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.
Identification. Formerly Bechuanaland Protectorate under the British, Botswana became independent in 1966. Bot swana means place of Tswana in the dominant national language (Set swana), and the citizenry are called Bat swana, or Tswana people.The term Batswana, however, bears a double meaning.In government rhetoric, it refers to all citizens of Botswana.wo-thirds of the country is comprised of the Kalahari Desert, which is covered with grasses and scrub but has scarce surface water. Mean annual rainfall ranges from under 10 inches (250 millimeters) per annum in the southwest to over 25 inches (635 millimeters) in the northeast.