An ARENIUM ION in organic chemistry is a cyclohexadienyl cation that appears as a reactive intermediate in electrophilic aromatic substitution . For historic reasons this complex is also called a WHELAND INTERMEDIATE or a SIGMA COMPLEX or σ-COMPLEX. The smallest arenium ion is the BENZENIUM ION (C6H7+), which is protonated benzene .
Two hydrogen atoms bonded to one carbon lie in a plane perpendicular to the benzene ring. The arenium ion is no longer an aromatic species; however it is relatively stable due to delocalization: the positive charge is delocalized over 3 carbon atoms via the pi system , as depicted on the following resonance structures :
A complexed electrophile can contribute to the stability of arenium ions.
A benzenium ion can be isolated as a stable compound when benzene is
protonated by the carborane superacid H(CB11H(CH3)5Br6). The
benzenium salt is crystalline with thermal stability up to 150 °C.
Bond lengths deduced from
In one study a methylene arenium ion is stabilized by metal complexation:
In this reaction sequence the R-Pd(II)-Br starting complex 1
TMEDA is converted by dppe to metal complex 2.
Electrophilic attack of methyl triflate forms methylene arenium ion 3
with (based on
* List of publications in chemistry: Jerry March Advanced Organic Chemistry * Aryl radical
* ^ Stable carbocations. CXVIII. General concept and structure of carbocations based on differentiation of trivalent (classical) carbenium ions from three-center bound penta- of tetracoordinated (nonclassical) carbonium ions. Role of carbocations in electrophilic reactions George A. Olah J. Am. Chem. Soc. ; 1972; 94(3) pp 808 - 820; doi :10.1021/ja00758a020 * ^ A Quantum Mechanical Investigation of the Orientation of Substituents in Aromatic Molecules G. W. Wheland J. Am. Chem. Soc. ; 1942; 64(4) pp 900 - 908; doi :10.1021/ja01256a047 * ^ A guidebook to mechanism in organic chemistry, Peter Sykes ; pp 130-133 * ^ Isolating Benzenium Ion Salts Christopher A. Reed, Kee-Chan Kim, Evgenii S. Stoyanov, Daniel Stasko, Fook S. Tham, Leonard J. Mueller, and Peter D. W. Boyd J. Am. Chem. Soc. ; 2003; 125(7) pp 1796 - 1804; doi :10.1021/ja027336o * ^ Synthesis and Reactivity of the Methylene Arenium Form of a Benzyl Cation, Stabilized by Complexation Elena Poverenov, Gregory Leitus, and David Milstein J. Am. Chem. Soc. ; 2006; 128(51) pp 16450 - 16451; (Communication) doi :10.1021/