Table 3. A comparison of selected structure parameters between compounds 13c and 14c ^a .

Compounds	13c	14c
O1–B1	1.524 (7)	1.498 (6)
O2–B2	1.523 (7)	1.481 (6)
O1–C41	1.308 (6)	1.366 (5)
O2–C54	1.295 (6)	1.357 (5)
C41–C54	1.458 (7)	1.370 (6)
B1–O1–C41	131.9 (4)	124.9 (3)
B2–O2–C54	134.6 (4)	125.7 (3)

^aBond lengths in Å; angles in °.