September 1996Published online4 April 1997Published inissue 1...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe reactions of .alpha.-arylsulfonoxy ketones with nucleophilesRobert V. Hoffman, Bryan C. Jankowski, Sean Carr, and Eileen N. DueslerCite this: J. Org. Chem. 1986, 51, 2, 130–135Publication Date (Print):January 1, 1986Publication History Published online1 May 2002Published inissue 1 January 1986https://pubs.acs.org/doi/10.1021/jo00352a002https://doi.org/10.1021/jo00352a002research-articleACS PublicationsRequest reuse permissionsArticle...
A simple and efficient method for the synthesis of anti-N-protected amino epoxides from carbamate-protected acids is described. The two key steps are monobromination a β-ketoester chelation-controlled reduction bromomethyl ketone intermediate. Good overall yields, high diastereoselectivity, excellent functional group compatibility characteristic.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIonization of N-arylsulfonyloxy amines: the nitrenium ion questionRobert V. Hoffman, Anil Kumar, and Gregory A. BuntainCite this: J. Am. Chem. Soc. 1985, 107, 16, 4731–4736Publication Date (Print):August 1, 1985Publication History Published online1 May 2002Published inissue 1 August 1985https://pubs.acs.org/doi/10.1021/ja00302a022https://doi.org/10.1021/ja00302a022research-articleACS PublicationsRequest reuse permissionsArticle...