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.
The pula is the currency of Botswana. It has the ISO 4217 code BWP and is subdivided into 100 thebe. Pula literally means rain in Setswana, because rain is very scarce in Botswana â home to much of the Kalahari Desert â and therefore valuable and a blessing.The sub-unit, thebe, means shield, representing defence. The names were picked with the help of the public.t has the ISO 4217 code BWP and is subdivided into 100 thebe. Pula literally means rain in Setswana, because rain is very scarce in Botswana â home to much of the Kalahari Desert â and therefore valuable and a blessing. The sub-unit, thebe, means shield, representing defence.