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.
Nelspruit is situated next to Kruger, South Africa's most popular park. This region is, in fact, the main wildlife area of the country, so the town's climate is hugely representative of a lot of the parks including the private reserves in Sabi Sands and other areas surrounding Kruger. The parks in KwaZulu Natal have similar temperatures, but tend to get more rainfall in summer. Kgalagadi in the north-west of the country is a desert area with high temperatures and very little rainfall. South Africa has a lovely temperate climate with plenty of sunny, dry days. The main factors influencing conditions are altitude and the surrounding oceans.