Publisher Summary This chapter discusses the chemistry of benzo[c]furan, benz-annelated and hetero-substituted derivatives, and benzo[c]-furan-4,7-diones. In a rotational and vibrational analysis of the first singlet transition of benzo[c]furan, the CNDO/S method was used to calculate the bond orders in the ground and excited state. The benzo[c]furan and its alkyl- and monoaryl-substituted derivatives are also discussed. The flash-pyrolysis technique is used for the synthesis of unstable benzo[c]furans. The chemistry of 1, 3-diarylbenzo[c]furans are reviewed focusing on several aspects—its syntheses, the Diels–Alder reactions, the higher cycloaddition reactions, the reactions with singlet oxygen, the photochemical reactions; and luminescence, electroluminescence, and lasing properties. The spectroscopic properties of benzo [c] furans are presented by considering four types of spectra, namely ultraviolet spectra (UV) spectra, 1H-NMR) spectra, mass spectra, and photoelectron spectra. The 1H-chemical shift of cyclododeceno[c]furan and cyclotetradeceno[c]furan are also calculated.

Benzo[c]furans

Literature data up to 2003 were presented and information on methods for preparing and modifying natural 4-arylcoumarins and their synthetic analogs were systematized.

Neoflavones. 2. Methods for Synthesizing and Modifying 4-Arylcoumarins

https://epublications.marquette.edu/cgi/viewcontent.cgi?article=1620&context=chem_fac

Synthesis, Electronic Properties, and X-ray Structural Characterization of Tetrarylbenzo[1,2-b:4,5-b′]difuran Cation Radicals

Current approaches to the synthesis of 4-arylcoumarins (neoflavones) are reviewed. This is an important group of O-containing natural flavonoids that are widely used not only to prepare natural and synthetic neoflavone analogs but also to design compound libraries based on 4-arylcoumarins for biological activity studies. The use of new transition-metal catalysts and unconventional activation methods for cyclization of the coumarin system, arylation of activated coumarins, and direct arylation of unactivated coumarins are discussed.

Recent Progress in the Synthesis of 4-Arylcoumarins

http://link.springer.com/content/pdf/10.1007/BF00899921.pdf

W. Limontschew

Papers

ber die Kondensation von Benzoin und Hydrochinon: 2. Mitteilung: ber einige Abbauprodukte des lin.- und ang.-Parabenzo-tetraphenyl-difurfurans