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vide infya), the comparison of rates was made by using kobs for only the initial stage of the reaction when little or no exchange of ligands had taken place. A typical curve used for the calculation of initial kobs is given in TABLE 1 * Rates for hydrogenation (200 lb/sq. in. H2) of methyl sorbate (0.21 1 mole/l) with R1(CH=CH)2R2*Fe(CO), (0.011 mole/l), at 165" Complexed diene 1 05kOb, Reaction No. R1 Re (sec.-l) Me Ac 13.4

The spectra of eighteen cymantrene derivatives are reported and discussed. Fragmentation patterns are suggested and substantiated by the use of metastable peaks wherever such have been observed. The presence of the metal atom in many of the fragment ions observed appears to play an important role in determining stability and subsequent fragmentation paths of these ions. This is illustrated by the observation of several intramolecular rearrangements, involving the metal atom.

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7‐Amino‐cephalosporansäure‐tert.‐butylester (I) reagiert mit Iminiumchloriden (II) zu den Amidinen (III), die durch Trifluoressigsäure gespalten und mit Triäthylamin in die Salze (IV) übergeführt werden.