A mild, convenient protocol for the synthesis of cis-aziridines employs a catalytic amount of Brnsted acid. Diazo compound decomposition via alkylation or homocoupling upon exposure to a proton source is slow relative to [2 + 1] annulation in the presence of a Schiff base. A. L. Williams, J. N. Johnston, J. Am. Chem.
The tropical savanna is a biome characterized by tall grasses and occasional trees. Large regions of tropical savanna extend through the nations of Botswana, Namibia, and Kenya in Africa, southern Brazil, India, and Australia. Surprisingly, the Everglades of southern Florida in North America is also a tropical savanna. Photo  2000-www.arttoday.com.
Worldwide zones of Tropical savanna climate (Aw/As). Tropical savanna climate or tropical wet and dry climate is a type of climate that corresponds to the KÃ¶ppen climate classification categories Aw and As. Tropical savanna climates have monthly mean temperatures above 18 Â°C in every month of the year and typically a pronounced dry season, with the driest month having precipitation less than 60 mm and also less than 100 â [total annual precipitation {mm}/25] of precipitation.â1 This latter fact is in direct contrast to a tropical ...