Fluorophosphoranes: a new synthesis. Diequatorial four-membered ring in a difluorophosphorane

1972 ◽  
pp. 272 ◽  
Author(s):  
Norman J. De'Ath ◽  
Dorothy Z. Denney ◽  
Donald B. Denney
Keyword(s):  
Membered Ring ◽  
New Synthesis

A New Synthesis of Sulfur-, Nitrogen- and Oxygen-Containing Eight-Membered Ring Lactams

2009 ◽  
Vol 2009 (31) ◽  
pp. 5431-5436 ◽  
Author(s):  
Rebekka Pflantz ◽  
Jonas Sluiter ◽  
Mario Krička ◽  
Wolfgang Saak ◽  
Christoph Hoenke ◽  
...  
Keyword(s):  
Membered Ring ◽  
New Synthesis

The Chemistry of 5-Oxodihydroisoxazoles. XVI. A New Synthesis of Pyrroles, Furans, Thiophens and Their Benzo Analogues

1996 ◽  
Vol 49 (12) ◽  
pp. 1315 ◽  
Author(s):  
RH Prager ◽  
CM Williams
Keyword(s):  
Membered Ring ◽  
Ring Systems ◽  
New Synthesis

Ethyl 5-oxo-2-phenyl-2,5-dihydroisoxazole-4-carboxylate (2) was photolysed at 300 nm in the presence of phenols, enols, anilines, enamines , aryl thiols and thioenols affording enamines. Treatment of these enamines with Lewis or protic acids gives the respective benzo and five- membered ring systems.

ChemInform Abstract: A New Synthesis of Sulfur-, Nitrogen- and Oxygen-Containing Eight-Membered Ring Lactams.

ChemInform ◽  
2010 ◽  
Vol 41 (9) ◽  
Author(s):  
Rebekka Pflantz ◽  
Jonas Sluiter ◽  
Mario Kricka ◽  
Wolfgang Saak ◽  
Christoph Hoenke ◽  
...  
Keyword(s):  
Membered Ring ◽  
New Synthesis

Tandem Carbon-Radical Peroxidation−Addition to Carbonyl Groups Reaction. A New Synthesis of Steroidal β-Peroxy Lactones

1996 ◽  
Vol 61 (26) ◽  
pp. 9635-9635
Author(s):  
Alicia Boto ◽  
Rosendo Hernández ◽  
Ernesto Suárez ◽  
Carmen Betancor ◽  
María S. Rodríguez
Keyword(s):  
Carbonyl Groups ◽  
New Synthesis

1,3-Selenaphospholes: A New Synthesis from 1,2,3-Selenadiazoles and Kinetically Stabilized Phosphaalkynes1

Synlett ◽  
1991 ◽  
Vol 1991 (04) ◽  
pp. 356-358 ◽  
Author(s):  
Bernd Burkhart ◽  
Steffen Krill ◽  
Yoshinori Okano ◽  
Wataru Ando ◽  
Manfred Regitz
Keyword(s):  
New Synthesis

A New Synthesis and Analysis of Silica Nanowire Periodically Wrapped by Nano-spheres

2016 ◽  
Vol 31 (5) ◽  
pp. 523
Author(s):  
MA Hong-Bing ◽  
BAI Hua ◽  
XUE Chen ◽  
TAO Peng-Fei ◽  
XU Qun-Feng ◽  
...  
Keyword(s):  
New Synthesis

An Alternate Energy-Conserved Pathway for the Morita-Baylis-Hillman (MBH) Reaction

2020 ◽  
Author(s):  
Veejendra Yadav
Keyword(s):  
Proton Transfer ◽  
Transition State ◽  
Lower Energy ◽  
Aldol Reaction ◽  
Membered Ring ◽  
Ammonium Ion ◽  
Alternate Energy ◽  
Ring Transition State ◽  
Mbh Reaction

An new overall lower energy pathway for the amine-catalysed Morita-Baylis-Hillman reaction is proposed from computations at the M06-2X/6-311++G(d,p) level. The pathway involves proton-transfer from the ammonium ion to the alkoxide formed from the aldol reaction through a seven-membered ring transition state (TS) structure followed by highly exothermic Hofmann<i> </i>elimination through a five-membered ring TS structure to form the product and also release the catalyst to carry on with the process all over again.

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