I understand from Sihler (not the most obviuos place to find it)
that the first(?) Slavic palatalisation was (*kWe, *kWi >) *ke, *ki
> c^e, c^i (before original PIE i, e), and the second(?) was (*kWoy,
*kWay >) *ki: > ci .
As far as I know, the "natural" development of palatalisation is
k > c^ > c > s^ > s. So /c/ should be more front than /c^/, but in
this case /c^/ and /c/ go together with (/e/, /i/) and (/oy/, /ay/)
respectively, of which the former is more front than the latter.
That puzzles me, how did the results of last palatalisation "pass"
the the results of the first, on their "way to the front"?
(Hope this makes sense to someone; it almost does to me).
Torsten