Hydrazinolysis of the pentacarbonyl[alkyl- or aryl-(methoxy)carbene] complexes of W0 and Cr0 with both 1,1- and 1,2-disubstituted hydrazines affords the corresponding new hydrazinocarbenes, and the presence of LiCl in the reaction medium greatly increases their yields. Thus, reaction of (OC)5W:C(OMe)Me with R2NNH2 (R2N = piperidino, morpholino, trans-2,6-dimethylmorpholino, 4-methylpiperazino) in THF gave 6-34% of the corresponding R2NNHC(Me):W(CO)5 as Z rotamers. In presence of LiCl, morpholinohydrazine afforded 72% R2NNHC(Me):W(CO)5, double the yield obtained without added LiCl.
Hydrazinolysis of Fischer-type oxacarbenes made efficient: a new and easy entry to alkyl and aryl hydrazinocarbene complexes / E. Licandro, S. Maiorana, A. Papagni, D. Perdicchia, R. Manzotti. - In: CHEMICAL COMMUNICATIONS. - ISSN 1359-7345. - :10(1999), pp. 925-926.
Hydrazinolysis of Fischer-type oxacarbenes made efficient: a new and easy entry to alkyl and aryl hydrazinocarbene complexes
E. Licandro;S. Maiorana;D. Perdicchia;
1999
Abstract
Hydrazinolysis of the pentacarbonyl[alkyl- or aryl-(methoxy)carbene] complexes of W0 and Cr0 with both 1,1- and 1,2-disubstituted hydrazines affords the corresponding new hydrazinocarbenes, and the presence of LiCl in the reaction medium greatly increases their yields. Thus, reaction of (OC)5W:C(OMe)Me with R2NNH2 (R2N = piperidino, morpholino, trans-2,6-dimethylmorpholino, 4-methylpiperazino) in THF gave 6-34% of the corresponding R2NNHC(Me):W(CO)5 as Z rotamers. In presence of LiCl, morpholinohydrazine afforded 72% R2NNHC(Me):W(CO)5, double the yield obtained without added LiCl.
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