2,5-Dihydro-1H-1,2,4-triazol-2-yl radicals: Syntheses and properties
摘要:
A range of 2,5-dihydro-1H-1,2,4-triazol-2-yl radicals 2b-p has been prepared by dehydrogenation of the corresponding 4,5-dihydro-1H-1,2,4-triazoles 5b-p which have been synthesized using various methods. EPR, ENDOR and NMR studies have led to a complete analysis and full assignment of all hyperfine coupling constants. The pi-SOMO, having a node at the C(3) methine carbon, is mainly confined to the nitrogens of the five-membered ring, particularly to those of the hydrazyl moiety.
Fusco,R.; Dalla Croce,P., Gazzetta Chimica Italiana, 1969, vol. 99, p. 69 - 85
作者:Fusco,R.、Dalla Croce,P.
DOI:——
日期:——
Combined Formose/Transfer Hydrogenation Process for Ethylene Glycol Synthesis
申请人:Grubbs Robert H.
公开号:US20100305368A1
公开(公告)日:2010-12-02
The present invention provides a process for the production of a glycol via tandem self condensation of formaldehyde via formoin condensation and transfer hydrogenation of the reaction products of the formoin condensation. In some aspects, synthetic processes of the present invention utilize a combination of a N-heterocyclic carbene catalyst and a transition metal hydrogen-transfer catalyst providing enhanced selectivity and increased yields for the production of ethylene glycol relative to conventional synthetic approaches based on formoin condensation.
2,5-Dihydro-1H-1,2,4-triazol-2-yl radicals: Syntheses and properties
作者:Franz A. Neugebauer、Hans Fischer
DOI:10.1016/0040-4020(95)00730-v
日期:1995.11
A range of 2,5-dihydro-1H-1,2,4-triazol-2-yl radicals 2b-p has been prepared by dehydrogenation of the corresponding 4,5-dihydro-1H-1,2,4-triazoles 5b-p which have been synthesized using various methods. EPR, ENDOR and NMR studies have led to a complete analysis and full assignment of all hyperfine coupling constants. The pi-SOMO, having a node at the C(3) methine carbon, is mainly confined to the nitrogens of the five-membered ring, particularly to those of the hydrazyl moiety.
Perronnet,J.; Girault,P., Bulletin de la Societe Chimique de France, 1973, p. 2843 - 2847