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Titolo:
A NEW APPROACH TO THE SYNTHESIS OF 1,4,7, 10-TETRAAZACYCLODODECANE
Autore:
WEI JF; ZHUO RX; YAN GP; DU P;
Indirizzi:
WUHAN UNIV,DEPT CHEM WUHAN 430072 PEOPLES R CHINA WUHAN UNIV,DEPT CHEM WUHAN 430072 PEOPLES R CHINA
Titolo Testata:
Gaodeng xuexiao huaxue xuebao
fascicolo: 4, volume: 18, anno: 1997,
pagine: 658 - 660
SICI:
0251-0790(1997)18:4<658:ANATTS>2.0.ZU;2-X
Fonte:
ISI
Lingua:
CHI
Keywords:
SYNTHESIS; POLYAZACYCLOALKYL COMPOUND; 1,4,7,10-TETRAAZACYCLODODECANE; CYCLIC CONDENSATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
8
Recensione:
Indirizzi per estratti:
Citazione:
J.F. Wei et al., "A NEW APPROACH TO THE SYNTHESIS OF 1,4,7, 10-TETRAAZACYCLODODECANE", Gaodeng xuexiao huaxue xuebao, 18(4), 1997, pp. 658-660

Abstract

A new and simplified method for synthesis 1,4,7,10-tetraazacyclododecane (cyclen) has been proposed by two steps in this paper, The first step deals with cyclic condensation of triethylenetetramine and diethyloxalate in methanolic solution, giving the twelve-numbered cyclic oxamide, i. e., 1,4,7,10-tetraazacyclododecane-2,3-dione, The pure product was obtained as a crystalline precipitate in 39% yield on addition of ethanol to the concentrated solution of the reaction mixture, Subsequently, in the second step, the cyclic oxamide was reduced in THF withdiborane produced in situ from potassium borohydride and boron trifluoride etherate and extracted by CH2Cl2 from the basic aqueous solutionof the solvent free residue, giving cyclen in 56% yield after removing the solvent.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 16:31:00