Browsing Τμήμα Χημείας / Department of Chemistry by Author "Orfanopoulos, Michael"
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[4 + 2] Cycloadditions of rigid s-cis dienes to C60. A synchronous Diels-Alder reaction
Chronakis, Nikos; Orfanopoulos, Michael (2001)(Matrix presented) The Diels-Alder reaction of rigid s-cis dienes with C60 occurs by a concerted mechanism, via a symmetrical transition state.
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Addition of Electron-Rich Aromatics to Azafullerenium Carbocation. A Stepwise Electrophilic Substitution Mechanism
Vougioukalakis, G. C.; Chronakis, Nikos; Orfanopoulos, Michael (2003)(Matrix presented) The reaction between the C59N+ carbocation and the electron-rich aromatic compounds toluene and anisole has been mechanistically studied. The measured intermolecular kinetic isotope effects are consistent ...
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Application and evaluation of solvent-free matrix-assisted laser desorption/ionization mass spectrometry for the analysis of derivatized fullerenes
Hungerbühler, H.; Kotsiris, Sotirios G.; Vasil'ev, Y. V.; Streletskii, A. V.; Hart, M.; Mark, L. P.; Boltalina, O. V.; Chronakis, Nikos; Orfanopoulos, Michael; Drewello, T. (2006)A variety of derivatized fullerenes have been studied by matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. Of particular emphasis has been the evaluation of a recently introduced solvent-free sample/target ...
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Concerted Diels-Alder reaction between anthracene and C60
Chronakis, Nikos; Orfanopoulos, Michael (2001)The Diels-Alder reaction of anthracene with C60 has been investigated experimentally by using secondary isotope effects. The inverse α-secondary isotope effect in conjunction with the unity value of the β-secondary isotope ...
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Ene Reaction of Arylallyl Alkenes with C60. A Mechanistic Approach
Chronakis, Nikos; Orfanopoulos, Michael (1999)(Matrix Presented) The ene reaction of arylallyl alkenes with C60 occurs either by a concerted mechanism or by the reversible formation of a charged or a dipolar intermediate, followed by the C-H(D) breakage in a rate-limiting ...
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A new [2 + 2] functionalization of C60 with alkyl-substituted 1,3- butadienes: A mechanistic approach. Stereochemistry and isotope effects
Vassilikogiannakis, G.; Chronakis, Nikos; Orfanopoulos, Michael (1998)The stereochemistry and secondary isotope effects of the [2 + 2] photocycloaddition of trans,trans- (7), cis,cis- (8), and cis,trans-2,4- hexadiene (9), 2,5-dimethyl-2,4-hexadiene (1), and its deuterated analogues 1-d1, ...
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Stereochemistry of the [4 + 2] cycloadditions of trans,trans- and cis,trans-2,4-hexadiene to C60
Chronakis, Nikos; Froudakis, G.; Orfanopoulos, Michael (2002)The [4 + 2] cycloaddition of trans,trans-2,4-hexadiene with C60 proceeds via a concerted mechanism with retention of stereochemistry in the cycloadduct 1a. However, when cis,trans-2,4-hexadiene reacts with C60, isomerization ...
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Article
Synthesis and self-photooxygenation of alkenyl-linked [60]fullerene derivatives. A regioselective ene reaction
Chronakis, Nikos; Vougioukalakis, G. C.; Orfanopoulos, Michael (2002)(equation presented) Alkenyl-linked C60 derivatives undergo self-photooxygenation regioselectively, by the preferential abstraction of allylic hydrogens on the fullerene side of the double bond.