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Zakazana broń

100%

Dworniczak M.

Wiedza i Życie

2015

nr 03

Dwa oblicza nikotyny

75%

Dworniczak M.

Wiedza i Życie

2015

nr 02

Kinetics and Mechanism of the reaction Between 2,3,5,6-Tetrabromo-1,4-benzoquinone and Tetramethylguanidine in Benzene

63%

Dworniczak M. , Jarczewski A.

Polish Journal of Chemistry

1999

tom Vol. 73, nr 10

1739-1744

The reaction of bromanil (2,3,5,6-tetrabromobenzoquinone)with 1,1,3,3-tetramethylguanidine in benzene has been studied spectrophotometrically. The reaction proceeds according to the mechanism of vinylic substitution with a charge-transfer complex as the intermediate compound. the final product is a disubstituted quinone. The reaction mechanism is discussed.

Anion Radical Formation in the Reaction of 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) with Tribenzylamine in Acetonitrile

63%

Dworniczak M. , Jarczewski A.

Polish Journal of Chemistry

2001

tom Vol. 75, nr 11

1739-1743

Kinetics of the reaction of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) with tribenzylamine in acetonitrile has been measured spectrophotometrically. The product of this reaction is a stable anion radical of DDQ. The reaction is relatively slow, due to a considerable steric hindrance in both quinone and amine molecule. Activation parameters indicate a charge separation in the transition state. The mechanism of the reaction has been proposed.

Kinetics of the reaction of 2,3,5,6-tetrachloro-1,4-benzoquinone with imidazole in acetonitrile and benzene

51%

Dworniczak M. , Przybyszewska M. , Jarczewski A.

Polish Journal of Chemistry

1998

tom Vol. 72, nr 1

108-112

Nucleophilic vinylic substitution of 2,3,5,6-tetrachloro-1,4-benzoquinone by imidazole in acetonitrile and benzene has been studied spectrophotometrically. The reaction product is the diaminodichlorosubstituted quinone. The values of the activation parameters indicate that there is a considerable charge separation in the transition state. The reaction mechanism is discussed.