relation: http://publicatio.bibl.u-szeged.hu/31957/
title: Ring-chain tautomerism and crystal structure of some 1,3-oxazacyclanes, and the electrophilic substituent constants for some heteroaryl groups in solution and in the gas-phase
creator:  Fülöp Ferenc
creator:  Sillanpää Reijo
creator:  Dahlqvist Martti
creator:  Pihlaja Kalevi
creator:  Vainiotalo Pirjo
subject: 01.04. Kémiai tudományok
subject: 03.01. Általános orvostudomány
description: In principle, the ring-chain tautomeric ratios of a number of 2-heteroaryl-substituted oxazolidines and tetrahydro-1,3-oxazines are well suited for determination of the Hammett-Brown sigma+ constants of heteroaryl substituents such as 2-furyl, 3-furyl, 3-thienyl and 2-pyrrolyl in CDCl3 solution and in the gas phase. However, a number of factors, and especially hydrogen-bonding, can change the monomeric character of either the ring or the chain form (or both), leading to deviations from the ideal sigma+ values. X-Ray analysis has demonstrated the chain structures of the products of the reactions of L-(-)-norpseudoephedrine and (+/-)-trans-2-aminomethylcyclohexanol with pyrrole-2-carboxaldehyde.
date: 1994
type: Folyóiratcikk
type: PeerReviewed
format: text
identifier: http://publicatio.bibl.u-szeged.hu/31957/1/aok_klny_32_94.pdf
identifier:     Fülöp Ferenc;  Sillanpää Reijo;  Dahlqvist Martti;  Pihlaja Kalevi;  Vainiotalo Pirjo: Ring-chain tautomerism and crystal structure of some 1,3-oxazacyclanes, and the electrophilic substituent constants for some heteroaryl groups in solution and in the gas-phase.   HETEROCYCLES, 37 (2).  pp. 1093-1107.  ISSN 0385-5414 (1994)     
identifier: doi:10.3987/com-93-s121
relation: https://doi.org/10.3987/com-93-s121
relation: 1015658
language: eng