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.
Where is Botswana. Situated in the heart of the Kalahari Desert, Botswana is a landlocked country in the central part of southern Africa. More than 80% of the country is defined by the Kalahari Sand deposit, but despite this Botswana boasts the pristine wetlands of the Okavango Delta, the Linyanti swamp and the Chobe River.