INDEX hydride complexes

The inner coordination spheres of these two complexes are presented in Figure 1. While the Ru-H distance is well defined in the amidinato, it is not in the triazenido complex. Yet reference to Table I indicates that the triazenido structure is better if one uses the unreliable criterion that the lower the R index, the better the structure. In this instance, the low R index in the triazenido complex results from an elaboration of the usual group refinement model (3), allowing for anisotropic motion of the group atoms. This elaboration introduces a large number of additional variables and provides us with an opportunity to lower the R index More importantly, we established that the other features of the structure were virtually unaffected by this elaboration. We conclude that with problems of this type, such an elaboration probably is not justified by the expense involved. Why can t the hydride position be located accurately in the... 

Substrates covered are listed in the index page. Most investigators have worked with the complex hydrides of boron and aluminum therefore reactions with these form the principal part of the discussion. Some work with other organometallic hydrides and complex hydrides of some transition metals is also described. 

Properties M.w. 184.31 sp.gr. 0.993-0.997 b.p. 95-97 C (13 mm Hg) ref. index 1.579 Toxicology TSCA listed Uses Reducing agent for prep, of silyl-substituted alkylidene complexes of tantalum, in ionic reduction of enones to sat. ketones, in reductive cyclization of unsat. ketones, for esters in presence of zinc hydride catalyst, for o-halo ketones in presence of Mo(0), reduction of thio esters to ethers, esters to alcohols with Rh catalysis, in assym. reduction of methyl ketones, reductive cleaving of allyl acetates Manuf./Distrib. ABCR http //www.abcr.de, Alfa Aesar http //www.aifa.com-. Digital Spec. Chems. http //www.digHaichem.com, Fluorochem USA... 

However, the adoption of novel technologies, though inherently safer, may introduce new hazards when auxiliary units are accormted. In fact the shell tube heat exchangers required by metal hydride technology in Chain 2 and 3 may origin quite easily LOCs. This is accounted for in the UHl indices. This confirms that a key issue that influences the values of the overall hazard index is the plant complexity, in terms of auxiliary equipments and secondary imits. 

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