Scheme 1:
Synthesis of VO(hntdtsc)(HPIP) (1), R
1
=OH, R
2
=H, R
3
=H; VO(hntdtsc)(m-HPIP) (2), R
1
= H, R
2
=OH, R
3
=H; VO(hntdtsc)(p-HPIP) (3), R
1
=H, R
2
= H, R
3
=OH.