Products of the reaction of anabasine with phosgene
ConclusionsThe reaction of anabasine with phosgene has given the anabasinium salt of phosgene, anabasine-N-carbonyl chloride, and the urea derivative N,N′-carbonyldianabasine. In addition to the formation of these substances, the pyridine ring of anabasine is cleaved, giving the red substance 1-chloro-5-chloroformyl-amino-2-piperidin-2-yl)penta-1,3-diene.
Synthesen mit Hilfe des Dipyridiniumsalzes des Phosgens
Das Anlagerungsprodukt von Phosgen an Pyridin wurde als Dipyridiniumsalz des Kohlenoxychlorids im Sinne von Krohnke 1) erkannt. Die Substanz eignet sich im Laboratorium fur alle in der Phosgenchemie bisher bekannt gewordenen Reaktionen und zeichnet sich durch ihre besonders einfache Handhabung aus.
Atmospheric drag effects on the KOMPSAT-1 satellite during geomagnetic superstorms
We examine the atmospheric drag on the low earth-orbiting satellite, KOMPSAT-1 in a sun-synchronous orbit at ~685-km altitude starting in 1999, during a 3-month (October-December) period in 2003. This 3-month interval includes the October 29-30 and November 20 magnetic superstorms and weak to moderate storms. We observed that the daily KOMPSAT-1 drag acceleration transiently responses to transient storm-time disturbances. That is, there is an one-to-one correspondence between the KOMPSAT-1 drag accelerations and the storm events. We find that the drag acceleration correlates strongly with the level of geomagnetic disturbance. This indicates that the trajectory of KOMPSAT-1 is significantly perturbed during extremely disturbed intervals because of atmospheric density increase. The main contributor to the density increase is Joule heating associated with the geomagnetic activity rather than the solar EUV radiation, as reported by previous studies. We suggest that understanding how the upper atmosphere responses to the geomagnetic-associated heating is important to predict space weather impacts on low earth-orbiting satellites.