Table 4. Selected NMR data of the compounds 17 ^a .

Compound	17a	17b	17c
R	Ph	Mes	t Bu
31P	1.3	1.7	15.0
11B	–13.6	–8.1	–13.9
C1	27.7	31.6	21.5
C2	125.2	128.3	124.7
C3	132.1	128.4	131.1
C4	21.7	19.5	27.3
1-H	2.98	3.98/2.71	2.38
3-H	6.09	5.46	5.78
4-H	2.13	2.23/1.71	2.03
19F (o)	–129.2	–125.5/–127.4/–128.6/–131.5	–124.0/–125.5/–129.8/–132.1
19F (p)	–159.3	–158.0/–160.9	–157.4/–160.7
19F (m)	–165.0	–164.7 (2F)/–165.2/–165.8	–163.0/–163.8/–164.0/–165.0

^aIn CD₂Cl₂, chemical shifts in ppm, δ-scale.