| 摘要 |
Linear polymers the chains of which contain two to sixty units of the formula: <FORM:0959129/C2/1> in which R1 and R2 are H, methyl or ethyl are prepared by reacting at 20-250 DEG C., 1 mol. of tin tetrachloride with a compound of the formula: <FORM:0959129/C2/2> Reaction may be performed in a liquid hydrocarbon to facilitate removal of heat. The cyclic monomeric starting materials may be produced according to Specification 933,365. Suitable ones are 3,3,9,9-tetramethyl-6-stanna-spiro-[5,5]-undecan and 3,9-dimethyl-3,9-diethyl-6-stanna-spiro-[5,5]-undecane.ALSO:Linear polymers the chains of which contain two to sixty units of the formula: <FORM:0959129/C3/1> in which R1 and R2 are H, methyl or ethyl are prepared by reacting, at 20 DEG to 250 DEG C., 1 mol of tin tetrachloride with 1 to 2 mols of a 6-stanna spiro-[5,5]-undecane of the formula: <FORM:0959129/C3/2> Reaction may be performed in a liquid hydrocarbon to facilitate removal of heat. Examples describe the production of polymers from 3, 3, 9, 9-tetramethyl -6- stanna-spiro-[5,5]-undecane. 3,9-dimethyl-3,9-diethyl -6- stanna-spiro- [5,5]-undecane is also mentioned as a suitable starting material. The cyclic monomeric tin compound can be made as described in Specification 933,365. |
