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.
Botswana, one of Africa's most stable countries, is the continent's longest continuous multi-party democracy. It is relatively free of corruption and has a good human rights record. It is also the world's largest producer of diamonds and the trade has transformed it into a middle-income nation. Botswana protects some of Africa's largest areas of wilderness. It is sparsely populated, because it is so dry.