High N Values Without Available Electron-pairs

5 High N Values Without Available Electron-pairs 

It has become customary to speak of these high N values for carbon as electron-deficient, a characteristic found in most boranes and carboranes59) whereas other N values (as found in PFS and SF6) are called hyper-valent. This obedience to the Lewis paradigm reminds one about meteorological weather predictions, to which the speaker adds that a considerable amplitude of hyperthermic and hypothermic deviations are expected, as well as xeric and hydrophilic anomalies. 

The situation surrounding N — 6 in M(C5H5)2 and M(CJH5)2 is far more confusing from a group-theoretical point of view because 3 and 5 have no common prime-factor (and actually both are prime-numbers). A major reason for this ackward 

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