Results 81 to 90 of about 118 (112)
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Semicyclic 3‐Trifloxypropen‐ and Propyniminium Triflates
Liebigs Annalen der Chemie, 1994AbstractO‐Sulfonylation of 2‐oxomethylene‐substituted 1‐azaheterocycles 1 yields the 3‐trifloxypropeniminium triflates 2a–e in high yield. Thermal β‐elimination of triflic acid from these salts affords the propyniminium triflates (2‐ethynylcycliminium triflates) 3a–e.
Robert Reinhard +3 more
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Human Exploration of Mars via Earth-Mars Semicyclers
Journal of Spacecraft and Rockets, 2007We present an architecture for the human exploration of Mars. This architecture is characterized by the use of parking orbits at Earth and gravity assists at Mars. An interplanetary transfer vehicle cycles from Earth orbit to Marsflyby andback, eliminating the need to launch transfer vehicles from the surfaces ofEarth andMars.Necessary developments for
Damon F. Landau, James M. Longuski
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Subgroups of semicyclic n-ary groups
Journal of Mathematical Sciences, 2010zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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A Semicycle of Ground-Potential Rise
IEEE Transactions on Communications, 1972A brief description is presented of why the power utilities need communication during faults. Wire communication channels can supply this need when suitably protected. The maximum groundpotential rise is needed to select protective equipment. How this transient voltage is generated with its wave shape and duration is explained for a single phase-to ...
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ChemInform Abstract: Semicyclic Thioacetals as Synthetic Building Blocks.
ChemInform, 1991AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
J. VOSS, A. BOEGE, J.‐S. BRUNCK
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Photochemical δ-hydrogen abstraction from acyclic and semicyclic monothioimides
J. Chem. Soc., Perkin Trans. 1, 1991Photochemical δ-hydrogen abstraction from acyclic and semicyclic monothioimides have been studied. Photolysis of acyclic monothioimides possessing a benzylic hydrogen atom at the δ-position gave γ-lactams, via a 1,5-diradical intermediate, accompanied by thioamides were generated by γ-hydrogen abstraction.
Masami Sakamoto +3 more
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Norrish Type II Photo-Deacylation of Semicyclic Imides
HETEROCYCLES, 1993The photochemical deacylation of 1,4-diacyl-2,5-piperazinediones was found to proceed through the type II ketene eliminating ...
Akira Sera +5 more
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ChemInform Abstract: Semicyclic 3‐Trifloxypropen‐ and Propyniminium Triflates.
ChemInform, 1994AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
R. REINHARD +3 more
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EPC syntheses and structureâactivity relationships of hypoglycaemic semicyclic amidines
European Journal of Medicinal Chemistry, 2000A series of homochiral sterically hindered mono- and bicyclic amidines was prepared as hypoglycaemic agents by lethargic reaction of O-methylcaprolactim and 3-ethoxy-2-azabicyclo[2.2.2]oct-2-ene, respectively, with homochiral cis-2-substituted cyclopentane amines provided by asymmetrical reductive amination of racemic 2-substituted cyclopentanones. All
S, Hartmann +3 more
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Semicyclic 4-GDDs and related two-dimensional optical orthogonal codes
Designs, Codes and Cryptography, 2011zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Wang, Kun, Wang, Jianmin
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