A Linear Solvation Energy Relationship Study for the Reactivity of 2-(4-Substituted Phenyl)- cyclohex-1-enecarboxylic, 2-(4-Substituted Phenyl)-benzoic, and 2-(4-Substituted Phenyl)-acrylic Acids with Diazodiphenylmethane in Various Solvents J. B. NIKOLI ´ C, 1 G. S. U ˇ S ´ CUMLI ´ C, 1 I. O. JURANI ´ C 2 1 Department of Organic Chemistry, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, P.O. Box. 3505, 11120 Belgrade, Serbia 2 Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, P.O. Box. 158, 11001 Belgrade, Serbia Received 13 November 2009; revised 15 January 2010, 1 February 2010; accepted 1 February 2010 DOI 10.1002/kin.20497 Published online in Wiley InterScience (www.interscience.wiley.com). Correspondence to: J. B. Nikoli· c; e-mail: jasmina@tmf.bg.ac.rs. Contract grant sponsor: Ministry of Science and Environmental Protection, Republic of Serbia. Contract grant numbers: 142063 and 142010. c  2010 Wiley Periodicals, Inc.