ChemInform Abstract: REACTIONS OF CARBENES WITH CONJUGATED DI‐ AND POLYENE COMPOUNDS. IX. REACTION N OF DIHALOCARBENES WITH NUCLEAR‐SUBSTITUTED STYRENES

Abstract

Relative Geschwindigkeitskonstanten der Additionen von Dihalogencarbenen an die Styrole (I) werden bestimmt.

Reaction of Halogenated Cyclopropanes and Nitrosyl Cation: Preparation of Isoxazoles

“…1 H NMR and 13 C NMR spectra were recorded at 250 MHz and at 62.86 MHz, respectively, at an ambient temperature withdeuteriochloroform as the solvent. 1-Aryl-2,2-dichlorocyclopropanes were prepared by treating styrene derivatives with CHCl 3 in pentane in the presence of KOBu t as described in the literature procedures …”

Fluorinated Carbenes

“…Relative rate constants for the addition of bromofluorocarbene to a series of arylethenes 370 and substituted styrenes 308 have been reported. The carbene was generated under standard two-phase conditions (50% NaOH, triethylbenzylammonium chloride (TE-BAC), or dibenzo [18]crown-6) in the presence of alkene (eq 77).…”

“…Kostikov et al determined the relative reactivities of chlorofluorocarbene addition to a series of substituted styrenes . Yields ranged from 15 to 40% with a predominance of the syn-Cl isomer in all cases except for α-methylstyrene, in which case the addition was nonstereospecific, and β-methylstyrene, in which a preference for the anti isomer was found.…”

Autocatalytic degradation of white phosphorus with silylenes

“…A frontier orbital model for the carbene reactivity has been addressed to the olefinic 1.2-addition. [31][32][33] Accordingly, carbene reactivity has a dual property; a carbene is simultaneously nucleophilic and electrophilic. 33 For P 4 addition, the situation for the addition reactions is more complicated.…”