ChemInform Abstract: PERFLUORINATED DERIVATIVES OF FURAN VIA NOVEL CYCLIZATION REACTIONS OF PERFLUORO-OLEFINS

1978 ◽  
Vol 9 (34) ◽  
Author(s):  
R. D. CHAMBERS ◽  
A. A. LINDLEY ◽  
P. D. PHILPOT ◽  
H. C. FIELDING ◽  
J. HUTCHINSON ◽  
...  
Keyword(s):  
Cyclization Reactions ◽  
Derivatives Of

ChemInform Abstract: A Study of the Intramolecular Cyclization Reactions of Some Derivatives of 3-Arylsulfonyl Cycloalkanols.

ChemInform ◽  
2010 ◽  
Vol 28 (3) ◽  
pp. no-no
Author(s):  
S. S. GONZALES ◽  
H. K. JACOBS ◽  
L. E. JUARROS ◽  
A. S. GOPALAN
Keyword(s):  
Intramolecular Cyclization ◽  
Cyclization Reactions ◽  
Derivatives Of

Substituent effects on the electronic structure of the flat Blatter radical: Correlation analysis of experimental and computational data

2021 ◽  
Author(s):  
Piotr Kaszynski ◽  
Paulina Bartos ◽  
Aniket A. Hande ◽  
Anna Pietrzak ◽  
Anna CHROSTOWSKA
Keyword(s):  
Electronic Structure ◽  
Correlation Analysis ◽  
Functional Group ◽  
Substituent Effects ◽  
Cyclization Reactions ◽  
Computational Data ◽  
Derivatives Of

A series of C(10)–substituted derivatives of the 2-Ph-3H-[1,2,4]triazino[5,6,1-kl]phenoxazin-3-yl was obtained using the aza-Pschorr, photochemical and radical–induced cyclization reactions, and through functional group transformations of the C(10)–amino and C(10)–iodo derivatives. The...

Kinetics and mechanism of base-catalyzed cyclization of substituted amides and nitriles of hydantoic acid

1987 ◽  
Vol 52 (1) ◽  
pp. 140-155 ◽  
Author(s):  
Vladimír Macháček ◽  
Gabriela Svobodová ◽  
Vojeslav Štěrba
Keyword(s):  
Rate Constant ◽  
Acid Amide ◽  
Phenyl Group ◽  
Reaction Rate Constant ◽  
Amide Group ◽  
Cyclization Reaction ◽  
Hydrolysis Rate ◽  
Cyclization Reactions ◽  
Hydrolysis Of ◽  
Derivatives Of

Rates of base-catalyzed cyclizations of 8 substituted derivatives of hydantoic acid amide type R3-NH(5)-CO(4)-NR2(3)-CH2(2)-CO(1)-NHR1 and 9 nitriles type R3-NH(5)-CO(4)-NR2(3)-CHR1(2)-CN have been measured in aqueous and methanolic media. The cyclization of the amides in aqueous medium is also accompanied by hydrolysis of the hydantoins formed. In some cases the hydrolysis rate constant is greater than the corresponding cyclization reaction rate constant. With the least reactive amides, the cyclization is also accompanied by hydrolysis of the amide group. The rate of the cyclization reactions in water is higher than that in methanol (at the same concentration of the lyate ions) by the factor of 10-100. Substitution of hydrogen at 3 and 5 positions by methyl or phenyl groups causes an acceleration of the cyclization reaction, whereas a substitution in the amide group causes a considerable retardation. The greatest acceleration of the cyclization (by as much as 4 orders) is caused by introduction of phenyl group to the N(5) position, which is due to a substantial increase of concentration of the reactive anion.

Sign in / Sign up

Export Citation Format

Share Document