Tetrachlorocyclopropene, Tetrabromocyclopropene, and Some Fluorinated Cyclopropenes and Cyclopropanes¹

Abstract

nmr spectrum of 4 shows a sharp singlet resonance at 76.2 ((-OCHsls); a doublet at 5.20 J = 1.2 cps (-CH(OR)z); and a doublet at 3.31, J -1.2 cps (C=C-H). The peak area ratios are 6:0.9:1.

Catalysis of CC-coupling reactions by cyclopropenylidene palladium complexes

“…General comments: Tetrachlorocyclopropene [10] and the diarylcyclopropenones [11] were prepared according to literature. All experiments were carried out under dry argon using standard Schlenk or dry box techniques.…”

Allylic Reactions of Benzocyclopropenes. Discrimination of halogen substituents in 1, 1‐Dihalogenobenzocyclopropenes

“…Analytical samples were by preparative GC. The physical and spectral data are reported elsewhere [15]. I , 6,7-Trichloro-7-fluoro-2,5-diphenylbicyclo[4.1.O]hept-3-ene (13).…”

Synthesis of naturally occurring tropones and tropolones

“…281 This reaction was first discovered by Tobey and West in the 1960s 282–283 and later investigated by Wright’s group for the synthesis of substituted cycloheptadienes. 284–290 After the Diels-Alder cycloaddition, a sequence of rearrangement, hydrolysis in the presence of silver salts, addition of isopropyl zinc cuprate to enone and reduction by samarium diiodide yielded the tropolone natural product.…”