6840-31-9Relevant articles and documents
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Wittig,G. et al.
, p. 189 - 201 (1966)
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Chromium-catalyzed cyclopropanation of alkenes with bromoform in the presence of 2,3,5,6-tetramethyl-1,4-bis(trimethylsilyl)-1,4-dihydropyrazine
Ikeda, Hideaki,Mashima, Kazushi,Nishi, Kohei,Tsurugi, Hayato
, p. 3604 - 3609 (2020/04/21)
Chromium-catalyzed cyclopropanation of alkenes with bromoform was achieved to produce the corresponding bromocyclopropanes. In this catalytic cyclopropanation, an organosilicon reductant, 2,3,5,6-tetramethyl-1,4-bis(trimethylsilyl)-1,4-dihydropyrazine (1a
THE BEHAVIOR OF THE SINGLET AND TRIPLET SPIN STATES OF METHYLENE-BRIDGED 1,8-NAPHTHOQUINODIMETHANE WITH O2
Pagni, Richard M.,Burnett, Michael N,,Hassaneen,Hamdi M.
, p. 843 - 851 (2007/10/02)
It has been shown that thermolysis of naphthocyclopropane 8 yields the singlet 1,8-naphthoquinodimethane 7 by disrotatory ring opening.In fluid solution the singlet biradical prefers to ring close to regenerate the starting material rather than under a 1,2-hydrogen shift to yield phenalene (9).It has been demonstrated that the singlet 7 does not react with O2 or undergo intersystem crossing to ground state triplet 7.It has also been shown by an intricate set of experiments that triplet 7 is produced on photolysis of 8 and that it reacts with O2.Unfortunately, it was not possible to elucidate unequivocally the mechanism by which triplet 7 reacts with O2.
