Process of preparation of novel rhodium hydrogenation catalysts

Details Process of preparation of novel rhodium hydrogenation catalysts Process of preparation of novel rhodium hydrogenation catalysts

1987-05-15

1989-08-15

Hollrah, Glennon H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

556 21, C07C10319, C07F 1500

Patent

active

048572357

ABSTRACT:
The present invention refers to complexes prepared by reacting rhodium trinitrate with a suitable hydrazine and a suitable tertiary phosphine, more specifically to the compounds di(.mu.-hydrazine-N.sup.1 :N.sup.2)-bis[bis(triphenylphosphine)rhodium (I)]dinitrate and .mu.-3-carbopentazane-N.sup.1,N.sup.4 :N.sup.2,N.sup.5 -bis[bis(triphenylphosphine)rhodium (I)]dinitrate, which are homogeneous hydrogenation catalysts and their application in the hydrogenation of the exocyclic methylene group of acid addition salts of 6-demethyl-6-deoxy-6-methylene-5-hydroxytetracycline (methacycline) to prepare .alpha.-6-deoxy-5-hydroxy-tetracycline (doxycycline).

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patent: 4743699 (1988-05-01), Page et al.

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