Novel Concepts in Directed Biaryl Synthesis, XVI. Synthesis and Structure of Benzonaphthopyrans; Helically Distorted, Bridged Biaryls with Different Steric Hindrance at the Axis

Autor:	Hans Georg von Schnering, Lothar Göbel, Karl Peters, Gerhard Bringmann, Thomas Hartung, O. Schupp
Rok vydání:	1992
Předmět:	Steric effects Crystallography Chemistry Stereochemistry Organic Chemistry X-ray crystallography Chemical reduction Molecule Crystal structure Nuclear magnetic resonance spectroscopy Physical and Theoretical Chemistry
Zdroj:	Liebigs Annalen der Chemie. 1992:769-775
ISSN:	1099-0690 0170-2041
Popis:	A simple two-step synthesis of a series of ether-type bridged biaryls 3, as favorable models for studies of helimerization processes, is described. Starting from the known corresponding lactones 1, a variety of differently substituted representatives 3 is prepared, greatly varying by the degree of steric hindrance and thus molecular distortion. NMR spectroscopy and especially X-ray diffraction reveal the ethers 3 to be helically distorted, depending on the size of the ortho substituents R.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c896becd87c8afaa18f762b7820c53fb https://doi.org/10.1002/jlac.1992199201127 Zobrazit plný text záznamu Plný text