A series of polycyclic frameworks with fluorinated syn-facial quinoxaline sidewalls has been prepared as potential molecular tweezers for electron-rich guest compounds. Our synthetic route to the cyclooctadiene-derived scaffolds 16a-d takes advantage of the facile isolation of a novel spirocyclic precursor 9b with the crucial syn-orientation of its two alkene moieties. The crystal structure of ...

Hydrogen or mixtures containing hydrogen represent attractive gases for low-voltage switching devices because of increased arc quenching behaviour. However, fundamental electrical properties arcs in are still not well known. In this paper, first results a study DC pure at 1 bar between graphite electrodes presented low currents 8 and 16 A. The voltage current measured during contact separation....

136 Vol 29, No 3, 2009 Author References 1 Private practice, Calgary, AB, Canada 2 Myalgic Encephalomyelitis Association of Ontario, Toronto, ON, Canada and member of the National ME/FM Action Network Submitted by Ellie Stein, MD, (Chair, Program Committee) on behalf of the Planning Committee: Drs. Terrie Brandon (Family Medicine, Calgary); Brian MacIntosh (Kinesiology, University of Calgary); ...

We describe a new synthesis of the 3-chloro-(4'-methoxy)-2,2'-pyrrolylfuran segment (3) of (+)- roseophilin. The route exploits a isoxazoylpyrrole intermediate, wherein the isoxazole ring serves as a β-diketone equivalent and a directing group for palladium catalyzed chlorination of the attached pyrrole. Subsequent reduction of the N-O bond and acid promoted cyclization afords roseophilin segme...

Klein’s modular j-function is defined to be j(z) = E 4/Δ(z) = 1 q + 744 + ∞ ∑ n=1 c(n)q where z ∈ C with (z) > 0, q = exp(2iπz), E4(z) denotes the normalized Eisenstein series of weight 4 and Δ(z) is the Ramanujan’s Delta function. In this short note, we show that for each integer a ≥ 1, the interval (a, 4a(a+1)) (respectively, the interval (16a−1, (4a+1)2)) contains an integer n with n ≡ 7 (mo...

NUMBER of stocks of Drosophila melanogaster, some of which arose by A changes from wild type to Bar eye, and others by reversions or partial reversions from Bar, double-Bar or double infra-Bar toward wild type, have been accumulated in this laboratory. Most of the stocks originated in this laboratory and were obtained by irradiating males with X-rays, mating them with normal females, and select...

1 TunedIT Solutions, Zwirki i Wigury 93/3049, 02-089 Warszawa, Poland [email protected] 2 Faculty of Mathematics, Informatics and Mechanics, University of Warsaw Banacha 2, 02-097 Warszawa, Poland [email protected], [email protected] 3 Institute of Mathematics, University of Rzeszow Rejtana 16A, 35-959 Rzeszow, Poland [email protected] 4 Institute of Computer Science and Tech...

A number of 1,3,4-oxadiazole, 3-9, and 1,2,4-triazole derivatives, 13-15, were synthesized starting form the acid hydrazide 1. The 1,3,4-thiadiazole derivative 12 was prepared from the substituted phenylthiosemicarbazide derivative 11 by treatment with sulfuric acid. The aryl hydrazone derivatives 10a-c were synthesized by reaction of the hydrazide 1 with the corresponding ketones. The thioalky...