ChemInform Abstract: Seven-Membered Ring Synthesis via Iron-Mediated Carbonylative Ring Expansion and σ-Alkyl-π-allyl Complexes

ChemInform ◽  
2010 ◽  
Vol 27 (36) ◽  
pp. no-no
Author(s):  
P. EILBRACHT ◽  
A. HIRSCHFELDER
Keyword(s):  
Ring Expansion ◽  
Membered Ring ◽  
Ring Synthesis

ChemInform Abstract: A Surprising Eight-Membered Ring Synthesis Leading To Enantiomerically Pure Tricyclic Benzodiazepine Derivatives.

ChemInform ◽  
2010 ◽  
Vol 26 (29) ◽  
pp. no-no
Author(s):  
A. HAKIKI ◽  
M. MOSSADAK ◽  
M. MOKHLES ◽  
F. ROUESSAC ◽  
H. DUDDECK ◽  
...  
Keyword(s):  
Membered Ring ◽  
Enantiomerically Pure ◽  
Benzodiazepine Derivatives ◽  
Ring Synthesis

ChemInform Abstract: PHOTOCHEMICAL RING EXPANSION OF FIVE- AND SIX-MEMBERED RING KETONES DERIVED FROM PENTOSES

1974 ◽  
Vol 5 (30) ◽  
pp. no-no
Author(s):  
P. M. COLLINS ◽  
N. N. OPARAECHE ◽  
B. R. WHITTON
Keyword(s):  
Ring Expansion ◽  
Membered Ring

scholarly journals Photochemical ring expansion reactions: synthesis of tetrahydrofuran derivatives and mechanism studies

2019 ◽  
Vol 10 (43) ◽  
pp. 10129-10134 ◽  
Author(s):  
Sripati Jana ◽  
Zhen Yang ◽  
Chao Pei ◽  
Xinfang Xu ◽  
Rene M. Koenigs
Keyword(s):  
Bond Length ◽  
Ring Expansion ◽  
Membered Ring ◽  
Reaction Proceeds

We have shown light mediated ring-expansion reactions of 4-membered ring heterocycles. The reaction proceeds via a diradical mechanism and bond length play a key role in the stereodetermining step.

Chiral Mo−Binol Complexes:  Activity, Synthesis, and Structure. Efficient Enantioselective Six-Membered Ring Synthesis through Catalytic Metathesis

1999 ◽  
Vol 121 (36) ◽  
pp. 8251-8259 ◽  
Author(s):  
S. Sherry Zhu ◽  
Dustin R. Cefalo ◽  
Daniel S. La ◽  
Jennifer Y. Jamieson ◽  
William M. Davis ◽  
...  
Keyword(s):  
Membered Ring ◽  
Ring Synthesis

The mechanism investigation of the imidazolidinone catalyzed five-membered ring synthesis reaction

2012 ◽  
Vol 26 (3) ◽  
pp. 232-239 ◽  
Author(s):  
Lili Zhang ◽  
Huiling Liu ◽  
Yuhong Yang ◽  
Zhihui Chong ◽  
Tingting Feng ◽  
...  
Keyword(s):  
Membered Ring ◽  
Synthesis Reaction ◽  
Ring Synthesis

Synthesis of Seven-Membered-Ring Ketones by Arylative Ring Expansion of Alkyne-Substituted Cyclobutanones

2005 ◽  
Vol 44 (29) ◽  
pp. 4608-4611 ◽  
Author(s):  
Takanori Matsuda ◽  
Masaomi Makino ◽  
Masahiro Murakami
Keyword(s):  
Ring Expansion ◽  
Membered Ring

Unexpected Pyrolytic Behaviour of Substituted Benzo[c]thiopyran and Thieno[2,3-c]thiopyran S,S-dioxides

2014 ◽  
Vol 67 (9) ◽  
pp. 1288 ◽  
Author(s):  
R. Alan Aitken ◽  
Clémence Hauduc ◽  
M. Selim Hossain ◽  
Emily McHale ◽  
Adrian L. Schwan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Ring Expansion ◽  
Hydrogen Atom Transfer ◽  
Membered Ring ◽  
X Ray ◽  
Flash Vacuum Pyrolysis ◽  
Vacuum Pyrolysis ◽  
Higher Temperature ◽  
Intramolecular Hydrogen ◽  
Carbonyl Products

Flash vacuum pyrolysis (FVP) of benzo[c]thiopyran S,S-dioxide (1) results in formation of indene and 2-vinylbenzaldehyde as previously described. A range of eight analogues with various substitution patterns are found to behave differently. In general, there is no extrusion of SO2 to give products analogous to indene, but unsaturated carbonyl products analogous to 2-vinylbenzaldehyde are formed in most cases by way of ring expansion to a 7-membered ring sultine, extrusion of SO, and intramolecular hydrogen atom transfer. Other processes observed include formation of anthracene via an isomeric 7-membered sultine with loss of SO, CO and methane or butane, and formation of 4-ethylidene-4,5-dihydrocyclobuta[b]thiophenes by way of SO loss, a radical rearrangement, and extrusion of acetone. The analogues with a halogen substituent at position 8 on the benzene ring require a higher temperature to react and give naphthalene resulting from net elimination of HX and SO2. The X-ray crystal structure of 1 is also reported.

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