Regioselectivity in lithium, sodium and potassium chloroallyl systems. An Ab initio-theoretical and experimental study
Abstract The computed structural and electronic features of the title compounds describe the sodium and potassium systems as more inclined to CCl 2 regioselectivity with carbonyl electrophiles than the analogous lithium compounds. Some experimental results confirm this expectation.
For many years it has been assumed that nonradiative recombination plays a dominant role in determining the high temperature performance of long wavelength laser diodes. We show that this view is inconsistent with the measured temperature dependence of spontaneous emission from light emitting diodes. We conclude that net gain primarily determines the temperature sensitivity of threshold in long wavelength semiconductor lasers.