1.
Chem Commun (Camb)
; (22): 2559-61, 2008 Jun 14.
Artículo
en Inglés
| MEDLINE
| ID: mdl-18506243
RESUMEN
The use of manganese(III) acetate in combination with copper(II) triflate allows the synthesis of [3.3.0]-bicyclic gamma-lactones from 4-pentenylmalonates in excellent yields.
Asunto(s)
Compuestos Bicíclicos Heterocíclicos con Puentes/síntesis química , Lactonas/síntesis química , Acetatos/química , Compuestos Bicíclicos Heterocíclicos con Puentes/química , Cobre/química , Ciclización , Ciclopentanos/síntesis química , Ciclopentanos/química , Radicales Libres/química , Lactonas/química , Malonatos/química , Mesilatos/química , Estructura Molecular , Compuestos Organometálicos/química , Oxidación-Reducción
2.
Org Lett
; 8(7): 1279-82, 2006 Mar 30.
Artículo
en Inglés
| MEDLINE
| ID: mdl-16562871
RESUMEN
[reaction: see text] Tetrazoles frequently replace carboxylic acids in pharmaceutical drugs. However, while the binding modes of tetrazolate and carboxylate anions in amidinium complexes turns out to be similar, the association constant of the former is 2-3 orders of magnitude smaller in DMSO. Crystal structures revealed that the N...H-N hydrogen bonds in amidinium tetrazolates are bent (162 degrees and 169 degrees ) and noticeably longer (N...N 2.96 A) than corresponding hydrogen bonds in both amidinium carboxylates and ammonium tetrazolates.