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Chemical reaction
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
Buchner_ring_expansion
Chemical phenomenon within ring systems
ring expansion is the Buchner ring expansion. The Buchner ring expansion is used to convert arenes to cycloheptatrienes. The Buchner ring expansion is
Ring expansion and contraction
Ring_expansion_and_contraction
German chemist (1860–1917)
Eduard Buchner (German: [ˈeːduaʁt ˈbuːxnɐ] ; 20 May 1860 – 13 August 1917) was a German chemist and expert on fermentation (sometimes called a zymologist)
Eduard_Buchner
Organic reaction
cyclopentanone with diazomethane forms cyclohexanone (shown below). The Büchner ring expansion reactions utilizing diazoalkanes have proven to be synthetically
Büchner–Curtius–Schlotterbeck reaction
Büchner–Curtius–Schlotterbeck_reaction
Chemical compound
dichlorocarbene. A related classic synthesis for cycloheptatriene derivatives, the Buchner ring enlargement, starts with the reaction of benzene with ethyl diazoacetate
Cycloheptatriene
Chemical reaction
classic example of transition metal-assisted dearomatization is the Buchner ring expansion. Catalytic asymmetric dearomatization reactions (CADA) are used
Dearomatization_reaction
Chemical group (>C=N=N)
to cyclopropanes. In the Buchner ring expansion, diazo compounds react with aromatic rings with ring-expansion. The Buchner-Curtius-Schlotterbeck reaction
Diazo
Chemical process which generates cyclopropane rings
then be used to form allenes via the Skattebøl rearrangement. The Buchner ring expansion reaction also involves the formation of a stabilised carbene. Cyclopropanation
Cyclopropanation
Chemical reaction which adds a –CH2– group to a molecule
product undergoes further electrocyclic ring opening to give cycloheptatriene products (Buchner ring expansion). Alkenes undergo both C=C methylenation
Methylenation
Chemical reaction
[1][2][3] It involves substitution by a hydroxyl group with a possible ring expansion. It is named after the Russian chemist Nikolai Jakovlevich Demjanov
Demjanov_rearrangement
Double-walled insulated storage vessel
can rupture due to the differential in thermal expansion between the outer and inner walls. Expansion joints are commonly used in tubular vacuum flasks
Vacuum_flask
Narrow-necked container
Watch glass Flasks Büchner Vacuum (Dewar) Erlenmeyer Fernbach Fleaker Florence Retort Round-bottom Schlenk Volumetric Funnels Büchner Hirsch Dropping Separatory
Bottle
Vacuum insulated container
Watch glass Flasks Büchner Vacuum (Dewar) Erlenmeyer Fernbach Fleaker Florence Retort Round-bottom Schlenk Volumetric Funnels Büchner Hirsch Dropping Separatory
Cryogenic_storage_dewar
Laboratory apparatus
Watch glass Flasks Büchner Vacuum (Dewar) Erlenmeyer Fernbach Fleaker Florence Retort Round-bottom Schlenk Volumetric Funnels Büchner Hirsch Dropping Separatory
Soxhlet_extractor
Device to measure temperature
Measurement- Part 2: Expansion thermometers. Section 2.1 Guide to selection and use of liquid-in-glass thermometers E.F.J. Ring (January 2007). "The historical
Thermometer
Laboratory storage container
Watch glass Flasks Büchner Vacuum (Dewar) Erlenmeyer Fernbach Fleaker Florence Retort Round-bottom Schlenk Volumetric Funnels Büchner Hirsch Dropping Separatory
Reagent_bottle
Type of ejector-jet pump
Watch glass Flasks Büchner Vacuum (Dewar) Erlenmeyer Fernbach Fleaker Florence Retort Round-bottom Schlenk Volumetric Funnels Büchner Hirsch Dropping Separatory
Vacuum_ejector
Brush for cleaning test tubes and narrow glassware
Watch glass Flasks Büchner Vacuum (Dewar) Erlenmeyer Fernbach Fleaker Florence Retort Round-bottom Schlenk Volumetric Funnels Büchner Hirsch Dropping Separatory
Test_tube_brush
Type of local ventilation device
Watch glass Flasks Büchner Vacuum (Dewar) Erlenmeyer Fernbach Fleaker Florence Retort Round-bottom Schlenk Volumetric Funnels Büchner Hirsch Dropping Separatory
Fume_hood
Ruling family of the Franks (c. 481–751)
Medieval Europe. Great Britain: Oxford University Press. p. 88. Beyerle & Buchner 1954. Rouche 1987, p. 423. Wallace-Hadrill, J.M. (1983). "V. The Merovingian
Merovingian_dynasty
Variety of equipment usually made of glass used for scientific experiments
boron oxide and silica, its main feature is a low coefficient of thermal expansion making it more resistant to thermal shock than most other glasses. Quartz
Laboratory_glassware
carbazole synthesis Bucherer reaction Bucherer–Bergs reaction Buchner ring enlargement Büchner–Curtius–Schlotterbeck reaction Buchwald–Hartwig amination Bunnett
List_of_organic_reactions
Glass or plastic laboratory glassware
usually made of glass, for its relative resistance to heat. Tubes made from expansion-resistant glasses, mostly borosilicate glass or fused quartz, can withstand
Test_tube
Laboratory apparatus used to determine melting point
Watch glass Flasks Büchner Vacuum (Dewar) Erlenmeyer Fernbach Fleaker Florence Retort Round-bottom Schlenk Volumetric Funnels Büchner Hirsch Dropping Separatory
Thiele_tube
Device used to protect the wearer's face from hazards
Watch glass Flasks Büchner Vacuum (Dewar) Erlenmeyer Fernbach Fleaker Florence Retort Round-bottom Schlenk Volumetric Funnels Büchner Hirsch Dropping Separatory
Face_shield
1365-2966.2011.19954.x. S2CID 119188037. Wolf, J.; Nandra, K.; Salvato, M.; Buchner, J.; Onoue, M.; Liu, T.; Merloni, A.; Ciroi, S.; Di Mille, F.; Arcodia
List_of_galaxies
Dies: 'The Thing' & 'Punky Brewster' Actor Was 69". January 10, 2026. Buchner, Chris (March 1, 2026). "TED NICHOLS DEAD AT 97". Saturday Mornings Forever
2026_in_American_television
Chancellor of Germany from 1998 to 2005
nickname "Audi Man", a reference to the four-ring symbol of Audi motorcars. Another nickname is "The Lord of the Rings". Schröder married for the fifth time
Gerhard_Schröder
Iron Age site in Bavaria, Germany
for the boundaries of parishes or bishoprics. The schoolteacher J.A. Buchner (1776–1854) wrote an initial description of Manching in 1831, under the
Oppidum_of_Manching
Process of achieving a goal by overcoming obstacles
Perspective. Hillsdale, N.J.: Lawrence Erlbaum Associates. pp. 65–99. Buchner, A. (1995). "Theories of complex problem solving". In Frensch, P.A.; Funke
Problem_solving
Last pre-Islamic Iranian empire (224–651 AD)
Zoroastrian calendar Iranica Online - Ctesiphon. Daryaee (2008), pp. 99–100. Büchner, V.F. (2014) [1913-1936]. "Sāsānians". Encyclopaedia of Islam First Edition
Sasanian_Empire
Used in laboratories to easily assemble apparatus from parts
the nut to be used to separate the joint. Laboratory glassware, such as Buchner flasks and Liebig condensers, may have tubular glass tips intended for
Ground_glass_joint
with an Export Achievement Award in 2007 for its ongoing international expansion. A number of competitors manufacture PC, handheld, and calculator-based
MeasureNet_Technology_Ltd.
Ceramic material
ware, such as reaction vessels, combustion boats, evaporating dishes and Büchner funnels. Raw materials for the body include kaolin, quartz, feldspar, calcined
Porcelain
Arguments against the economic system of capitalism
and national sovereignty. At the same time, it incentivises imperialist expansion and war and benefits a small minority at the expense of the majority of
Criticism_of_capitalism
Play by Sarah Kane
that she based the structure of Cleansed on the play Woyzeck by Georg Büchner. She also directed a production of Woyzeck at the Gate Theatre, Notting
Cleansed
institutionalized church or sacerdotal cult. In 1881 in Frankfurt am Main, Ludwig Büchner established the German Freethinkers League (Deutscher Freidenkerbund) as
Religion_in_Nazi_Germany
Capital of Bavaria, Germany
excavations at Marienhof Square (near Marienplatz) in advance of the expansion of the S-Bahn (subway) in 2012 discovered shards of vessels from the 11th
Munich
examples – based on works by Maeterlinck, Oscar Wilde, Těsnohlídek, and Büchner. This trend arrived in the United States only in the 1970s and reached
Opera_in_the_United_States
American ceramic manufacturing company
succeeded by Ken Holiman. Coors bought ACI in 1976, mostly for the seal ring specialty ACI had developed, and eventually moved most of its alumina and
CoorsTek
Archived from the original on 10 August 2017. Retrieved 10 August 2017. Buchner, Chris. “Lancelot Link, Secret Chimp”. Saturday Mornings Forever. 8 August
List of Paramount Skydance television programs
List_of_Paramount_Skydance_television_programs
Quarter of the Neukölln borough in Berlin, Germany
("Rixdorfian peasants' polka"), a semi-instrumental version arranged by Max Büchner (1862–1906) with an accompanying comedic skit written by Martin Bendix
Neukölln_(locality)
Mammalian protein found in humans
2005. PMC 549381. PMID 15713654. Bell S, Klein C, Müller L, Hansen S, Buchner J (October 2002). "p53 contains large unstructured regions in its native
P53
German literary and cultural movement, whose practitioners established a new humanism
widely in many magazines and journals, profoundly directed the subsequent expansion of German-speaking and European culture. The inability of this common-sense
Weimar_Classicism
Series of compositions by Karlheinz Stockhausen
2016. [Klavierstück XIII, on CD 4, recorded 20 July 1984, at the Georg-Büchner-Schule, Darmstadt] Wambach, Bernhard (piano). Karlheinz Stockhausen: Klavierstücke
Klavierstücke_(Stockhausen)
Town in Hesse, Germany
in Dudenhofen with grade levels 11 to 13. There are the Georg-Büchner-Schule in Jügesheim and the Geschwister-Scholl-Schule in Hainhausen, both
Rodgau
Decade
Mariano José de Larra, Spanish author, suicide (b. 1809) February 19 – Georg Büchner, German playwright, typhus (b. 1813) February 23 – Friedrich Ludwig Weidig
1830s
History of the football program from 2007 to 2023
at South Florida. Coach Saban rotated quarterbacks Ty Simpson and Tyler Buchner in a very sloppy 17–3 win over the Bulls. The following week saw the return
Alabama Crimson Tide football under Nick Saban
Alabama_Crimson_Tide_football_under_Nick_Saban
for many generations, and created permanent markers in the form of tipi rings and medicine wheels. The first Europeans to build in Alberta were the fur
List of oldest buildings in Canada
List_of_oldest_buildings_in_Canada
German symbolist poet and translator
('Days and Works'; cf. Hesiod's Works and Days) 1907: Der siebente Ring ('The Seventh Ring') 1913: Der Stern des Bundes ('The Star of the Covenant') 1917:
Stefan_George
Tragedy of a Simple Man [de] (Woyzeck), 2013 – the story of Woyzeck by Georg Büchner transferred into modern Berlin-Wedding district. Woyzeck is exploited by
List_of_films_set_in_Berlin
Month of 1925
Ethiopia. The Alban Berg opera Wozzeck, based on the incomplete Georg Büchner play Woyzeck, was premiered by the Berlin State Opera. Born: Helen O'Brien
December_1925
BUCHNER RING-EXPANSION
BUCHNER RING-EXPANSION
Surname or Lastname
English
English : occupational name for a butcher or slaughterer, Middle English bo(u)cher (Old French bouchier, a derivative of bouc ‘ram’).
Boy/Male
English American
King. King's field. Title used as a surname by the members of a royal household. Famous...
Surname or Lastname
English
English : occupational name for a maker of buckles, Middle English bokeler, Old French bouclier (see Buckle).Americanized spelling of German Büchler (see Buechler).
Surname or Lastname
English, German, and Dutch
English, German, and Dutch : metonymic occupational name for a maker of rings (from Middle English ring, Middle High German rinc, Middle Dutch ring), either to be worn as jewelry or as component parts of chain-mail, harnesses, and other objects. In part it may also have arisen as a nickname for a wearer of a ring.Scandinavian : from ring ‘ring’, probably an ornamental name but possibly applied in the same sense as 3 or 1.German : topographic name from Middle High German, Middle Low German rink, rinc ‘circle’.Irish (eastern County Cork) : reduced Anglicized form of Gaelic Ó Rinn (see Reen).
Boy/Male
English
Butcher.
Surname or Lastname
English
English : habitational name from places named Wing in Buckinghamshire and Rutland. The former was probably named in Old English as the settlement of the Wiwingas ‘the family or followers of a man named Wiwa’, or alternatively perhaps ‘the people of the temple’ (from a derivative of Old English wīg, wēoh ‘(pre-Christian) temple’). The latter is from Old Norse vengi, a derivative of vangr ‘field’. Compare Wang.Dutch (van Wing) : variant of Winge.Chinese : variant of Rong 2.
Female
Japanese
(凛) Japanese name RIN means "cold, dignified, severe."Â
Boy/Male
Arabic
King; Leader; Fire
Surname or Lastname
English
English : variant spelling of Butcher.German : topographic name for someone who lived by a beech tree or beech wood, from Middle High German buoche ‘beech tree’ + the suffix -er denoting an inhabitant.German : habitational name for someone from any of numerous places called Buch.French (Bûcher) : occupational name for a logger or woodsman, from a derivative of buche ‘log’.One of the earliest immigrants of the Bucher family came from Würzenhaus, Switzerland, to Philadelphia in 1735.
Boy/Male
Australian, British, English, French, German, Japanese
Ring; Apple; Peace be with You
Boy/Male
English
Ring.
Surname or Lastname
English and Scottish
English and Scottish : nickname from Middle English king, Old English cyning ‘king’ (originally merely a tribal leader, from Old English cyn(n) ‘tribe’, ‘race’ + the Germanic suffix -ing). The word was already used as a byname before the Norman Conquest, and the nickname was common in the Middle Ages, being used to refer to someone who conducted himself in a kingly manner, or one who had played the part of a king in a pageant, or one who had won the title in a tournament. In other cases it may actually have referred to someone who served in the king’s household. The American surname has absorbed several European cognates and equivalents with the same meaning, for example German König (see Koenig), Swiss German Küng, French Leroy. It is also found as an Ashkenazic Jewish surname, of ornamental origin.Chinese : variant of Jin 1.Chinese : , , , , Jing.
Male
Hebrew
Variant spelling of Hebrew unisex Rinnah, RINA means "shouting for joy."Â Compare with strictly feminine forms of Rina.
Boy/Male
British, English
Ring
Female
Hebrew
 Variant spelling of Hebrew unisex Rinnah, RINA means "shouting for joy." Compare with other forms of Rina.
Surname or Lastname
English and German
English and German : variant of Ring 1.Perhaps a Rhenish short form of the Latin personal name Quirinus.
Boy/Male
Hindu
King
Surname or Lastname
English (mainly East Anglia)
English (mainly East Anglia) : habitational name from Lyng in Norfolk, so named from Old English hlinc ‘hillside’, or from either of two places in Norfolk and Lincolnshire named Ling, from Old Norse lyng ‘ling’, ‘heather’. There is also a Lyng in Somerset, so named from Old English lengen ‘long place’.German : variant of Link.Chinese : from a word meaning ‘ice’. In ancient times, the imperial palace was able to enjoy ice in the summer by storing winter ice in a cellar, entrusting its care to an official called the iceman. This post was once filled during the Zhou dynasty (1122–221 bc) by a descendant of Kang Shu, the eighth son of Wen Wang, who had been granted the state of Wei soon after the establishment of the Zhou dynasty. Descendants of this particular iceman adopted the word for ice, ling, as their surname.
Male
English
English name derived from the vocabulary word, "king," from Old English cyning, probably KING means "family, race."
Surname or Lastname
English
English : of uncertain derivation; probably a topographic name for someone living near a bing, a northern dialect word recorded with the senses ‘heap’, ‘bin’, ‘receptacle’ (probably from Old Norse bingr ‘stall’).Jewish (western Ashkenazic) and Danish : habitational name from Bing, a shortened form of Bingen.Danish : metonymic occupational name, from bing ‘storage bin for grain’, for someone who either made or used such containers.
BUCHNER RING-EXPANSION
BUCHNER RING-EXPANSION
Girl/Female
French American Latin English
Bright.
Girl/Female
Muslim/Islamic
Friendship
Boy/Male
Tamil
Dyumani | தயà¯à®®à®¾à®¨à¯€
Lord Shiva
Boy/Male
Sikh
Who lives in heart
Boy/Male
Indian, Punjabi, Sikh
Life Full of Divine Knowledge
Girl/Female
Arabic, Muslim
Rose Peddle
Girl/Female
Muslim
Princess
Boy/Male
British, English
From the Watchman Meadow
Boy/Male
Indian
Small Child; Good Friends; Good Words
Boy/Male
Indian
Love for the Moon
BUCHNER RING-EXPANSION
BUCHNER RING-EXPANSION
BUCHNER RING-EXPANSION
BUCHNER RING-EXPANSION
BUCHNER RING-EXPANSION
p. p.
of Ring
v. t.
To cause to sound or ring.
a.
Shaped like a bat's wing; as, a bat's-wing burner.
a.
Having a head like a buckler.
n.
A sound; especially, the sound of vibrating metals; as, the ring of a bell.
n.
See Rind.
v. t.
To make a ring around by cutting away the bark; to girdle; as, to ring branches or roots.
v. t.
To kill or slaughter (animals) for food, or for market; as, to butcher hogs.
v. i.
To sound or ring, as a bell; to tinkle.
v. t.
To surround with a ring, or as with a ring; to encircle.
n.
A kind of half boot, named from the Prussian general Blucher.
v. t.
To fit with a ring or with rings, as the fingers, or a swine's snout.
v. t.
To cause to sound, especially by striking, as a metallic body; as, to ring a bell.
v. i.
To sound, as a bell; to ring; to clang.
imp.
of Ring