heres what dictionary.com has to say.

[From nucleus.]
Usage Note: The pronunciation (nky-lr), which is generally considered incorrect, is an example of how a familiar phonological pattern can influence an unfamiliar one. The usual pronunciation of the final two syllables of this word is (-kl-r), but this sequence of sounds is rare in English. Much more common is the similar sequence (-ky-lr), which occurs in words like particular, circular, spectacular, and in many scientific words like molecular, ocular, and vascular.