Results 1 to 10 of about 176 (125)

ChemInform Abstract: REACTION OF SEMICYCLIC 1,5‐DIKETONES WITH PHENYLPHOSPHINE

Chemischer Informationsdienst, 1980
AbstractDie 1,5‐Diketone (I) cyclisieren mit Phenylphosphin (II) zu 8a‐Hydroxy‐l ,2‐di‐ bzw. ‐1 ,2,4‐triphenylperhydro‐phosphinolin‐1‐onen (IIIa) bzw. (IIIb), die beide in 2 stereoisomeren Formen (aß) vorliegen.
V. I. VYSOTSKII, S. M. KALINOV, M. N. TILICHENKO   +2 more
openaire   +1 more source

Human Exploration of Mars via Earth-Mars Semicyclers

Journal of Spacecraft and Rockets, 2007
We 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
openaire   +1 more source

Norrish Type II Photo-Deacylation of Semicyclic Imides

HETEROCYCLES, 1993
The photochemical deacylation of 1,4-diacyl-2,5-piperazinediones was found to proceed through the type II ketene eliminating ...
Akira Sera, Manabu Okada, Akira Ohhata, Hiroaki Yamada, Kuniaki Itoh, Yasuo Kubo   +5 more
openaire   +1 more source

ChemInform Abstract: Semicyclic 3‐Trifloxypropen‐ and Propyniminium Triflates.

ChemInform, 1994
AbstractChemInform 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, G. MAAS, J. BOHRISCH, J. LIEBSCHER   +3 more
openaire   +1 more source

Direction of heterocyclization in the interaction of semicyclic 1,5-diketones with bifunctional nucleophiles

Chemistry of Heterocyclic Compounds, 1984
In the interaction of a series of 1-aryl-3-R-3-(2′-oxo-cycloalkyl)-1-propanones with o-aminophenol and o-phenylenediamine, depending on the structure of the reacting compounds, derivatives of 1,9a-tetra(tri)-methylene-9-oxa(aza)-4a-aza-1,2,4a,9a-tet-rahydrofluorene are formed.
L. N. Donchak, A. N. Saverchenko, V. A. Kaminskii, M. N. Tilichenko   +3 more
openaire   +1 more source

Two-Dimensional Optical Orthogonal Codes and Semicyclic Group Divisible Designs

IEEE Transactions on Information Theory, 2010
A (nxm, k, ?) two-dimensional optical orthogonal code (2-D OOC), C, is a family of nxm (0, 1)-arrays of constant weight k such that ?i=1n?j=0m-1A(i, j)B(i, j?m?) ? ? for any arrays A, B in C and any integer ? except when A = B and ? ? 0 (mod m ), where ?m denotes addition modulo m.
Jianmin Wang 0003, Jianxing Yin
openaire   +1 more source

Photochemical δ-hydrogen abstraction from acyclic and semicyclic monothioimides

J. Chem. Soc., Perkin Trans. 1, 1991
Photochemical 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, Masakazu Tohnishi, Tsutomu Fujita, Shoji Watanabe   +3 more
openaire   +1 more source

The spectrum of semicyclic holey group divisible designs with block size three

Journal of Combinatorial Designs, 2019
AbstractWe determine a necessary and sufficient condition for the existence of semicyclic holey group divisible designs with block size three and group type . New recursive constructions on semicyclic incomplete holey group divisible designs are introduced to settle this problem completely.
Lidong Wang, Tao Feng, Rong Pan, Xiaomiao Wang   +3 more
openaire   +2 more sources

ChemInform Abstract: Norrish Type II Photo‐Deacylation of Semicyclic Imides.

ChemInform, 1993
AbstractChemInform 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.
A. SERA, M. OKADA, A. OHHATA, H. YAMADA, K. ITOH, Y. KUBO   +5 more
openaire   +1 more source

ChemInform Abstract: Careful Introduction of the Nitrile Group into a Semicyclic Enamine Structure.

ChemInform, 1988
AbstractReaction of the piperidinyl‐dihydropyridines (I) with the acylisothiocyanate (II), formed in situ from benzoylchloride and KSCN, with Na‐alcoholates (or NaOH) gives the cyanomethylene compounds (IV) instead of the expected cyclization products.
F. PRAGST, J. LIEBSCHER, B. ROLOFF, E. BOCHE   +3 more
openaire   +1 more source