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ESR Spectra of Some Amino Acid Derivatives of Semiquinone Anions

✍ Scribed by Frank R. Hewgill; Ulrike Höfler; Richard C. Power; Hartmut B. Stegmann

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
395 KB
Volume
34
Category
Article
ISSN
0749-1581

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✦ Synopsis

Reaction of the n-butyl esters of alanine and leucine with both tert-butyl-1,4-benzoquinone and 1,4-naphthoquinone gave the corresponding N-substituted quinones. Substitution at both C-5 and C-6 was observed with 2-tert-butyl-1,4-benzoquinone, but C-6 substitution predominated. Reduction of the latter isomers and of the naphthoquinones gave ESR spectra to which splitting constants were assigned with the help of ENDOR spectroscopy and selective deuteration.

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