prov:value
| - R5 is a single- or multimembered bridge which links the radicals R3 and R4 and is ##STR6## ???BR6, ???AlR6, --Ge--, --Sn, --O--, --S--, ???SO, ???SO2, ???NR6, ???CO, ???PR6 or ???P(O)R6, where R6, R7 and R8 are identical or different and are a hydrogen atom, a halogen atom; preferably chlorine, a C1 -C10 -, preferably C1 -C3 -alkyl group, in particular methyl group, a C1 -C10 -fluoroalkyl group, p
|