A new ring enlargement reaction of γ-lactones to seven-membered cyclic ethers via intramolecular endo-mode cyclisation of the ω-hydroxy allenyl ketone intermediates in situ

1996 ◽  
pp. 19-20 ◽  
Author(s):  
Yoshimitsu Nagao ◽  
Ill-Yun Jeong ◽  
Woo Song Lee ◽  
Shigeki Sano
Keyword(s):  
Cyclic Ethers ◽  
Ring Enlargement

scholarly journals Ring Enlargement of Three‐Membered Heterocycles by Treatment with In Situ Formed Tricyanomethane

2020 ◽  
Vol 26 (28) ◽  
pp. 6158-6164
Author(s):  
Klaus Banert ◽  
Madhu Chityala ◽  
Marcus Korb
Keyword(s):  
Ring Enlargement

scholarly journals Stereoselective Synthesis of 5-7 membered Cyclic Ethers by Deiodonative Ring-Enlargement Using Hypervalent Iodine Reagents

Molecules ◽  
2005 ◽  
Vol 10 (1) ◽  
pp. 183-189 ◽  
Author(s):  
Tomohito Abo ◽  
Masanori Sawaguchi ◽  
Hisanori Senboku ◽  
Shoji Hara
Keyword(s):  
Stereoselective Synthesis ◽  
Hypervalent Iodine ◽  
Cyclic Ethers ◽  
Ring Enlargement

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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