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The Buchner ring expansion is a two-step organic C-C bond forming reaction used to access 7-membered rings. The first step involves formation of a carbene from ethyl diazoacetate , which cyclopropanates an aromatic ring.
It is commonly thought to be named after the Nobel Laureate Eduard Buchner (without umlaut), but it is actually named after the industrial chemist Ernst Büchner. [2] A Büchner funnel fitted with Sintered Disc made of Boro 3.3 Glass. Diagram of filtration set-up using a Büchner flask
cylindrical type graduated and ungraduated with cone and socket; with pressure equalizing tube; pear shaped, graduated and ungraduated; Pressure-equalizing dropping funnels have an additional narrow-bore glass tube from the bulb of the funnel, to the ground glass joint around the stem.
[4] To use a separating funnel, the two phases and the mixture to be separated in solution are added through the top with the stopcock at the bottom closed. The funnel is then closed and shaken gently by inverting the funnel multiple times; if the two solutions are mixed together too vigorously emulsions will form.
Another variation uses naphthalene flakes or similar aromatic mothballs in place of a heat source to drive organisms downward. [4] This method finds application in situations without electrical power, where the organisms are repulsed by volatile preservatives in collection container, or they cannot migrate downward quickly enough to avoid ...
The short tube and hose barb effectively act as an adapter over which the end of a thick-walled flexible hose (tubing) can be fitted to form a connection to the flask.
Carl Frederick Buechner, the eldest son of Katherine Golay (Kuhn) and Carl Frederick Buechner Sr., was born on July 11, 1926, in New York City. [8] [9] During Buechner's early childhood the family moved frequently, as Buechner's father searched for work.
Hans Buchner was a pioneer in the field of immunology. He was the first to discover a substance in blood serum that was capable of destroying bacteria. He called the substance "alexin", which was later named "complement" by Paul Ehrlich (1854–1915). [1] In 1888 he introduced the pyrogallic method for cultivation of anaerobic bacteria.