prov:value
| - -hydrocarbylsilyl group, provided that at least one of Y1 and Y2 is one of said ???OR???, ???SR???, ???NR???, ???C(H or R???)???, or ???PR???2 radicals; Z is a bivalent atom or group having at least one chain atom which is one of a carbon, silicon, oxygen, sulphur, nitrogen or phosphorus atom, preferably 1-4 carbon and/or silicon chain atoms; each Rv is the same or different and is one of a hydrog
|