SECONDARY DEUTERIUM ISOTOPE EFFECTS IN SOME SN1 AND E$sub 2$ REACTIONS

Journal Article · Mon Jan 01 00:00:00 EST 1962 · Croatica Chemica Acta (Yugoslavia)

OSTI ID:4806837

Asperger, S; Illakovac, N; Pavlovic, D

The reaction rate of 0.025 M solution of PhCH/sub 2/CD/sub 2/Br(I) with NaOEt (0.019 M) in anh. EtOH was measured at 59.8 deg C by extinction at 248 m mu . A k/sub H//k/sub D/ value of 1.17 was found. k/sub H//k/sub D/ = 1 was measured potentiometrically for the reaction of 0.05 M solutions of PhCH/sub 2/CD/ sub a/SMe/sub 2/Br(II) and NaOH in H/sub 2/O at 79.55 deg C. With II, about 75% D exchanged during reaction in 2 to 5 M solutions k/sub H//k/sub D/ = 1.25 was determined potentiometrically for the hydrolysis of MeCD/sub 2/C(CD/sub 3/)/sub 2/ SMe/sub 2 /I (0.05 M solution) at 59.75 deg C. The smaller isotope effects in reactions of sulfonium salts vs halides are explained by larger electron transfer in the transition state of the latter reactions. k/sub H//k/sub D/> 1 in the E/ sub 2/ reaction of I is ascribed to partial rehybridization of C-D bonds in the rate-determining step. (auth)

• Research Organization: Ruder Boskovic Inst., Zagreb and Univ. of Zagreb
• NSA Number: NSA-16-028941
• OSTI ID: 4806837
• Journal Information: Croatica Chemica Acta (Yugoslavia), Vol. Vol: 34; Other Information: Orig. Receipt Date: 31-DEC-62
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CHEMISTRY
ATOMIC MODELS
BINDING ENERGY
BROMINATED HYDROCARBONS
CHEMICAL REACTIONS
DEUTERIUM COMPOUNDS
ELECTRIC POTENTIAL
ELECTRONS
ETHANOL
HALOGENATED HYDROCARBONS
HYDROLYSIS
ISOTOPE EFFECTS
ISOTOPIC EXCHANGE
MEASURED VALUES
ORBITS
ORGANIC SULFUR COMPOUNDS
PHENYL RADICALS
QUALITATIVE ANALYSIS
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SOLUTIONS
TEMPERATURE
WATER