Cyclopropanediols. VII. Comportement chimique des cyclopropanediols et reactions de bis(trimethylsiloxy)-1,2 cyclopropanes

1978 ◽  
Vol 56 (4) ◽  
pp. 481-486 ◽  
Author(s):  
Raymond Le Goaller ◽  
Jean-Louis Pierre
Keyword(s):  
Ring Opening ◽  
Acid And Base ◽  
Chemical Behaviour

The chemical behaviour of 1,2-bis(trimethylsiloxy)cyclopropanes is described. Acid and base solvolyses as well as reactions with chlorine and bromine occur with opening of the ring leading to α-ketols, enones and β-diketones. Ketols and enones arise from a cyclopropanol type ring opening while the β-diketones resuit from the oxidation of the intermediate siloxycyclopropanols or cyclopropanediols. [Journal translation]

Acid and base catalyzed ring-opening polymerization of 2,2,4,4,6,6-hexamethyl-8,8-diphenylcyclotetrasiloxane

Polymer ◽  
2003 ◽  
Vol 44 (15) ◽  
pp. 4149-4155 ◽  
Author(s):  
Conan J Teng ◽  
William P Weber ◽  
Guoping Cai
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Acid And Base

Preparation of functionalized castor oil derivatives with tunable physical properties using heterogeneous acid and base catalysts

RSC Advances ◽  
2015 ◽  
Vol 5 (62) ◽  
pp. 50289-50297 ◽  
Author(s):  
Sivashunmugam Sankaranarayanan ◽  
Kannan Srinivasan
Keyword(s):  
Physical Properties ◽  
Castor Oil ◽  
Ring Opening ◽  
Heterogeneous Catalysts ◽  
Base Catalysts ◽  
Acid And Base ◽  
Oil Derivatives ◽  
Epoxidized Castor Oil

Functionalized castor oil derivatives are achieved from epoxidized castor oil through ring opening and transesterification reactions using heterogeneous catalysts.

Synthesis and acid- and base-promoted ring opening of polycarbocyclic oxiranes

Tetrahedron ◽  
1998 ◽  
Vol 54 (18) ◽  
pp. 4459-4470 ◽  
Author(s):  
Alan P Marchand ◽  
Eric Zhiming Dong ◽  
Simon G Bott
Keyword(s):  
Ring Opening ◽  
Acid And Base

ChemInform Abstract: Synthesis and Acid- and Base-Promoted Ring Opening of Polycarbocyclic Oxiranes.

ChemInform ◽  
2010 ◽  
Vol 29 (43) ◽  
pp. no-no
Author(s):  
A. P. MARCHAND ◽  
E. Z. DONG ◽  
S. G. BOTT
Keyword(s):  
Ring Opening ◽  
Acid And Base

Metal-free and regiospecific synthesis of 3-arylindoles

2020 ◽  
Vol 18 (14) ◽  
pp. 2661-2671
Author(s):  
Chuangchuang Xu ◽  
Wenlai Xie ◽  
Jiaxi Xu
Keyword(s):  
Ring Opening ◽  
High Efficiency ◽  
Metal Free ◽  
Microwave Assisted ◽  
Fischer Indolization ◽  
Acid And Base ◽  
Nucleophilic Ring Opening

A microwave-assisted acid and base co-catalyzed strategy shows high efficiency in the synthesis of 3-arylindoles through tandem nucleophilic ring-opening and Fischer indolization of aryloxiranecarbonitriles and arylhydrazine hydrochlorides.

Phosphato complexes of cobalt(III). II. Reversible chelation and ring-opening reactions

1968 ◽  
Vol 21 (1) ◽  
pp. 57 ◽  
Author(s):  
SF Lincoln ◽  
DR Stranks
Keyword(s):  
Rate Constants ◽  
Ring Opening ◽  
Base Catalysis ◽  
Ring Opening Reaction ◽  
Ring Opening Reactions ◽  
Protonated Forms ◽  
Acid And Base ◽  
Chelation Reaction ◽  
Ph Range ◽  
Monodentate Complex

The bidentate phosphato complex Co en2PO40; has been shown to exist in rapid reversible equilibrium with the monodentate complex Co en2OH.HPO40 A detailed kinetic analysis of the opposed ring-opening and ring-closing (or chelation) reactions has evaluated rate constants for each of the protonated forms in acid and basic media. The ring-opening reaction is subject to both acid and base catalysis. However, within the pH range 6-9, the bidentate form containing a four-member phosphate ring is thermodynamically more stable than the monodentate form. This is ascribed to a rapid chelation reaction arising from a favourable cis hydrogen-bonded transition state.

Ring opening, dimerisation and oligomerisation reactions of methyloxirane on solid acid and base catalysts

2004 ◽  
Vol 208 (1-2) ◽  
pp. 307-311 ◽  
Author(s):  
András Fási ◽  
István Pálinkó ◽  
Ágnes Gömöry ◽  
Imre Kiricsi
Keyword(s):  
Ring Opening ◽  
Solid Acid ◽  
Base Catalysts ◽  
Acid And Base
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