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Using 1 and 2 as starting compounds, we have now been able to prepare 3, a compound of type C in which the amino(imino)phosphane 1 is coordinatively bridged as four-electron donor to two rhenium atoms via the imino-N atom and the P atom.3[41 forms yellow-orange crystals which are sensitive to hydrolysis, readily soluble in benzene, moderately soluble in ether, and sparingly soluble in pentane.The crystal structure analysis[51 shows (Fig. I) that trans-1 isomerizes to cis-1 through the p-q',q'-coordination of the P=N moiety of the molecule. In the process the NPN angle widens from 104.9"[21 to 122.6", while the PN bond lengths remain almost unchanged. [Z 456 IE] German version: Angew. Chem. 95 (1983) 1003 Angew. Chem. Znr. Ed. Engl. 22 (1983) No. I 2 0 Verlug Chemie GmbH.

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